7Affordable and Clean Energy

SDG 7: Affordable and Clean Energy — Research Keywords

Research keywords that map publications to SDG 7 (Affordable and Clean Energy), from the Sustainability Research Mapping 2023 lists.

20 golden 100 in the Top 100 997 in the Top 1,000

Golden list

Golden keywords

Keywords that identify this goal on their own. A superscript marks other goals that share the keyword.

access to electricity^{1, 17}ecodesign⁹eco-design^{9, 12}energy access¹⁷energy building¹²energy efficiency of building¹²energy efficiency of buildings¹²green buildings¹²green roof¹²green roofs^{11, 12}iso 26262^{9, 12}nearly zero energy building¹²net zero energy¹²passive house¹²renewable energy consumption^{8, 13, 17}rural electrification¹⁷solar desalination⁶wind energy potential¹⁷zero energy building¹²zero energy buildings¹²

Top 100

Top 100 keywords

The 100 most relevant keywords for this goal, by rank.

1photocatalytic hydrogen
2polymer solar cell
3sodium-ion batteries
4sulfur batteries
5direct methanol fuel cell
6lithium-ion batteries (libs)
7(pemfc)
8heterojunction solar cell
9polymer solar cells
10perovskite solar cells (pscs)
11air batteries
12h2 evolution
13lithium-sulfur
14microbial fuel cells
15lithium storage
16dye-sensitized solar cells (dsscs)
17short-circuit current density
18catalytic hydrogen evolution
19photovoltaic properties
20proton exchange membrane fuel cells
21generator (dfig)
22heterojunction solar cells
23solid oxide fuel cell (sofc)
24charging stations
25fuel cell application
26offshore wind farm
27vehicle charging
28bioethanol production
29biomass gasification
30doubly fed induction generator
31power conversion efficiencies
32ev charging
33hvdc system
34thin film solar cells
35solar cell application
36wind generation
37dmfc
38solar photovoltaic (pv)
39wave energy converter
40high voltage direct current
41dye sensitized
42wind generator
43plug-in hybrid
44polymer electrolyte membrane fuel cell
45organic photovoltaics
46ethanol fuel cells
47photovoltaic modules
48electric vehicle charging
49pemfcs
50lithium-sulfur batteries
51thin-film solar
52photovoltaic (pv) systems
53initial discharge capacity
54dye sensitized solar cell
55air battery
56fuel cell performance
57thin-film solar cell
58high energy efficiency
59polymer electrolyte fuel cell
60si solar cell
61li-ion batteries
62battery anode
63high reversible capacity
64unconventional reservoir
65photovoltaics
66renewable energy generation
67photovoltaic panels
68fast pyrolysis
69fuel cell applications
70shale reservoir
71cathode catalyst
72permanent magnet synchronous generator
73conventional reservoirs
74offshore wind turbines
75improve energy efficiency
76fill factor (ff)
77hybrid vehicles
78hydrogen storage material
79photocatalytic h2
80wind power plant
81parabolic trough
82fuel cell stack
83solar power plant
84renewable energy sources (res)
85phev
86proton exchange membrane fuel cell (pemfc)
87photocatalytic hydrogen evolution
88energy building
89methanol fuel cells
90pv panels
91solid oxide fuel cells (sofcs)
92use of renewable energy
93wind turbine blades
94solar cell performance
95hybrid solar
96energy crops
97crystalline silicon solar cell
98gas diffusion layer
99biomass fuel
100lithium ion batteries

Top 1,000

Top 1,000 keywords

Rank, keyword and its metrics in Scopus.

