Abstract
Freshly prepared 37% potassium hydroxide was exposed to the atmosphere. Samples were taken periodically to measure amount of absorbed CO2 and their specific conductance. After exposure for 10 months, the solution was virtually neutralized by absorption of CO2. Effects of CO2 content and KOH concentration on the discharge characteristics of the silver-zinc cell were tested. Discharge capacity was decreased when CO2 content reached beyond 3%, and KOH concentration dropped to below 30%. Polarization experiments on silver oxide and zinc electrodes showed that only the zinc electrode was affected. Observation of the current-time behaviour lead to the equation (i-i 1)=kt p −1/2 , and X-ray diffraction showed that the passivation layer was ZnO.
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