4.6 Article

Reactive Sputtering of Bismuth Vanadate Photoanodes for Solar Water Splitting

Journal

JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 42, Pages 21635-21642

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jp406019r

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Funding

  1. Office of Science of the U.S. Department of Energy [DE-SC0004993]
  2. Marie Curie Actions Program

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Bismuth vanadate (BiVO4) has attracted increasing attention as a photoanode for photoelectrochemical (PEC) water splitting. It has a band gap in the visible light range (2.4-2.5 eV) and a valence band position suitable for driving water oxidation under illumination. While a number of methods have been used to make BiVO4 photoanodes, scalable thin film deposition has remained relatively underexplored. Here, we report the synthesis of BiVO4 thin films by reactive sputtering. The use of separate Bi and V sputtering targets allows control of the Bi/V ratio in the film. Under optimized, slightly V-rich conditions, monoclinic phase BiVO4 with photoactivity for water oxidation is obtained. The highest photocurrents, ca. 1 mA cm(-2) at the reversible O-2/H2O potential with simulated AM 1.5G illumination, are obtained with bilayer WO3/BiVO4, where the WO3 serves as a hole-blocking layer.

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