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KMID : 1059519860300010019
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Journal of the Korean Chemical Society
1986 Volume.30 No. 1 p.19 ~ p.26
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Studies on the Electrochemical Properties of TiO2-x Thin Films
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Choi Q-Won
Choe Chu-Hyun
Chjo Ki-Hyung
Choi Yong-Kook
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Abstract
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A titanium oxide thin films were prepared by air oxidation and vapour oxidation and a TiO2 single crystal was reduced by heating in an argon atmosphere. All the electrode characteristics of the TiO2-x, thin films are not different from those of slightly reduced single crystal rutile. In cyclic voltammogram of oxygen containing electrolyte solution at TiO2-x electrodes, cathodic peaks were observed at between -0.8V and -1.0V vs. SCE. The cathodic current near 0V vs. SCE in saturated solution with nitrogen was observed to be greater than in saturated solution with air. The chronoamperogram was represented by the equation of i = i0e-kt, when the rate constant k was represented by the equation of k =k0[H+]n exp(Aη+Ea/RT). The values of activation energy Ea were found to be 4.6∼4.8kcal/mole in overpotential range of 0.035∼0.145 V and 1.6kcal/mole in overpotential range of 0.2∼0.5V. The values of n and A were found to be 0. 1 and 5.4∼5.6/V in range of 0.035∼0.145V, and in range of 0.2∼0.5V, to be 0.04 and 1.3/V, respectively. This can be interpreted as an totally irreversible reduction of oxygen.
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