The Effect of Acidity on the Differential Capacity of Polarized Platinum Electrodes

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Abstract
Differential capacity‐potential curves on activated platinum electrodes were obtained in nitrate and chloride solutions of various pH and under conditions of constant ionic strength. The maxima obtained are explained in terms of adsorption‐desorption processes. The results suggest that the transition from discharge to discharge occurs at a pH of 3–4. Chloride ion inhibits the formation of an oxygen‐containing layer on the electrode surface, and this inhibiting effect is greater for low pH and high chloride ion concentration. Some evidence is given which substantiates that the zero point of charge of platinum is at −0.05v on the saturated calomel scale.

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