Jump to main content
Jump to site search

Issue 21, 2011
Previous Article Next Article

Electrochemical deposition and photoelectrochemistry of CuWO4, a promising photoanode for water oxidation

Author affiliations

Abstract

Polycrystalline thin film photoanodes composed of CuWO4 have been prepared by electrodeposition from an acidic aqueous solution. This 2–3 μm thick n-type material has an indirect band gap of 2.25 eV, 0.45 V smaller than the gap of WO3. The flat band potential and donor density determined by Mott–Schottky analysis of the electrochemical impedance spectra are +0.4 V (vs. NHE) and 2.7 × 1021 cm−3 respectively, similar to those observed in crystalline WO3. This implies that the lower band gap is due to a raised valence band maximum, desirable for water oxidation photoanodes. Under neutral conditions afforded by a pH 7 potassium phosphate buffer, electrodeposited CuWO4 generates a photocurrent density of 0.16 mA cm−2 at an applied bias of +0.5 V (vs Ag/AgCl) under simulated solar irradiation. Electrodeposited CuWO4 films demonstrate higher chemical stability than polycrystalline WO3, both under continuous illumination and in the dark. CuWO4 oxidizes methanol and maintains a stable steady-state photocurrent density of 0.11 mA cm−2 after 12 h of continuous illumination in a 10% methanol solution in aqueous electrolyte. This is twice the current density observed without methanol added.

Graphical abstract: Electrochemical deposition and photoelectrochemistry of CuWO4, a promising photoanode for water oxidation

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 07 Feb 2011, accepted on 29 Mar 2011 and first published on 18 Apr 2011


Article type: Paper
DOI: 10.1039/C1JM11259G
Citation: J. Mater. Chem., 2011,21, 7651-7660
  •   Request permissions

    Electrochemical deposition and photoelectrochemistry of CuWO4, a promising photoanode for water oxidation

    J. E. Yourey and B. M. Bartlett, J. Mater. Chem., 2011, 21, 7651
    DOI: 10.1039/C1JM11259G

Search articles by author