997 keywords shown

Rank	Keyword	Papers in the SDG set	Papers in all of Scopus	tf-idf	% of Scopus
1	polymer solar cells (pscs)	1,984	2,029	19.05	98%
2	lithium–sulfur	1,653	1,688	19.03	98%
3	lithium ion batteries (libs)	2,182	2,253	19.03	97%
4	bulk heterojunction solar cells	2,111	2,181	19.03	97%
5	sodium-ion batteries (sibs)	2,343	2,427	19.03	97%
6	photocatalytic h2 evolution	2,195	2,275	19.02	96%
7	bulk heterojunction solar cell	2,394	2,483	19.02	96%
8	organic solar cells (oscs)	3,259	3,350	19.02	97%
9	short-circuit current density (jsc)	2,128	2,215	19.02	96%
10	it-sofc	2,049	2,136	19.01	96%
11	sodium-ion battery	2,307	2,409	19.01	96%
12	lithium-ion battery anode	1,690	1,748	19.01	97%
13	electrocatalytic hydrogen evolution	1,680	1,740	19.01	97%
14	membrane electrode assembly (mea)	1,910	1,993	19.01	96%
15	anode-supported	2,068	2,164	19.01	96%
16	lithium polysulfide	2,435	2,552	19	95%
17	lithium polysulfides	1,841	1,925	19	96%
18	dye-sensitized solar cells	2,196	2,307	19	95%
19	hydrogen storage properties	2,559	2,686	19	95%
20	na-ion batteries	2,382	2,505	19	95%
21	photocatalytic h2 production	1,461	1,506	19	97%
22	proton exchange membrane fuel cells (pemfcs)	1,912	2,007	19	95%
23	lithium–sulfur batteries	1,293	1,316	19	98%
24	planar perovskite solar cell	1,348	1,379	18.99	98%
25	sodium ion batteries	3,110	3,247	18.99	96%
26	anode-support	2,103	2,215	18.99	95%
27	intermediate temperature solid oxide fuel cell	1,615	1,682	18.99	96%
28	lithium-sulfur battery	2,002	2,111	18.99	95%
29	high voltage direct current (hvdc)	2,532	2,673	18.99	95%
30	photovoltaic performances	1,780	1,870	18.99	95%
31	hybrid electric vehicle (hev)	2,197	2,323	18.99	95%
32	sulfur cathode	2,305	2,439	18.99	95%
33	intermediate temperature solid oxide	1,640	1,719	18.98	95%
34	dye-sensitized solar cells (dscs)	1,408	1,457	18.98	97%
35	lithium-sulfur (li-s) batteries	1,595	1,670	18.98	96%
36	li-s batteries	3,351	3,504	18.98	96%
37	pc71bm	2,890	3,052	18.98	95%
38	organic photovoltaic device	1,930	2,046	18.98	94%
39	photocatalytic hydrogen production	3,436	3,595	18.98	96%
40	fuel cell (fc)	1,701	1,794	18.98	95%
41	dye-sensitized solar cell (dssc)	2,049	2,178	18.98	94%
42	cigs solar cell	1,743	1,843	18.97	95%
43	membrane electrode assembly	3,393	3,560	18.97	95%
44	photovoltaic (pv) panel	2,059	2,194	18.97	94%
45	direct methanol fuel cell (dmfc)	1,964	2,091	18.97	94%
46	nonfullerene	1,541	1,619	18.97	95%
47	planar perovskite solar cells	1,220	1,250	18.97	98%
48	energyplus	3,293	3,468	18.97	95%
49	wind turbine (wt)	1,828	1,942	18.97	94%
50	fullerene acceptors	1,943	2,069	18.97	94%
51	penetration of renewable energy	2,862	3,041	18.97	94%
52	spiro-ometad	1,699	1,800	18.97	94%
53	polymer electrolyte membrane fuel cells	2,731	2,910	18.97	94%
54	zn-air	2,229	2,384	18.97	93%
55	metal-air batteries	2,197	2,351	18.96	93%
56	al-air batteries	2,319	2,482	18.96	93%
57	organic photovoltaic devices	1,680	1,782	18.96	94%
58	electrolyte membrane fuel cells	2,803	2,988	18.96	94%
59	zn-air batteries	1,414	1,480	18.96	96%
61	hydrogen evolution rate	2,008	2,149	18.96	93%
62	halide perovskite solar cells	1,602	1,696	18.96	94%
63	hydrogen storage capacity	2,993	3,185	18.96	94%
64	photovoltaic (pv) modules	1,861	1,988	18.96	94%
65	hybrid electric vehicles (hevs)	1,662	1,765	18.96	94%
66	wind power output	1,542	1,629	18.96	95%
67	photovoltaic inverter	1,960	2,098	18.96	93%
68	sulfur host	1,291	1,340	18.96	96%
69	membrane electrode assemblies	1,378	1,441	18.96	96%
70	vehicle-to-grid (v2g)	1,750	1,866	18.96	94%
71	phevs	2,072	2,223	18.96	93%
72	biodiesel yield	2,208	2,371	18.96	93%
73	solar cell devices	2,102	2,257	18.96	93%
74	gas diffusion layer (gdl)	1,756	1,876	18.96	94%
75	wave energy converter (wec)	1,257	1,304	18.95	96%
76	catalytic h2 production	1,514	1,602	18.95	95%
77	hybrid solar cell	1,995	2,144	18.95	93%
78	photovoltaic (pv) module	3,135	3,341	18.95	94%
79	floating offshore wind turbine	1,583	1,683	18.95	94%
80	lithium ion batteries	3,995	4,174	18.95	96%
81	li-s battery	1,469	1,553	18.95	95%
82	mfc performance	1,752	1,877	18.95	93%
83	floating offshore wind	1,822	1,957	18.95	93%
84	wave energy converters	2,508	2,704	18.95	93%
85	floating wind turbine	1,674	1,791	18.95	93%
86	catalytic hydrogen evolution reaction	1,242	1,292	18.95	96%
87	lithium sulfur	1,508	1,602	18.95	94%
88	hybrid solar cells	1,643	1,757	18.95	94%
89	wind turbine model	1,847	1,988	18.95	93%
90	bulk-heterojunction	2,375	2,566	18.95	93%
91	plug-in electric vehicles	2,350	2,541	18.94	92%
92	zn-air battery	1,399	1,478	18.94	95%
93	c-si solar cell	1,399	1,478	18.94	95%
94	solid oxide fuel cells (sofcs)	4,138	4,325	18.94	96%
95	microbial fuel cells (mfcs)	2,853	3,071	18.94	93%
96	ptb7	1,922	2,075	18.94	93%
97	fuel cell hybrid	2,000	2,162	18.94	93%
98	photocatalytic hydrogen evolution	4,177	4,363	18.94	96%
99	polymer electrolyte fuel cells	2,751	2,967	18.94	93%
100	vehicle-to-grid	2,911	3,132	18.94	93%
101	wind power penetration	1,527	1,628	18.94	94%
102	intermediate temperature solid oxide fuel cells	1,181	1,224	18.94	96%
103	fuel cell hydrogen	1,477	1,571	18.94	94%
104	proton exchange membrane fuel cell (pemfc)	4,219	4,408	18.94	96%
105	renewable energy consumption	2,452	2,658	18.94	92%
106	plug-in hybrid electric vehicles	2,416	2,622	18.94	92%
107	lithium-ion battery	1,417	1,505	18.94	94%
108	photovoltaic (pv) generation	1,367	1,447	18.94	94%
109	fc stack	2,955	3,190	18.93	93%
110	microbial fuel cell (mfc)	3,103	3,341	18.93	93%
111	sodium ion battery	1,226	1,283	18.93	96%
112	solar cell device	3,101	3,341	18.93	93%
113	photovoltaic parameter	1,642	1,770	18.93	93%
114	distributed photovoltaic	1,524	1,634	18.93	93%
115	cigs solar cells	1,277	1,345	18.93	95%
116	anode lithium	1,417	1,510	18.93	94%
117	it-sofcs	1,153	1,199	18.93	96%
118	initial coulombic efficiency	2,024	2,205	18.93	92%
119	short circuit current density (jsc)	1,166	1,215	18.93	96%
120	renewable energy power	1,764	1,914	18.93	92%
121	silicon heterojunction solar cell	1,187	1,241	18.93	96%
122	dmfcs	1,834	1,994	18.93	92%
123	photovoltaic (pv) power	3,360	3,611	18.93	93%
124	sofc anode	1,205	1,263	18.93	95%
125	organic photovoltaic (opv)	1,332	1,414	18.93	94%
126	plug-in electric vehicle	2,923	3,171	18.93	92%
127	zero energy building	2,216	2,421	18.93	92%
128	photovoltaic parameters	1,576	1,700	18.93	93%
129	hybrid photovoltaic	1,958	2,136	18.92	92%
130	fuel cell model	1,404	1,500	18.92	94%
131	methanol steam reforming	1,183	1,239	18.92	95%
132	vsc-hvdc	2,677	2,920	18.92	92%
133	hydrogen storage alloy	2,619	2,860	18.92	92%
134	vehicle to grid	1,369	1,463	18.92	94%
135	edge localized mode	1,427	1,532	18.92	93%
136	renewable energy sources (ress)	1,711	1,863	18.92	92%
