Abstract
Summary The basic electrochemical properties of an anodic film formed on platinum from oxide solutions in a lithium chloride-potassium chloride melt at around 430°C were investigated. In spite of the very different temperature and solvent system, very similar behaviour to the aqueous systems was found using galvanostatic, potentiostatic and e.m.f. decay transients. The anodic behaviour qualitatively supports the notion of a field assisted oxygen incorporation as the rate-determining step for film formation as suggested for aqueous systems. Film reduction occurred over a large potential range, which was ascribed to a large distribution of site energies within the oxide phase. The characteristic “film ageing” effects seen with aqueous systems were also observed. At higher anodic potentials under chronopotentiometric conditions, the reversible discharge of oxygen probably occurred on both platinum and gold electrodes.
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