We investigated the structure and photo-electrochemical properties for water splitting of tungsten trioxide-ferric oxide thin films formed by spray pyrolysis. While annealing at 600°C produces films consisting of a mixture of monoclinic WO₃ and hematite α-Fe₂O₃, the heating at a temperature above 1000°C affords formation of ferric tungstate Fe₂WO₆. Both kinds of films exhibit optical absorption range comparable or exceeding that of α-Fe₂O₃. Another important feature is a decreased rate of charge recombination of the mixed-oxide Fe₂O₃-WO₃ with respect to the ferric oxide photo-anodes.

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Vol. 07, No. 06

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Received 3 April 2014

Accepted 1 September 2014

Published: 23 September 2014

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Nanoporous WO₃–Fe₂O₃ films; structural and photo-electrochemical characterization

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