Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 25, Pages 4570-4577Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201600615
Keywords
chalcopyrites; hydrogen; photocathodes; photoelectrochemistry; water splitting
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Funding
- Japan Society for the Promotion of Science (JSPS) [23000009]
- Precursory Research for Embryonic Science and Technology (PRESTO) of Japan Science and Technology Agency (JST)
- Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [12024046]
- Ministry of Economy, Trade and Industry (METI) of Japan
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [15K17895, 16H02417] Funding Source: KAKEN
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Thin films of a solid solution of ZnSe and CuIn0.7Ga0.3Se2 ((ZnSe) (x) (CIGS) (1-x) ) are prepared by co-evaporation. Structural characterization reveals that the ZnSe and CIGS form a solid solution with no phase separation. (ZnSe)(0.85)(CIGS)(0.15)-based photocathodes modified with Pt, Mo, Ti, and CdS exhibit a photocurrent of 7.1 mA cm(-2) at 0 V-RHE, and a relatively high onset potential of 0.89 V-RHE under simulated sunlight. A two-electrode cell containing a (ZnSe)(0.85)(CIGS)(0.15) photocathode and a BiVO4-based photoanode has an initial solar-to-hydrogen conversion efficiency of 0.91%, which is one of the highest values reported for a photoanode-photocathode combination. Thus, (ZnSe)(0.85)(CIGS)(0.15) is a promising photocathode material for efficient photoelectrochemical water splitting.
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