Earth-Abundant Molecular Z-Scheme Photoelectrochemical Cell for Overall Water-Splitting

Christopher D. Windle, Hiromu Kumagai, Masanobu Higashi, Romain Brisse, Sebastian Bold, Bruno Jousselme, Murielle Chavarot-Kerlidou, Kazuhiko Maeda, Ryu Abe, Osamu Ishitani, Vincent Artero

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


A push-pull organic dye and a cobaloxime catalyst were successfully cografted on NiO and CuGaO2 to form efficient molecular photocathodes for H2 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 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|CoOx photoanode in a photoelectrochemical cell. Operated in this Z-scheme configuration, the two photoelectrodes produced H2 and O2 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.

Original languageEnglish
Pages (from-to)9593-9602
Number of pages10
JournalJournal of the American Chemical Society
Issue number24
Publication statusPublished - 2019 Jun 19

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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