Iron(III)-titanium(IV)-oxide electrodes: Their structural, electrochemical and photoelectrochemical properties

Bodo Danzfuss, Ulrich Stimming

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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.

Original languageEnglish
Pages (from-to)89-119
Number of pages31
JournalJournal of Electroanalytical Chemistry
Volume164
Issue number1
DOIs
StatePublished - 10 Apr 1984
Externally publishedYes

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