Piezoelectric Detection of Oxide Formation and Reduction on Platinum Electrodes

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Abstract
Piezoelectric detection of change in surface stress, produced by a potential modulation, was applied to investigate oxide formation and reduction on platinum electrodes in perchloric acid solutions, in the presence and absence of chloride ions. In the solution without Cl− ions, piezoelectric signals indicated that rearrangement or place exchange of surface atoms took place prior to monolayer formation of and induced a sign reversal of the surface electric charge. Addition of Cl− ions into the solution retarded the discharge reaction of adsorbed water molecules but promoted the rearrangement or place exchange of surface atoms. The formation took place on a small fraction of surface sites via displacement or a substitution step of adsorbed Cl− ions, and contributed to the sign‐reversal of surface charge.

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