Journal
JOURNAL OF CATALYSIS
Volume 350, Issue -, Pages 197-202Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.04.008
Keywords
Copper (II) tungstate; Hydrothermal; Absorption; Water splitting; IPCE
Categories
Funding
- Basic Science Program through the National Research Foundation - Ministry of Science, ICT, and Future Planning, Republic of Korea [NRF-2015R1A2A 2A01003790]
- BK-plus program
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Copper (II) tungstate (CuWO4) has better light absorption and selectivity for a photochemical water splitting reaction than those of its binary oxide counterpart. In this work, we report a facile single-step hydrothermal method time. CuWO4 was synthesized via the condensation of a stable aqueous precursor solution of peroxopolytungstic acid and a copper precursor. The proposed method uniformly deposited CuWO4 on fluorine -doped tin oxide with strong adhesion. The obtained CuWO4 films showed a superior photocurrent density of 0.6 mA/cm(2) at 1.23 V vs. a reversible hydrogen electrode in a 0.1 M Na2SO4 electrolyte, which was relatively higher than the values recently reported for CuWO4 photoanodes. The optimized CuWO4 exhibited an incident photon-to-current conversion efficiency of 30% at 350 nm for the photoelectrochemical oxidation of water. An X-ray photoelectron spectroscopy valence band edge analysis revealed an increase in the valence band edge position in the CuWO4, along with a decrease in the band gap compared to those in WO3. The procedure proposed here provides a promising approach for the design of an efficient CuWO4 photoanode for water splitting. (C) 2017 Elsevier Inc. All rights reserved.
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