Photoelectrochemical water oxidation by cobalt cytochrome c integrated-ato photoanode

Carla Casadevall, Haojie Zhang, Shaojiang Chen, Dayn J. Sommer, Dong Kyun Seo, Giovanna Ghirlanda

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Here, we report the immobilization of Co-protoporphyrin IX (Co-PPIX) substituted cy-tochrome c (Co-cyt c) on Antimony-doped Tin Oxide (ATO) as a catalyst for photoelectrochemical oxidation of water. Under visible light irradiation (λ > 450 nm), the ATO-Co-cyt c photoanode displays ~6-fold enhancement in photocurrent density relative to ATO-Co-PPIX at 0.25 V vs. RHE at pH 5.0. The light-induced water oxidation activity of the system was demonstrated by detecting evolved stoichiometric oxygen by gas chromatography, and incident photon to current efficiency was measured as 4.1% at 450 nm. The faradaic efficiency for the generated oxygen was 97%, with a 671 turnover number (TON) for oxygen. The current density had a slow decay over the course of 6 h of constant irradiation and applied potential, which exhibits the robustness of catalyst-ATO interaction.

Original languageEnglish (US)
Article number626
Issue number5
StatePublished - May 2021


  • Antimony-doped tin oxide (ATO)
  • Co-cytochrome c
  • Photoelectrochemistry
  • Semiartificial photosynthesis
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


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