137	wind energy conversion system (wecs)	1,842	2,013	18.92	92%
138	lithium storage performance	1,520	1,644	18.92	92%
139	photovoltaic thermal	1,586	1,721	18.92	92%
140	lithium-ion battery (lib)	1,288	1,371	18.91	94%
141	wind power integration	1,725	1,883	18.91	92%
142	intermittent renewable energy	1,679	1,830	18.91	92%
143	proton exchange membrane (pem) fuel cell	1,973	2,166	18.91	91%
144	open circuit voltage (voc)	2,659	2,915	18.91	91%
145	asdex upgrade	1,839	2,015	18.91	91%
146	cathode catalyst layer	1,166	1,226	18.91	95%
147	dye sensitized solar cells	3,574	3,850	18.91	93%
148	non-fullerene	2,537	2,788	18.91	91%
149	anode support	1,281	1,365	18.91	94%
150	mw wind turbine	2,403	2,644	18.91	91%
151	pv power generation	1,599	1,741	18.91	92%
152	concentrated solar power (csp)	1,465	1,584	18.91	92%
153	fullerene acceptor	3,032	3,310	18.91	92%
154	high-performance anode	2,119	2,334	18.91	91%
155	short circuit current density	3,457	3,740	18.91	92%
156	high sulfur loading	1,030	1,064	18.91	97%
157	li ion batteries	1,172	1,236	18.91	95%
158	integrated photovoltaic	2,876	3,151	18.91	91%
159	hybrid powertrain	1,552	1,688	18.91	92%
160	grid-connected photovoltaic	3,126	3,410	18.91	92%
161	shuttle effect	3,179	3,464	18.91	92%
162	solar fuel	3,077	3,360	18.91	92%
163	photovoltaic (pv) array	1,782	1,956	18.91	91%
164	hydrogen storage materials	2,944	3,224	18.91	91%
165	high-voltage direct current	1,820	2,001	18.91	91%
166	sofc stack	1,295	1,386	18.91	93%
167	li-ion batteries (libs)	1,125	1,182	18.9	95%
168	bioenergy crop	2,046	2,259	18.9	91%
169	wind farm	3,596	3,889	18.9	92%
170	non-fullerene acceptor	1,660	1,819	18.9	91%
171	battery anodes	2,173	2,403	18.9	90%
172	variable speed wind turbine	1,815	1,999	18.9	91%
173	sulfur battery	3,335	3,632	18.9	92%
174	hydrogen storage	2,159	2,389	18.9	90%
175	wind power forecast	2,357	2,608	18.9	90%
176	organic photovoltaic cell	1,829	2,017	18.9	91%
177	electromobility	1,919	2,120	18.9	91%
178	the maximum power point tracking	2,266	2,509	18.9	90%
179	monopile	2,105	2,331	18.9	90%
180	plug-in electric vehicles (pevs)	1,136	1,199	18.9	95%
181	hydrogen evolution activity	1,052	1,097	18.9	96%
182	catalytic hydrogen production	3,776	4,074	18.9	93%
183	photovoltaic (pv) panels	1,337	1,442	18.9	93%
184	biofuel cell	2,843	3,133	18.9	91%
185	plug-in hybrid electric vehicle	3,665	3,969	18.9	92%
186	nonfullerene acceptor	1,028	1,069	18.9	96%
187	wind power generation system	1,765	1,947	18.9	91%
188	concentrated solar power	3,528	3,837	18.9	92%
189	doubly-fed induction generator (dfig)	2,069	2,296	18.9	90%
190	building integrated photovoltaic	1,500	1,639	18.89	92%
191	fuel cell operation	1,414	1,537	18.89	92%
192	direct methanol fuel cells	3,960	4,263	18.89	93%
193	perovskite photovoltaic	1,443	1,573	18.89	92%
194	renewable energy integration	1,756	1,941	18.89	90%
195	parabolic trough collector	2,009	2,231	18.89	90%
196	n719	1,712	1,890	18.89	91%
197	solar photovoltaic (pv) system	1,231	1,319	18.89	93%
199	solar-to-hydrogen	1,153	1,225	18.89	94%
200	polymer donor	1,477	1,615	18.89	91%
201	tandem solar cells	2,580	2,864	18.89	90%
202	renewable energy (re)	2,144	2,386	18.89	90%
203	li-ion batteries	4,578	4,853	18.89	94%
204	hydrogen evolution reactions	1,303	1,408	18.89	93%
205	plasma facing component	2,071	2,305	18.89	90%
206	pv energy	1,742	1,929	18.89	90%
207	hvdc grid	1,085	1,144	18.89	95%
208	direct methanol fuel cells (dmfcs)	1,197	1,281	18.89	93%
209	bipolar plates	2,126	2,370	18.89	90%
210	bulk heterojunction (bhj)	1,637	1,808	18.89	91%
211	solar fuels	1,768	1,961	18.89	90%
212	wind power prediction	1,499	1,645	18.89	91%
213	c-si solar cells	1,060	1,115	18.89	95%
214	hydrothermal liquefaction	2,001	2,230	18.89	90%
215	silicon heterojunction solar cells	1,002	1,044	18.89	96%
216	large-scale wind power	1,236	1,330	18.89	93%
217	distributed renewable energy	1,390	1,516	18.89	92%
218	photovoltaic generation	3,472	3,801	18.89	91%
219	maximum power point (mpp)	2,449	2,731	18.88	90%
220	photocatalytic hydrogen generation	1,083	1,144	18.88	95%
221	concentrating solar power	2,656	2,956	18.88	90%
222	polymer electrolyte membrane fuel cell (pemfc)	1,135	1,208	18.88	94%
223	organic photovoltaic cells	1,571	1,733	18.88	91%
224	pefcs	1,324	1,438	18.88	92%
225	plug-in hybrid electric vehicles (phevs)	1,139	1,214	18.88	94%
226	methanol permeability	1,679	1,862	18.88	90%
227	dark fermentation	1,773	1,972	18.88	90%
228	high open-circuit voltage	1,470	1,615	18.88	91%
229	zero energy buildings	1,396	1,527	18.88	91%
230	photovoltaic/thermal	1,427	1,565	18.88	91%
231	fill factor (ff)	4,354	4,669	18.88	93%
232	fuel cell performance	4,655	4,951	18.88	94%
233	hydrogen storage alloys	1,480	1,630	18.88	91%
234	photovoltaic plant	1,805	2,014	18.88	90%
235	hybrid renewable energy system	1,788	1,995	18.88	90%
236	green roofs	2,616	2,925	18.88	89%
237	permanent magnet synchronous generator (pmsg)	2,264	2,539	18.88	89%
238	biodiesel synthesis	1,294	1,408	18.88	92%
239	photovoltaic (pv) cell	1,742	1,943	18.88	90%
240	integration of renewable energy	3,031	3,368	18.88	90%
241	biofuel cells	1,633	1,815	18.88	90%
242	hybrid renewable energy	2,367	2,655	18.87	89%
243	parallel hybrid	3,011	3,348	18.87	90%
244	high penetration of renewable energy	961	1,000	18.87	96%
245	wind power generator	1,466	1,617	18.87	91%
246	trough collector	2,178	2,445	18.87	89%
247	photovoltaic efficiency	1,371	1,503	18.87	91%
248	enhanced geothermal system	1,686	1,879	18.87	90%
249	electric vehicle charging station	1,613	1,793	18.87	90%
250	lithium metal anode	2,424	2,720	18.87	89%
251	partial shading condition	1,673	1,865	18.87	90%
252	ptb7-th	1,000	1,050	18.87	95%
253	methanol fuel cells	4,143	4,487	18.87	92%
254	fuel cell cathode	1,338	1,465	18.87	91%
255	biomass pyrolysis	3,232	3,584	18.87	90%
256	wind power forecasting	1,676	1,870	18.87	90%
257	pv panels	4,140	4,486	18.87	92%
258	floating wind	1,930	2,167	18.87	89%
259	biodiesels	1,708	1,909	18.87	89%
260	pv power plant	1,541	1,711	18.87	90%
261	plasma facing components	1,812	2,032	18.87	89%
262	the maximum power point tracking (mppt)	1,349	1,481	18.87	91%
263	dye sensitized solar cells (dsscs)	1,018	1,075	18.87	95%
264	solid oxide fuel cells (sofc)	1,364	1,500	18.87	91%
265	sulfur loading	1,866	2,097	18.87	89%
266	ev battery	1,662	1,858	18.87	89%
267	electrochemical hydrogen evolution	1,019	1,077	18.87	95%
268	wind turbines (wts)	969	1,015	18.87	95%
269	enhanced geothermal	1,828	2,054	18.87	89%
270	renewable energy application	1,694	1,897	18.87	89%
271	polymer electrolyte fuel cell (pefc)	954	997	18.86	96%
272	lithium sulfur batteries	905	936	18.86	97%
273	biohydrogen production	2,397	2,703	18.86	89%
274	fuel cell membrane	1,271	1,389	18.86	92%
