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Title: Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
Authors: Wang, Danping
Qi, Huan
Zhao, Xin
Xu, Rong
Sritharan, Thirumany
Chen, Zhong
Bassi, Prince Saurabh
Wong, Lydia Helena
Keywords: Charge Separation
Composite Thin Film
Issue Date: 2016
Source: Wang, D., Bassi, P. S., Qi, H., Zhao, X., Gurudayal, Wong, L. H., . . . Chen, Z. (2016). Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation. Materials, 9(5), 348-. doi:10.3390/ma9050348
Series/Report no.: Materials
Abstract: Porous tungsten oxide/copper tungstate (WO3/CuWO4) composite thin films were fabricated via a facile in situ conversion method, with a polymer templating strategy. Copper nitrate (Cu(NO3)2) solution with the copolymer surfactant Pluronic®F-127 (Sigma-Aldrich, St. Louis, MO, USA, generic name, poloxamer 407) was loaded onto WO3 substrates by programmed dip coating, followed by heat treatment in air at 550 °C. The Cu2+ reacted with the WO3 substrate to form the CuWO4 compound. The composite WO3/CuWO4 thin films demonstrated improved photoelectrochemical (PEC) performance over WO3 and CuWO4 single phase photoanodes. The factors of light absorption and charge separation efficiency of the composite and two single phase films were investigated to understand the reasons for the PEC enhancement of WO3/CuWO4 composite thin films. The photocurrent was generated from water splitting as confirmed by hydrogen and oxygen gas evolution, and Faradic efficiency was calculated based on the amount of H2 produced. This work provides a low-cost and controllable method to prepare WO3-metal tungstate composite thin films, and also helps to deepen the understanding of charge transfer in WO3/CuWO4 heterojunction.
ISSN: 1996-1944
DOI: 10.3390/ma9050348
Rights: © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
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