Iron(III)-titanium(IV)-oxide electrodes: Their structural,electrochemical and photoelectrochemical properties |
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Authors: | Bodo Danzfuss Ulrich Stimming |
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Institution: | Institut für Physikalische Chemie der Universität Düsseldorf, Universitätsstrasse 1, D-4000 Düsseldorf 1, F.R.G. |
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Abstract: | Iron(III)-titanium(IV)-oxides of the general composition FexTi1-xOy were prepared in the composition range x=0–0.9 by thermal decomposition of the corresponding metal salt solutions. For a medium range of composition, 0.1≤x≤0.7, amorphous oxides were formed under the given conditions of preparation. Electrochemical properties such as reduction and re-oxidation of the oxide, electrode capacity behaviour, oxygen evolution and reduction and the redox reaction, Fe2+/Fe3+, were investigated. Photoelectrochemical properties were obtained from photocurrent spectra and the dependence on potential of the photocurrent. Annealing experiments showed that crystallization yields lower photocurrents and a shift of the photocurrents spectra to shorter wavelengths. Thus, amorphous semiconductors seem worth being investigated for a possible application in electrochemical solar cells. An attempt is made to describe the impact of non-crystallinity on the photoelectrochemical behaviour of semiconductors. A model of the oxide is proposed to explain the electrochemical and photoelectrochemical properties of the oxides FexTi1-xOy. |
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Keywords: | New address (to where all correspondence should be addressed): Columbia University Dept of Chem Engineering and Appl Chemistry New York NY 10027 U S A |
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