Abstract
Evidence is presented for inhibition of hydrogen ion reduction in acidic halide media at a platinum electrode in the presence of tin. This inhibition is traced to a film of tin hydrous oxide formed when hydrogen ion is reduced, causing the pH to increase in the vicinity of the electrode, and allowing hydrolytic precipitation to occur. The film was investigated employing voltammetry, chronopotentiometry and spectrophotometry. The stability of the film and its effect on other electrode reactions was examined, and a mechanism for its formation proposed.
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