Photoelectrochemical oxidation of anions by WO3 in aqueous and nonaqueous electrolytes

Qixi Mi, Robert H. Coridan, Bruce S. Brunschwig, Harry B. Gray, Nathan S. Lewis

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The behavior of WO3 photoanodes has been investigated in contact with a combination of four anions (Cl-, CH3SO 3-, HSO4-, and ClO4 -) and three solvents (water, acetonitrile, and propylene carbonate), to elucidate the role of the semiconductor surface, the electrolyte, and redox kinetics on the current density vs. potential properties of n-type WO 3. In 1.0 M aqueous strong acids, although the flat-band potential (Efb) of WO3 was dominated by electrochemical intercalation of protons into WO3, the nature of the electrolyte influenced the onset potential (Eon) of the anodic photocurrent. In aprotic solvents, the electrolyte anion shifted both Efb and E on, but did not significantly alter the overall profile of the voltammetric data. For 0.50 M tetra(n-butyl)ammonium perchlorate in propylene carbonate, the internal quantum yield exceeded unity at excitation wavelengths of 300-390 nm, indicative of current doubling. A regenerative photoelectrochemical cell based on the reversible redox couple B 10Br10-/2- in acetonitrile, with a solution potential of ∼1.7 V vs. the normal hydrogen electrode, exhibited an open-circuit photovoltage of 1.32 V under 100 mW cm-2 of simulated Air Mass 1.5 global illumination.

Original languageEnglish
Pages (from-to)2646-2653
Number of pages8
JournalEnergy and Environmental Science
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 1 2013

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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