275	ground heat exchanger	1,830	2,058	18.86	89%
276	generator (pmsg)	2,628	2,957	18.86	89%
277	zinc-air batteries	1,202	1,305	18.86	92%
278	high-performance anode material	1,150	1,241	18.86	93%
279	p3ht:pcbm	1,922	2,166	18.86	89%
280	stable perovskite solar cells	983	1,034	18.86	95%
281	anode catalyst	2,464	2,779	18.86	89%
282	integration of renewable energy sources	1,471	1,634	18.86	90%
283	lithiation/delithiation	1,503	1,673	18.86	90%
284	pemfcs	4,871	5,193	18.86	94%
285	chemical hydrogen storage	1,094	1,173	18.86	93%
286	biodiesel blends	2,468	2,786	18.86	89%
287	polymer electrolyte fuel cell	4,606	4,950	18.86	93%
288	tandem solar cell	3,193	3,563	18.86	90%
289	electric buses	1,335	1,472	18.86	91%
290	hl-2a	859	882	18.86	97%
291	quantum dot solar cell	1,151	1,246	18.86	92%
292	sofc cathode	966	1,016	18.86	95%
293	ga)se2 solar cell	874	901	18.86	97%
294	polymer electrolyte membrane (pem)	1,543	1,725	18.86	89%
295	renewable energy sources (res)	4,232	4,605	18.86	92%
296	utilization of renewable energy	1,420	1,577	18.86	90%
297	open-circuit voltage (voc)	3,942	4,327	18.86	91%
298	grid-connected photovoltaic (pv)	1,025	1,091	18.86	94%
299	series hybrid	1,404	1,559	18.86	90%
300	non-fullerene acceptors	1,090	1,173	18.85	93%
301	reversible capacities	1,556	1,744	18.85	89%
302	high voltage direct current	5,106	5,427	18.85	94%
303	proton exchange membrane (pem)	3,305	3,694	18.85	89%
304	pemfc stack	937	983	18.85	95%
305	intermediate-temperature solid oxide fuel cell	892	927	18.85	96%
306	fermentative hydrogen	1,058	1,135	18.85	93%
307	offshore wind power	2,287	2,599	18.85	88%
308	plug-in hybrid electric vehicle (phev)	923	967	18.85	95%
309	doubly fed induction generator (dfig)	3,391	3,789	18.85	89%
310	organic photovoltaics	5,024	5,366	18.85	94%
311	hydrogen storage performance	906	946	18.85	96%
312	photovoltaic power plant	1,951	2,217	18.85	88%
313	tidal turbine	1,424	1,589	18.85	90%
314	partial shading conditions	1,317	1,458	18.85	90%
315	charging infrastructure	3,196	3,588	18.85	89%
316	stimulated reservoir volume	1,160	1,264	18.85	92%
317	polymer electrolyte membrane fuel cell	5,044	5,387	18.85	94%
318	high voltage dc	1,980	2,252	18.85	88%
319	borehole heat exchanger	1,132	1,230	18.85	92%
320	tight oil reservoir	1,256	1,384	18.85	91%
321	multi-junction solar cell	1,239	1,363	18.85	91%
322	inorganic perovskite solar cell	862	892	18.85	97%
323	stability of perovskite solar cells	881	916	18.85	96%
324	wind turbine system	2,961	3,345	18.85	89%
325	electric vehicle (ev) charging	1,104	1,196	18.85	92%
326	photovoltaic (pv) systems	4,820	5,188	18.85	93%
327	solar cell efficiency	2,665	3,027	18.85	88%
328	pyrolysis of biomass	1,929	2,197	18.84	88%
329	ground source heat pump	2,728	3,099	18.84	88%
330	fuel cell applications	4,500	4,894	18.84	92%
331	energy efficiency optimization	1,128	1,228	18.84	92%
332	ground heat exchange	1,859	2,116	18.84	88%
333	lithium metal batteries	2,382	2,717	18.84	88%
334	ethanol permeability	1,717	1,948	18.84	88%
335	mmc-hvdc	1,083	1,172	18.84	92%
336	hybrid renewable	2,806	3,185	18.84	88%
337	renewable energy applications	1,467	1,648	18.84	89%
338	hydrogen storage material	4,342	4,748	18.84	91%
339	bipolar plate	3,027	3,424	18.84	88%
340	offshore wind farms	3,679	4,098	18.84	90%
341	am1.5g	1,401	1,568	18.84	89%
342	organic photovoltaics (opvs)	961	1,020	18.84	94%
343	thermophotovoltaic	1,809	2,060	18.84	88%
344	photocatalytic h2	4,306	4,717	18.84	91%
345	high-voltage direct current (hvdc)	1,083	1,174	18.84	92%
346	photovoltaic (pv) inverter	852	883	18.84	96%
347	catalytic hydrogen generation	1,218	1,343	18.84	91%
348	photovoltaic materials	1,923	2,196	18.84	88%
349	gas diffusion layer	4,017	4,440	18.84	90%
350	li dendrite	1,545	1,746	18.84	88%
351	solid-state dye-sensitized solar cell	872	909	18.84	96%
352	qdssc	901	946	18.84	95%
353	grid-connected photovoltaic system	1,282	1,424	18.84	90%
354	tight reservoir	2,463	2,816	18.84	87%
355	photovoltaic material	2,617	2,989	18.84	88%
356	wendelstein 7-x	1,068	1,158	18.84	92%
357	inverted perovskite solar cell	857	892	18.83	96%
358	ev charger	931	986	18.83	94%
359	thin-film solar cells	3,811	4,246	18.83	90%
360	nstx	1,051	1,138	18.83	92%
361	solar power generation	2,793	3,186	18.83	88%
362	photovoltaic power generation	3,677	4,112	18.83	89%
363	artificial photosynthesis	2,640	3,019	18.83	87%
364	bhj	3,065	3,479	18.83	88%
365	lithium-ion cell	2,321	2,663	18.83	87%
366	solar thermal collector	1,722	1,965	18.83	88%
367	microbial electrolysis cell	1,332	1,490	18.83	89%
368	dye sensitized solar cell	4,759	5,165	18.83	92%
369	lithium-ion battery anodes	830	859	18.83	97%
370	silicon anode	1,554	1,763	18.83	88%
371	offshore wind turbines	4,378	4,805	18.83	91%
372	plasma-facing component	1,214	1,345	18.83	90%
373	pbdb-t	903	953	18.83	95%
374	perturb and observe	2,648	3,034	18.83	87%
375	direct ethanol fuel cell	1,109	1,214	18.83	91%
376	shale gas reservoirs	2,151	2,474	18.83	87%
377	polymer electrolyte membrane (pem) fuel cell	1,013	1,093	18.83	93%
378	ev charging station	1,241	1,380	18.83	90%
379	sofc system	1,265	1,410	18.83	90%
380	wind power fluctuation	882	927	18.83	95%
381	cdte solar cell	1,669	1,906	18.83	88%
382	maximum power point tracking (mppt) algorithm	1,207	1,338	18.83	90%
383	tight reservoirs	1,638	1,869	18.83	88%
384	levelized cost of energy	1,850	2,123	18.83	87%
385	national renewable energy laboratory	2,215	2,549	18.83	87%
386	air battery	4,680	5,105	18.83	92%
387	fuel cell anode	1,091	1,193	18.83	91%
388	renewable energy laboratory	2,305	2,654	18.83	87%
389	sodium storage	2,479	2,851	18.83	87%
390	area specific resistance	1,150	1,268	18.83	91%
391	bipv	2,027	2,334	18.83	87%
392	integrated photovoltaics	1,142	1,258	18.83	91%
393	perturb and observ	2,736	3,137	18.82	87%
394	lithium ion battery	854	893	18.82	96%
395	lithium dendrite	1,907	2,194	18.82	87%
396	mppt algorithm	2,621	3,011	18.82	87%
397	ethanol fuel cells	4,929	5,343	18.82	92%
398	lifepo4 cathode	1,224	1,362	18.82	90%
399	solar cell applications	3,914	4,369	18.82	90%
400	li metal anode	1,760	2,021	18.82	87%
401	polar plates	2,173	2,507	18.82	87%
402	photovoltaic grid	1,231	1,372	18.82	90%
403	maximum power point tracking (mppt) control	1,115	1,226	18.82	91%
404	vsc-hvdc system	878	925	18.82	95%
405	renewable energy penetration	1,054	1,149	18.82	92%
406	photovoltaic generator	1,673	1,917	18.82	87%
407	variable renewable energy	1,468	1,667	18.82	88%
408	zinc-air battery	1,121	1,234	18.82	91%
409	pem fuel cells	3,786	4,247	18.82	89%
410	photovoltaic (pv) power generation	907	963	18.82	94%
411	thermal collector	2,616	3,012	18.82	87%
412	photovoltaics (pv)	2,166	2,503	18.82	87%
413	hydrogen storage system	1,390	1,573	18.82	88%
