Nanostructured WO3/BiVO4Heterojunction Films for Efficient Photoelectrochemical Water Splitting
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- 22 April 2011
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 11 (5), 1928-1933
- https://doi.org/10.1021/nl2000743
Abstract
We report on a novel heterojunction WO3/BiVO4 photoanode for photoelectrochemical water splitting. The heterojunction films are prepared by solvothermal deposition of a WO3 nanorod-array film onto fluorine-doped tin oxide (FTO) coated glass, with subsequent deposition of a low bandgap, 2.4 eV, visible light responding BiVO4 layer by spin-coating. The heterojunction structure offers enhanced photoconversion efficiency and increased photocorrosion stability. Compared to planar WO3/BiVO4 heterojunction films, the nanorod-array films show significantly improved photoelectrochemical properties due, we believe, to the high surface area and improved separation of the photogenerated charge at the WO3/BiVO4 interface. Synthesis details are discussed, with film morphologies and structures characterized by field emission scanning electron microscopy and X-ray diffraction.Keywords
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