Abstract
A procedure is described whereby thin films of an alkylamine-siloxane polymer can be formed on Pt electrode surfaces. The polymer film strongly partition ferrocyanide ion from aqueous pH 3.2 electrolyte, and electrochemical reaction of the trapped ferrocyanide ions can be stably observed. Kinetics of two electrocatalytic reactions are described. One is the electron self-exchange between neighbor ferrocyanide and ferricyanide ions by which electrochemical charge becomes transported through the multimolecular-layer film. The second is the oxidation of ascorbic acid by ferricyanide electrogenerated in the film. Both reactions exhibit rate constants in the polymer film which are larger than those of the analogous homogeneous solution reaction.
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