414	fuel cell catalyst	1,080	1,184	18.82	91%
415	non-renewable energy	2,768	3,182	18.82	87%
416	phev	4,229	4,692	18.82	90%
417	pv output	1,622	1,859	18.82	87%
418	li anode	1,475	1,679	18.82	88%
419	zinc-air	1,953	2,256	18.82	87%
420	solar photovoltaic system	2,127	2,460	18.82	86%
421	renewable energy production	2,486	2,871	18.82	87%
422	solid biofuel	1,098	1,208	18.82	91%
423	thermal liquefaction	2,024	2,341	18.82	86%
424	hydrothermal liquefaction (htl)	989	1,070	18.82	92%
425	anode supported	815	848	18.82	96%
426	biodiesel fuels	1,168	1,298	18.82	90%
427	bioenergy production	2,899	3,331	18.82	87%
428	wind penetration	1,163	1,292	18.81	90%
429	lithium-ion (li-ion)	1,088	1,197	18.81	91%
430	pyrolysis oil	2,593	2,995	18.81	87%
431	wave energy conversion	1,569	1,798	18.81	87%
432	gas diffusion layers	1,250	1,402	18.81	89%
433	catalytic hydrogen evolution	6,149	6,462	18.81	95%
434	air cathode	1,548	1,773	18.81	87%
435	pv device	2,013	2,332	18.81	86%
436	diesel yield	2,248	2,606	18.81	86%
437	perovskite absorber	953	1,026	18.81	93%
438	wind generators	2,357	2,732	18.81	86%
439	concentrating solar power (csp)	1,221	1,367	18.81	89%
440	inorganic perovskite solar cells	791	819	18.81	97%
441	ground source heat	2,806	3,236	18.81	87%
442	li-ion battery anode	832	872	18.81	95%
443	wind turbine power	1,268	1,428	18.81	89%
444	test blanket	972	1,052	18.81	92%
445	lithium-ion battery pack	950	1,024	18.81	93%
446	energy efficiency measures	1,940	2,251	18.81	86%
447	electric bus	2,571	2,979	18.81	86%
448	solar photovoltaic (pv)	5,133	5,572	18.81	92%
449	photovoltaic system	1,362	1,547	18.81	88%
450	lithiation process	1,688	1,949	18.81	87%
451	diesel and biodiesel	1,040	1,140	18.81	91%
452	pv devices	1,437	1,641	18.81	88%
453	photoactive layer	1,921	2,230	18.81	86%
454	bio-ethanol	1,503	1,723	18.81	87%
455	counter electrode (ce)	1,122	1,245	18.81	90%
456	battery anode	4,575	5,053	18.81	91%
457	renewable energy storage	1,091	1,206	18.81	90%
458	proton-exchange membrane fuel cell	1,050	1,154	18.81	91%
459	pemfc system	873	927	18.81	94%
460	solid electrolyte interphase (sei)	2,303	2,679	18.81	86%
461	lithium-ion cells	1,727	1,999	18.81	86%
462	na-ion battery	806	841	18.81	96%
463	primary energy saving	909	974	18.81	93%
464	shale reservoirs	3,093	3,558	18.81	87%
465	polymer electrolyte fuel cells (pefcs)	821	861	18.8	95%
466	electrocatalytic hydrogen evolution reaction	786	816	18.8	96%
467	solid electrolyte interface	1,890	2,197	18.8	86%
468	inverted perovskite solar cells	796	829	18.8	96%
469	wave energy converter	5,113	5,566	18.8	92%
470	green roof	3,458	3,946	18.8	88%
471	cell performances	1,481	1,700	18.8	87%
472	fermentative hydrogen production	916	984	18.8	93%
473	cathode catalyst	4,410	4,905	18.8	90%
474	wind turbine gear	1,167	1,306	18.8	89%
475	biofuel feedstock	1,226	1,381	18.8	89%
476	proton exchange membrane fuel cells	5,900	6,281	18.8	94%
477	thermal collectors	1,480	1,700	18.8	87%
478	fuel cell test	990	1,080	18.8	92%
479	energy efficiency improvement	2,981	3,443	18.8	87%
480	solar cell performance	4,097	4,600	18.8	89%
481	energy efficiency measure	2,154	2,513	18.8	86%
482	wind power plants	2,819	3,267	18.8	86%
483	inverted perovskite	884	944	18.8	94%
484	partial shading	3,285	3,770	18.8	87%
485	crystalline silicon solar cells	3,155	3,632	18.8	87%
486	wind power system	2,829	3,279	18.8	86%
487	dye-sensitized solar cells (dsscs)	6,271	6,610	18.8	95%
488	biodiesel blend	3,702	4,206	18.8	88%
489	solid oxide fuel cell (sofc)	5,773	6,176	18.8	93%
490	v2g	3,630	4,134	18.8	88%
491	perovskite solar cells (pscs)	6,951	7,188	18.8	97%
492	hybrid perovskite solar cell	842	891	18.8	95%
493	internal reforming	982	1,072	18.8	92%
494	cdte solar cells	1,373	1,570	18.8	87%
495	fast pyrolysis	4,510	5,013	18.8	90%
496	blanket module	1,365	1,560	18.8	88%
497	li-ion battery	871	929	18.8	94%
498	test blanket module	898	964	18.8	93%
499	pc61bm	1,286	1,461	18.8	88%
500	viral reservoir	1,619	1,877	18.8	86%
501	ethanol crossover	1,451	1,669	18.8	87%
502	hvdc transmission system	2,082	2,435	18.8	86%
503	photovoltaic power plants	1,136	1,271	18.8	89%
504	photovoltaic panels	4,511	5,019	18.8	90%
505	mppt control	2,656	3,095	18.8	86%
506	solar power plants	2,568	2,997	18.8	86%
507	tip speed ratio	2,170	2,540	18.8	85%
508	lithium metal anodes	1,076	1,195	18.8	90%
509	plasma-facing components	1,061	1,176	18.79	90%
510	hydrate reservoir	1,427	1,641	18.79	87%
511	tight sandstone reservoir	1,288	1,466	18.79	88%
512	high power conversion efficiency	2,246	2,630	18.79	85%
513	inverted polymer solar cell	714	728	18.79	98%
514	edge localized modes	915	988	18.79	93%
515	polymer solar cells	6,964	7,216	18.79	97%
516	ni-ysz	1,399	1,607	18.79	87%
517	rechargeable lithium-ion batteries	919	994	18.79	92%
518	building energy efficiency	2,127	2,493	18.79	85%
519	offshore wind energy	2,281	2,673	18.79	85%
520	si anode	1,188	1,341	18.79	89%
521	renewable energy resources	1,793	2,096	18.79	86%
522	solar desalination	1,705	1,989	18.79	86%
523	fuel cell stack	4,290	4,818	18.79	89%
524	clean energy source	1,654	1,927	18.79	86%
525	cathode catalysts	1,349	1,547	18.79	87%
526	lithium iron phosphate	2,281	2,677	18.79	85%
527	grid connected photovoltaic	1,056	1,173	18.79	90%
528	intermediate-temperature solid oxide fuel cells	741	765	18.79	97%
529	marine renewable energy	960	1,049	18.79	92%
530	her electrocatalyst	1,021	1,128	18.79	91%
531	ga)se2 (cigs)	1,203	1,362	18.79	88%
532	high voltage direct current (hvdc) transmission	780	816	18.79	96%
533	wind resources	1,573	1,829	18.79	86%
534	biodiesel fuel	3,726	4,256	18.79	88%
535	efficiency of photovoltaic	1,056	1,174	18.79	90%
536	cu(in,ga)se2	2,425	2,846	18.79	85%
537	pv arrays	1,672	1,952	18.79	86%
538	concentrator photovoltaic	1,032	1,144	18.79	90%
539	photovoltaic (pv) cells	1,111	1,246	18.79	89%
540	pv-battery	900	973	18.79	92%
541	photovoltaic inverters	793	834	18.79	95%
542	power conversion efficiencies	5,489	5,961	18.79	92%
543	hydrogen evolution performance	759	790	18.79	96%
544	photovoltaic-thermal	869	933	18.79	93%
545	plug-in hybrid	5,049	5,557	18.79	91%
546	hvdc systems	1,931	2,269	18.79	85%
547	methanol crossover	1,392	1,605	18.79	87%
548	quantum dot sensitized solar cell	798	841	18.79	95%
549	air-cathode	911	988	18.79	92%
550	sei layer	1,325	1,521	18.78	87%
551	mppt method	1,267	1,448	18.78	88%
552	renewable energy generation	4,520	5,059	18.78	89%
553	bioenergy crops	1,128	1,270	18.78	89%
554	incremental conductance	1,942	2,286	18.78	85%
555	photovoltaic conversion efficiency	929	1,013	18.78	92%
556	thin-film solar cell	4,619	5,158	18.78	90%
557	metal-air	2,571	3,022	18.78	85%
558	fowt	844	903	18.78	93%
