%0 Journal Article %T Earth-Abundant Molecular Z-Scheme Photoelectrochemical Cell for Overall Water-Splitting %+ Solar fuels, hydrogen and catalysis (SolHyCat ) %+ Department of Chemistry, School of Science %+ Department of Energy and Hydrocarbon Chemistry %+ Laboratoire Innovation en Chimie des Surfaces et NanoSciences (LICSEN UMR 3685) %+ Abber Center of Photonics %+ Leibniz Institute of Photonic Technology Jena, Department Functional Interfaces %A Windle, Christopher, D. %A Kumagai, Hiromu %A Higashi, Masanobu %A Brisse, Romain %A Bold, Sébastien %A Jousselme, Bruno %A Chavarot-Kerlidou, Murielle %A Maeda, Kazuhiko %A Abe, Ryu %A Ishitani, Osamu %A Artero, Vincent %Z Strategic International Collaborative Research Program (PhotoCAT project) from Japan Science and Technology Agency (JST) %Z JSPS KAKENHI Grant Number 17H06439 in Scientific Research on Innovative Areas “Innovations for Light-Energy Conversion (I4LEC) %< avec comité de lecture %@ 0002-7863 %J Journal of the American Chemical Society %I American Chemical Society %V 141 %N 24 %P 9593-9602 %8 2019 %D 2019 %R 10.1021/jacs.9b02521 %Z Chemical Sciences/Material chemistry %Z Chemical Sciences/CatalysisJournal articles %X A push-pull organic dye and a cobaloxime catalyst were successfully co-grafted on NiO and CuGaO$_2$ to form efficient molecular photocathodes for H$_2$ production with >80% Faradaic efficiency. CuGaO$_2$ is emerging as a more effective p-type semiconductor in photoelectrochemical cells and yields a photocathode with four-fold higher photocurrent densities and 400 mV more positive onset photocurrent potential compared to the one based on NiO. Such an optimized CuGaO$_2$ photocathode was combined with a TaONǀCoO$_x$ photoanode in a photoelectrochemical cell. Operated in this Z-scheme configuration, the two photoelectrodes 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 5.4×10$^{−3}$%. 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. %G English %2 https://cea.hal.science/cea-02147070/document %2 https://cea.hal.science/cea-02147070/file/Windle_JACS2019_V0.pdf %L cea-02147070 %U https://cea.hal.science/cea-02147070 %~ CEA %~ UGA %~ CNRS %~ IRTSV-CBM %~ PUBNIMBE %~ DSV %~ INC-CNRS %~ IRAMIS-NIMBE %~ CEA-UPSAY %~ UNIV-PARIS-SACLAY %~ CEA-UPSAY-SACLAY %~ CEA-DRF %~ BIG %~ IRIG %~ CEA-GRE %~ TEST-HALCNRS %~ UGA-COMUE %~ ANR %~ GS-ENGINEERING %~ IRAMIS %~ GS-CHIMIE %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE