Abstract
The differential capacitance of the polycrystalline zinc electrode has been studied in aqueous solutions of KCl, KNO 3 and KOH both with and without the addition of potassium silicate. Double layer capacitance measurements can be made in KCl and KNO 3 without the interaction of OH − at low pH values < 3.0. The reduction of the nitrate ion takes place at the zinc electrode in aqueous potassium nitrate. The silicate ion is adsorbed on the zinc electrode in aqueous KOH solutions at a potential close to the dissolution potential. This results in inhibition of metal dissolution, due to limited interaction of OH − with the metal surface. The electrode resistance is increased by this adsorbed layer of silicate ion. In alkaline solution the h.e.r. is stimulated by the addition of potassium silicate.
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