559	photovoltaic characteristic	1,313	1,509	18.78	87%
560	heterojunction solar cells	5,808	6,265	18.78	93%
561	microbial electrolysis	1,371	1,583	18.78	87%
562	turbine tower	1,246	1,424	18.78	88%
563	multi-junction solar cells	967	1,064	18.78	91%
564	li ion battery	812	862	18.78	94%
565	pv cells	3,391	3,924	18.78	86%
566	turbine wake	1,408	1,631	18.78	86%
567	ga)se2 solar cells	735	762	18.78	96%
568	sulfur cathodes	803	851	18.78	94%
569	high discharge capacity	2,156	2,547	18.78	85%
570	biofuel	2,276	2,688	18.78	85%
571	observe (p&o)	1,264	1,449	18.78	87%
572	bio-fuel	2,577	3,035	18.78	85%
573	maximum power point tracker	1,399	1,621	18.78	86%
574	theoretical specific capacity	1,582	1,851	18.78	85%
575	am 1.5g	1,582	1,851	18.78	85%
576	sodiation	1,350	1,560	18.78	87%
577	floating offshore wind turbines	858	924	18.78	93%
578	reversible hydrogen storage	809	860	18.78	94%
579	renewable energy development	1,595	1,869	18.78	85%
580	doubly-fed induction generator	3,646	4,200	18.78	87%
581	e. fuel cell	879	952	18.78	92%
582	affordable and clean energy	832	891	18.77	93%
583	photovoltaic si	1,026	1,145	18.77	90%
584	nonfullerene acceptors	710	732	18.77	97%
585	am1.5	3,387	3,933	18.77	86%
586	concentrated solar power plant	755	791	18.77	95%
587	ecodesign	1,221	1,398	18.77	87%
588	biomass fuels	2,019	2,391	18.77	84%
589	anion exchange membrane fuel cell	722	748	18.77	97%
590	photovoltaics	4,533	5,100	18.77	89%
591	proton-exchange membrane	1,675	1,972	18.77	85%
592	wind turbine gearbox	1,016	1,133	18.77	90%
593	hybrid perovskite solar cells	785	831	18.77	94%
594	cu(in,ga)se	2,676	3,158	18.77	85%
595	oscillating water column	1,463	1,708	18.77	86%
597	onshore wind	2,067	2,451	18.77	84%
598	hybrid propulsion	1,236	1,419	18.77	87%
599	cu(in,ga)se2 solar cell	696	715	18.77	97%
600	bulk heterojunction organic solar cell	725	753	18.77	96%
601	sodium ion batteries (sibs)	773	816	18.77	95%
602	short-term wind power	924	1,014	18.77	91%
603	high reversible capacity	4,565	5,138	18.77	89%
604	pv/t	2,065	2,450	18.77	84%
605	unconventional reservoirs	3,691	4,260	18.77	87%
606	clean and renewable energy	1,060	1,192	18.77	89%
607	crystalline silicon solar cell	4,018	4,596	18.77	87%
608	pv plants	1,456	1,701	18.77	86%
609	solid-state dye-sensitized solar cells	729	759	18.77	96%
610	wind turbine control	995	1,108	18.77	90%
611	wind turbine blades	4,120	4,702	18.77	88%
612	fuel cell application	5,727	6,233	18.77	92%
613	lithium ion battery anode	698	719	18.77	97%
614	ev charging	5,436	5,970	18.77	91%
615	bifunctional electrocatalysts	1,975	2,346	18.77	84%
616	solar chimney	1,315	1,524	18.77	86%
617	alkaline fuel cell	1,533	1,801	18.77	85%
618	shale gas reservoir	3,061	3,595	18.77	85%
619	dye-sensitized solar cells (dssc)	815	873	18.77	93%
620	solar photovoltaics	1,882	2,234	18.77	84%
621	na-ion	3,746	4,326	18.77	87%
622	improving energy efficiency	3,073	3,610	18.77	85%
623	wind energy generation	1,067	1,204	18.77	89%
624	high power conversion	2,791	3,298	18.76	85%
625	photovoltaic (pv) energy	870	946	18.76	92%
626	qdsscs	730	762	18.76	96%
627	quantum dot solar cells	859	932	18.76	92%
628	wave energy converters (wecs)	756	797	18.76	95%
629	power forecasting	2,915	3,440	18.76	85%
630	net present cost	1,346	1,567	18.76	86%
631	current turbine	1,179	1,352	18.76	87%
632	solar thermal energy	2,575	3,058	18.76	84%
633	grid side converter	1,043	1,175	18.76	89%
634	parallel hybrid electric vehicle	858	932	18.76	92%
635	photovoltaic characteristics	1,235	1,425	18.76	87%
636	large-scale wind farm	757	799	18.76	95%
637	photovoltaic technologies	1,163	1,332	18.76	87%
638	uncertainty of wind power	721	752	18.76	96%
639	flexible solar cell	910	1,001	18.76	91%
640	rotor side converter	956	1,062	18.76	90%
641	sodium-ion batteries	7,352	7,659	18.76	96%
642	polymer electrolyte membrane fuel cells (pemfcs)	779	829	18.76	94%
643	thin-film solar	4,823	5,415	18.76	89%
644	w7-x	1,059	1,198	18.76	88%
645	irreversible capacity	1,445	1,697	18.76	85%
646	lithium ion diffusion	982	1,097	18.76	90%
647	renewable energy conversion	868	948	18.76	92%
648	photovoltaic installation	1,003	1,126	18.76	89%
649	efficiency of solar cells	1,271	1,476	18.76	86%
650	bulk-heterojunction solar cell	689	712	18.76	97%
651	fuel cell vehicles	2,339	2,794	18.76	84%
652	si solar cells	3,383	3,964	18.76	85%
653	short-circuit current density	6,162	6,658	18.76	93%
654	photovoltaic systems	1,613	1,913	18.76	84%
655	charging load	1,358	1,589	18.76	85%
656	inverted polymer solar cells	659	673	18.75	98%
657	tight oil reservoirs	877	961	18.75	91%
658	reservoir space	1,469	1,732	18.75	85%
659	multi-terminal hvdc	854	931	18.75	92%
660	wind power	3,883	4,494	18.75	86%
661	photovoltaic conversion	1,774	2,116	18.75	84%
662	hybrid-electric	1,258	1,462	18.75	86%
663	biodiesel combustion	821	888	18.75	92%
664	solar hydrogen production	920	1,019	18.75	90%
665	tubular solid oxide fuel cell	737	777	18.75	95%
666	photovoltaic plants	950	1,059	18.75	90%
667	solar cell application	5,281	5,869	18.75	90%
668	wind turbine tower	1,098	1,254	18.75	88%
669	formic acid fuel cell	736	776	18.75	95%
670	lithium-ion batteries (libs)	7,291	7,639	18.75	95%
671	quality reservoir	1,373	1,612	18.75	85%
672	photovoltaic cells	1,817	2,172	18.75	84%
673	spent lithium-ion batteries	852	930	18.75	92%
674	high-voltage dc	1,365	1,602	18.75	85%
675	grid-side converter	932	1,036	18.75	90%
676	polymer solar cell	7,643	7,932	18.75	96%
677	wind resource	3,561	4,165	18.75	85%
678	li-ion cell	1,875	2,245	18.75	84%
679	oscillating water column (owc)	779	834	18.75	93%
680	high pce	1,035	1,173	18.75	88%
681	photovoltaic modules	4,925	5,540	18.75	89%
682	floating wind turbines	772	825	18.75	94%
683	fuel cell electric vehicle	1,155	1,331	18.75	87%
684	electric vehicle charging	4,915	5,532	18.75	89%
685	hvdc cable	842	918	18.75	92%
686	photovoltaic power generation system	1,080	1,233	18.75	88%
687	solar tracking	1,517	1,799	18.75	84%
688	pv generation	3,316	3,908	18.75	85%
689	parabolic trough	4,292	4,924	18.75	87%
690	dfigs	1,085	1,240	18.75	88%
691	solid electrolyte interphase	3,861	4,486	18.75	86%
692	building-integrated photovoltaic	870	956	18.75	91%
693	electromobility shift assay	717	753	18.75	95%
694	en 14214	833	907	18.75	92%
695	solid-state lithium batteries	1,082	1,237	18.75	87%
696	multijunction solar cell	1,230	1,431	18.75	86%
697	improve energy efficiency	4,357	4,994	18.75	87%
698	pemfc performance	730	771	18.75	95%
699	small wind turbine	1,584	1,887	18.74	84%
700	mppt technique	1,510	1,793	18.74	84%
701	wind and solar power	1,565	1,863	18.74	84%
702	planar heterojunction	1,130	1,301	18.74	87%
703	concentrating photovoltaic	1,035	1,176	18.74	88%
704	electric mobility	1,711	2,048	18.74	84%
