✦ LIBER ✦

Charge transfer reactions across oxide covered Titanium Electrodes

✍ Scribed by Dr. M. W. Khalil

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 545 KB
Volume: 23
Category: Article
ISSN: 0933-5137
DOI: 10.1002/mawe.19920230206

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✦ Synopsis

Abstract

The kinetics of the charge transfer process of the ferro‐/ferricyanide Redox system on anodically formed titanium oxide layers is studied. The oxides were formed potentiodynamically in borate buffer solutions of pH = 8. Anodic and cathodic Tafel lines were measured at a scan rate of 1.0 mV · S^−1^. Oxide thickness was measured using capacitance technique at a frequency of 1.0 KHz. The log of the exchange cd, i~0~ for the Redox system was found to decrease linearly with the oxide thickness in agreement with the theoretical treatment of Heusler. Tunneling of the electron represents the main process for the charge transfer for oxides formed at potentials below O~2~‐evolution. Temporary breakdown of the oxide around the O~2~‐evolution potential, causes an increase of i~O~ with thickness. The reaction order was 0.8–0.85 with respect to the Redox system. The low values of the anodic transfer coefficient supports earlier results on similar n‐type semiconductor electrodes.

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