Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 24, Pages 9593-9602Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b02521
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Funding
- Strategic International Collaborative Research Program (PhotoCAT project) from Japan Science and Technology Agency (JST)
- French National Research Agency [ANR-14-JTIC-0004-01, ANR-11-LABX-0003-01, ANR-17-EURE-0003, JP16H06441]
- CREST (Molecular Technology project, JST)
- JSPS KAKENHI [17H06439]
- Agence Nationale de la Recherche (ANR) [ANR-14-JTIC-0004] Funding Source: Agence Nationale de la Recherche (ANR)
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A push-pull organic dye and a cobaloxime catalyst were successfully cografted on NiO and CuGaO2 to form efficient molecular photocathodes for H-2 production with >80% Faradaic efficiency. CuGaO2 is emerging as a more effective p-type semiconductor in photoelectrochemical cells and yields a photocathode with 4-fold higher photocurrent I so densities and 400 mV more positive onset photocurrent potential compared to the one based on NiO. Such an optimized CuGaO2 photocathode was combined with a TaON vertical bar CoOx photoanode in a photoelectrochemical cell. Operated in this Z-scheme configuration, the two photo-electrodes produced H-2 and O-2 from water with 87% and 88% Faradaic efficiency, respectively, at pH 7 under visible light and in the absence of an applied bias, equating to a solar to hydrogen conversion efficiency of 5.4 X 10(-3)%. This is, to the best of our knowledge, the highest efficiency reported so far for a molecular-based noble metal-free water splitting Z-scheme.
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