705	pv solar	1,394	1,646	18.74	85%
706	pv generator	1,275	1,492	18.74	85%
707	system energy efficiency	1,348	1,587	18.74	85%
708	lithium-ion storage	920	1,025	18.74	90%
709	(pemfc)	7,121	7,530	18.74	95%
710	photovoltaic technology	1,870	2,248	18.74	83%
711	biodiesel feedstock	922	1,028	18.74	90%
712	fuel cell vehicle	3,414	4,026	18.74	85%
713	ground heat exchangers	837	915	18.74	91%
714	lithium storage capacity	861	947	18.74	91%
715	energy efficient building	1,465	1,739	18.74	84%
716	wind turbine generators	1,885	2,268	18.74	83%
717	ht-pem	781	841	18.74	93%
718	composite anode	2,980	3,553	18.74	84%
719	ga)se2	3,021	3,599	18.74	84%
720	solid electrolyte interface (sei)	916	1,021	18.74	90%
721	sustainable energy system	1,475	1,753	18.74	84%
722	iso 26262	922	1,029	18.74	90%
723	thin film photovoltaic	1,099	1,264	18.74	87%
724	perturb and observe (p&o)	1,049	1,198	18.74	88%
725	all-polymer solar cell	633	645	18.74	98%
726	solar thermal collectors	1,070	1,226	18.74	87%
727	pv/t system	812	883	18.74	92%
728	hub height	1,073	1,230	18.74	87%
729	large-scale renewable energy	760	814	18.74	93%
730	annual energy production	1,171	1,360	18.74	86%
731	short-circuit photocurrent density	726	769	18.74	94%
732	sustainable energy source	1,637	1,962	18.74	83%
733	access to electricity	1,614	1,933	18.74	83%
734	cu(in,ga)se2 (cigs)	947	1,064	18.74	89%
735	high energy efficiency	4,609	5,266	18.74	88%
736	pv plant	2,853	3,417	18.74	83%
737	membrane electrode assemblies (meas)	657	678	18.74	97%
738	lifepo4 battery	684	714	18.74	96%
739	phenyl-c61-butyric acid methyl ester	1,901	2,294	18.74	83%
740	grid-connected pv	2,416	2,915	18.74	83%
741	smart energy	3,465	4,095	18.73	85%
742	wind potential	1,039	1,188	18.73	87%
743	photovoltaic solar cell	1,656	1,989	18.73	83%
744	national spherical torus experiment	630	643	18.73	98%
745	energy-efficient building	1,352	1,600	18.73	85%
746	delithiation	3,308	3,927	18.73	84%
747	perovskite photovoltaics	833	914	18.73	91%
748	solar pv system	2,398	2,897	18.73	83%
749	charging demand	1,430	1,702	18.73	84%
750	large wind farm	814	889	18.73	92%
751	bio-energy	1,585	1,901	18.73	83%
752	gasification of biomass	1,405	1,670	18.73	84%
753	csp plant	1,203	1,407	18.73	86%
754	scaps-1d	765	824	18.73	93%
755	solar cell structure	1,536	1,840	18.73	83%
756	pv installation	1,469	1,754	18.73	84%
757	li-air	817	894	18.73	91%
758	enhanced geothermal systems	965	1,092	18.73	88%
759	mppt controller	1,194	1,396	18.73	86%
760	renewable energy technology	1,433	1,708	18.73	84%
761	photovoltaic output	778	842	18.73	92%
762	all-polymer solar cells	619	630	18.73	98%
763	capacity fade	2,333	2,825	18.73	83%
764	wind generation system	811	887	18.73	91%
765	vehicle to grid (v2g)	684	717	18.73	95%
766	lithium dendrites	1,045	1,200	18.73	87%
767	photovoltaic energy	3,614	4,267	18.73	85%
768	renewable energy utilization	834	918	18.73	91%
769	fast charging station	734	784	18.73	94%
770	planar solid oxide fuel cell	736	787	18.73	94%
771	nearly zero energy building	732	782	18.73	94%
772	thin film solar cells	5,286	5,946	18.73	89%
773	hl-2a tokamak	627	642	18.73	98%
774	dye sensitized	5,074	5,745	18.73	88%
775	polymer photovoltaic	698	737	18.73	95%
776	rooftop photovoltaic	818	898	18.73	91%
777	energy renewable	1,635	1,972	18.73	83%
778	high theoretical capacity	2,873	3,459	18.73	83%
779	silicon photovoltaic	1,625	1,960	18.73	83%
780	trough solar collector	916	1,030	18.73	89%
781	energy access	1,807	2,190	18.72	83%
782	li4ti5o12	2,397	2,909	18.72	82%
783	ysz electrolyte	1,264	1,493	18.72	85%
784	global maximum power	927	1,045	18.72	89%
785	overall energy efficiency	1,498	1,798	18.72	83%
786	wind power plant	4,297	4,988	18.72	86%
787	lithium anode	1,571	1,893	18.72	83%
788	fuel cell stacks	1,051	1,212	18.72	87%
789	wind farm power	796	870	18.72	91%
790	quantum dot-sensitized solar cell	688	725	18.72	95%
791	intermittent renewable energy sources	790	862	18.72	92%
792	electric vehicle charging stations	888	994	18.72	89%
793	discharge specific capacity	1,645	1,989	18.72	83%
794	quantum dot sensitized solar cells	666	696	18.72	96%
795	photovoltaic renewable energy	698	739	18.72	94%
796	bioenergy feedstock	812	893	18.72	91%
797	future fusion	1,757	2,133	18.72	82%
798	wind park	1,283	1,522	18.72	84%
799	building-integrated	1,318	1,568	18.72	84%
800	cascade reservoir	858	955	18.72	90%
801	photovoltaic generation system	783	854	18.72	92%
802	perovskite solar cell (psc)	646	670	18.72	96%
803	conventional reservoirs	4,383	5,085	18.72	86%
804	concentrating solar	3,668	4,346	18.72	84%
805	ground source heat pump system	928	1,050	18.72	88%
806	photovoltaic power station	752	813	18.72	92%
807	lvrt	1,986	2,421	18.72	82%
808	shale reservoir	4,464	5,170	18.72	86%
809	energy saving potential	2,065	2,519	18.72	82%
810	power forecast	3,915	4,610	18.72	85%
811	pouch cell	1,955	2,384	18.72	82%
812	air batteries	6,832	7,372	18.72	93%
813	solar-to-fuel	669	702	18.72	95%
814	qdsc	738	795	18.72	93%
815	concentrated photovoltaic	781	853	18.72	92%
816	sulfur batteries	7,331	7,801	18.72	94%
817	hydrogen storage metal	717	767	18.72	93%
818	wind power production	823	910	18.72	90%
819	high performance anode	742	801	18.72	93%
820	energy biomass	1,333	1,592	18.72	84%
821	capacity decay	2,945	3,561	18.71	83%
822	generator (dfig)	5,831	6,490	18.71	90%
823	cellulosic ethanol	2,280	2,785	18.71	82%
824	unconventional reservoir	4,537	5,253	18.71	86%
825	proton exchange membrane (pem) fuel cells	806	888	18.71	91%
826	biodiesel production process	843	938	18.71	90%
827	donor materials	989	1,135	18.71	87%
828	high open circuit voltage	817	903	18.71	90%
829	polysulfide shuttle	659	690	18.71	96%
830	short rotation coppice	825	914	18.71	90%
831	lithium storage properties	859	960	18.71	89%
832	net zero energy	813	898	18.71	91%
833	photovoltaic properties	5,926	6,582	18.71	90%
834	initial discharge capacity	4,808	5,525	18.71	87%
835	dfig wind turbine	767	836	18.71	92%
836	parabolic trough solar collector	826	916	18.71	90%
837	li-ion diffusion	877	985	18.71	89%
838	photovoltaic industry	1,040	1,205	18.71	86%
839	bifunctional electrocatalyst	3,198	3,851	18.71	83%
840	global maximum power point	858	960	18.71	89%
841	power curtailment	1,061	1,234	18.71	86%
842	energy building	4,167	4,887	18.71	85%
843	ground source heat pump (gshp)	764	833	18.71	92%
844	voltage ride through	1,633	1,986	18.71	82%
845	layered cathode	1,264	1,505	18.71	84%
846	energy crops	4,036	4,753	18.71	85%
847	properties of biodiesel	950	1,085	18.71	88%
848	levelized cost of energy (lcoe)	926	1,053	18.71	88%
849	qdscs	610	626	18.71	97%
850	integration of wind power	790	869	18.71	91%
851	thin-film photovoltaic	1,080	1,261	18.71	86%
852	wind turbine rotor	1,409	1,698	18.71	83%
