Role of Surface States in Photocatalytic Oxygen Evolution with CuWO4 Particles

Wu, Zongkai; Zhao, Zeqiong; Cheung, Ghunbong; Doughty, Rachel M.; Ballestas-Barrientos, Alfonso R.; Hirmez, Benel; Han, Ruirui; Maschmeyer, Thomas; Osterloh, Frank E.

doi:10.1149/2.0021905jes

Role of Surface States in Photocatalytic Oxygen Evolution with CuWO₄ Particles

Journal Article · Sat Nov 10 00:00:00 EST 2018 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0021905jes· OSTI ID:1481806

Wu, Zongkai; Zhao, Zeqiong; Cheung, Ghunbong; Doughty, Rachel M.; Ballestas-Barrientos, Alfonso R.; Hirmez, Benel; Han, Ruirui; Maschmeyer, Thomas;

CuWO₄ is a medium bandgap (2.3 eV) n-type semiconductor capable of photoelectrochemical water oxidation under applied electrical bias. Here, we show for the first time that suspended microcrystals CuWO₄ evolve oxygen photocatalytically under visible illumination from solutions of 0.05 M AgNO₃ (10.8 μmol/hour; AQE of 0.56% at 400 nm) and 0.0002 M FeCl₃ (1.5 μmol/hour). No oxygen is detected with 0.002 M [Fe(CN)₆]^3- as sacrificial agent. The activity dependence on the redox potential of the acceptors is due to the presence of Cu²⁺ based electron trap states in CuWO₄. According to surface photovoltage spectroscopy and electrochemistry, these states are located on the particle surface, 1.8 eV above the valence band edge of the material. Controlling the chemistry of these states will be key to uses of CuWO₄ particles in tandem catalysts for overall water splitting.

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Research Organization:: Univ. of California, Davis, CA (United States)

Sponsoring Organization:: Australian Research Council (ARC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0015329

OSTI ID:: 1481806

Alternate ID(s):: OSTI ID: 1612276

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 166; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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