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Efficient visible light-induced photoelectrochemical oxidation of water was achieved using a tungsten(IV) oxide (WO3) film composed of perpendicularly oriented plate-like crystallites, a flake-wall film, prepared on a transparent conductive substrate by controlling anisotropic crystal growth of tungsten oxide hydrate (WO3·H2O) followed by calcination.
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Amano et al. (2010) studied this question.
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