Abstract
A study has been made of the influence of potassium silicate upon the dissolution reaction of polycrystalline zinc in potassium hydroxide solution. Evidence is presented confirming previous conclusions that potassium silicate is strongly adsorbed on metallic zinc at potentials close to the dissolution potential. This results in inhibition of zinc dissolution as the interaction of OH with the metal surface is restricted. The adsorbed layer of silicate also effects the movement of ionic species in the close vicinity of the electrode surface. The amount of charge needed to cause passivation is then by reduced. The beneficial effect of silicate in certain power storage applications is a bulk solution phenomenon.
Published Version
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