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Electro-oxidation of formic acid on the iridium electrode as a function of pH

✍ Scribed by J.E. Ferrer; Ll. Victori

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 610 KB
Volume: 38
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(93)85052-z

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✦ Synopsis

The behavior of the Ir electrode in formic acid solutions of different pH values was studied by cyclic voltammetry. The pH range was 1.6-12. Three different pH zones were observed: in the range 1.6-6 the intensity of formic acid oxidation increases with increasing pH; in the range 6-7, the intensity starts to decrease slowly with increasing pH; in the range 7-12, the intensity decreases very sharply with increasing pH, and the intensity is dramatically dependent on the potential sweep limits; at pH 11, all measurable electrocatalytic activity has already disappeared. The dependence of these phenomena on the electrode surface layer properties and the reaction pathway is discussed.

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