SONOVOLTAMMETRY AT PLATINUM-ELECTRODES - SURFACE PHENOMENA AND MASS-TRANSPORT PROCESSES

Application of simultaneous ultrasound to representative solution-phas e reversible voltammetric couples produce a step-shaped voltammogram a t platinum electrodes of both 'macro' and 'micro' dimensions. The limi ting current increases with ultrasonic power, but is not markedly affe cted by ultrasonic frequency in the 20-800 kHz region. In contrast the complex voltammetry of a platinized platinum electrode surface within the hydrogen adsorption regime in aqueous acid medium is very little affected by sonication. Factors affecting the reproducibility of sonoe lectrochemical experiments when employing ultrasonic sources are discu ssed.