853	li-ion cells	1,370	1,647	18.71	83%
854	eco-design	1,701	2,076	18.71	82%
855	maximum power point tracking algorithm	872	981	18.71	89%
856	solar thermal system	1,445	1,746	18.71	83%
857	biocrude	897	1,015	18.71	88%
858	biomass fuel	4,006	4,730	18.71	85%
859	li+ diffusion	1,443	1,744	18.71	83%
860	pv power plants	778	854	18.71	91%
861	solar field	1,532	1,860	18.71	82%
862	multijunction solar cells	988	1,139	18.71	87%
863	wind energy potential	1,279	1,529	18.71	84%
864	energy efficiency of building	970	1,115	18.71	87%
865	marine renewable	1,119	1,316	18.71	85%
866	li metal batteries	1,075	1,257	18.7	86%
867	reservoir volume	2,383	2,923	18.7	82%
868	lithiophilic	923	1,052	18.7	88%
869	torrefaction	2,359	2,895	18.7	81%
870	renewable energy supply	892	1,010	18.7	88%
871	hybrid solar	4,080	4,814	18.7	85%
872	bio-fuels	1,207	1,435	18.7	84%
873	bulk-heterojunction solar cells	621	643	18.7	97%
874	wind power and photovoltaic	661	697	18.7	95%
875	wind turbine systems	1,025	1,191	18.7	86%
876	h2 storage	985	1,137	18.7	87%
877	wind turbine wake	923	1,053	18.7	88%
878	electric propulsion system	2,175	2,675	18.7	81%
879	biomass gasification	5,492	6,213	18.7	88%
880	lithium-ion diffusion	794	878	18.7	90%
881	the three gorges reservoir	2,973	3,616	18.7	82%
882	tandem cell	1,476	1,792	18.7	82%
883	efficient solar cells	1,005	1,165	18.7	86%
884	vehicle charging	5,524	6,246	18.7	88%
885	battery state of charge	1,839	2,259	18.7	81%
886	battery hybrid	1,322	1,590	18.7	83%
887	photovoltaic grid-connected	842	944	18.7	89%
888	hybrid energy system	2,488	3,055	18.7	81%
889	cell vehicles	2,513	3,085	18.7	81%
890	microbial fuel cells	6,388	7,041	18.7	91%
891	biodiesel industry	949	1,090	18.7	87%
892	charging stations	5,733	6,446	18.7	89%
893	heterojunction solar cell	6,977	7,560	18.7	92%
894	fullerene solar cells	605	623	18.7	97%
895	short-circuit photocurrent	1,290	1,549	18.7	83%
896	pv inverter	2,848	3,478	18.7	82%
897	cds buffer	714	771	18.7	93%
898	rural electrification	2,367	2,914	18.7	81%
899	rated wind speed	882	1,000	18.7	88%
900	alkaline fuel cells	968	1,117	18.7	87%
901	lithium secondary batteries	857	966	18.7	89%
902	photovoltaic (pv) plant	705	759	18.7	93%
903	large-scale photovoltaic	688	736	18.7	93%
904	bioethanol production	5,509	6,244	18.7	88%
905	astm d6751	740	807	18.7	92%
906	hydrogen-storage	778	859	18.7	91%
907	use of renewable energy	4,129	4,882	18.7	85%
908	fuel cell electrode	1,096	1,292	18.7	85%
909	point tracker	1,437	1,747	18.7	82%
910	sei film	778	860	18.69	90%
911	hydrogen production rate	3,174	3,857	18.69	82%
912	inertial confinement fusion (icf)	1,591	1,949	18.69	82%
913	proton exchange membranes	2,297	2,835	18.69	81%
914	si solar cell	4,582	5,350	18.69	86%
915	proton exchange membrane fuel cells (pemfc)	681	728	18.69	94%
916	membrane-electrode	979	1,135	18.69	86%
917	hybrid electric vehicles (hev)	713	772	18.69	92%
918	lithium-metal	1,037	1,214	18.69	85%
919	offshore wind farm	5,713	6,450	18.69	89%
920	solid-oxide fuel cell	955	1,103	18.69	87%
921	bulk heterojunction organic solar cells	616	641	18.69	96%
922	doubly fed induction generators	972	1,127	18.69	86%
923	li-o2	1,640	2,017	18.69	81%
924	h2 evolution	6,565	7,232	18.69	91%
925	full cells	1,940	2,400	18.69	81%
926	permanent magnet synchronous generator	4,405	5,184	18.69	85%
927	solar tracker	958	1,109	18.69	86%
928	green buildings	2,562	3,161	18.69	81%
929	solar module	2,717	3,344	18.69	81%
930	monopiles	781	867	18.69	90%
931	18650	1,118	1,327	18.69	84%
932	pv penetration	1,283	1,549	18.69	83%
933	wind generator	5,070	5,850	18.69	87%
934	hybrid vehicles	4,346	5,127	18.69	85%
935	lithium-ion battery cell	643	679	18.69	95%
936	dmfc	5,171	5,949	18.69	87%
937	electrochemical hydrogen storage	676	724	18.69	93%
938	trough collectors	890	1,017	18.69	88%
939	doubly-fed induction	3,926	4,691	18.69	84%
940	alkaline hydrogen evolution	631	663	18.69	95%
941	fusion power plant	1,320	1,600	18.69	83%
942	solar modules	1,743	2,154	18.69	81%
943	efficient buildings	1,926	2,387	18.69	81%
944	photoelectric conversion efficiency	1,945	2,411	18.69	81%
945	ev charge	1,091	1,292	18.69	84%
946	grid-connected pv system	1,322	1,603	18.69	82%
947	hvdc system	5,328	6,105	18.69	87%
948	wind generation	5,268	6,048	18.69	87%
949	specific discharge capacity	1,381	1,682	18.69	82%
950	variable renewable	2,110	2,619	18.69	81%
951	low voltage ride through	1,321	1,604	18.68	82%
952	li-o2 batteries	1,167	1,397	18.68	84%
953	solar air heater	1,721	2,129	18.68	81%
954	cu(in,ga)se2 solar cells	591	610	18.68	97%
955	silicon heterojunction	1,737	2,150	18.68	81%
956	bio-hydrogen	915	1,054	18.68	87%
957	parabolic trough collectors	805	903	18.68	89%
958	plasma-facing	2,072	2,575	18.68	80%
959	energy efficiency of buildings	871	994	18.68	88%
960	catalytic fast pyrolysis	686	740	18.68	93%
961	inverted organic solar cell	652	694	18.68	94%
962	hydrate reservoirs	847	962	18.68	88%
963	[6,6]-phenyl-c61-butyric acid methyl ester	1,082	1,284	18.68	84%
964	electric vehicles charging	713	778	18.68	92%
965	tight sandstone reservoirs	817	921	18.68	89%
966	open circuit voltage (ocv)	1,150	1,377	18.68	84%
967	tubular sofc	661	707	18.68	93%
968	lithium storage	6,273	7,007	18.68	90%
969	solar hydrogen	1,706	2,115	18.68	81%
970	reservoir permeability	2,170	2,702	18.68	80%
971	direct methanol fuel cell	7,295	7,910	18.68	92%
972	smart charging	1,192	1,435	18.68	83%
973	energy management strategy	3,648	4,414	18.68	83%
974	pefc	3,180	3,896	18.68	82%
975	pv inverters	1,285	1,561	18.68	82%
976	reservoir stimulation	1,066	1,265	18.68	84%
977	li plating	915	1,058	18.68	86%
978	solar power plant	4,268	5,076	18.68	84%
979	n719 dye	692	751	18.68	92%
980	energy-saving potential	1,128	1,350	18.68	84%
981	distributed renewable	1,791	2,228	18.68	80%
982	passive house	1,013	1,193	18.68	85%
983	voltage ride-through	1,283	1,560	18.68	82%
984	energy efficiency improvements	1,108	1,323	18.68	84%
985	wind power generators	651	695	18.68	94%
986	cascade reservoirs	744	823	18.68	90%
987	solar plant	1,815	2,260	18.68	80%
988	biomass gasifier	995	1,169	18.68	85%
989	high-capacity anode	677	731	18.67	93%
990	donor polymer	1,018	1,201	18.67	85%
991	photocatalytic hydrogen	8,111	8,612	18.67	94%
992	thin-film silicon solar cell	652	697	18.67	94%
993	high-quality reservoir	729	803	18.67	91%
994	photovoltaic array	3,714	4,497	18.67	83%
995	photovoltaic response	1,005	1,184	18.67	85%
996	reservoir heterogeneity	2,189	2,734	18.67	80%
997	solar thermal power	2,094	2,616	18.67	80%
998	international thermonuclear experimental reactor	2,120	2,649	18.67	80%
999	doubly fed induction generator	5,491	6,302	18.67	87%
1000	solar and wind energy	1,394	1,712	18.67	81%