ChemInform Abstract: The Influence of Potassium Ion on the Electrodeposition and Electrochemistry of Electrolytic Manganese Dioxide.

Abstract

The Influence of Potassium Ion on the Electrodeposition and Electrochemistry of Electrolytic Manganese Dioxide.-Electrolytic MnO2 is prepared in the presence of varying amounts of K+ in the electrodeposition bath. Depending on the K+ concentration in the bath, the acid concentration, and the current density, incorporation of 54-5150 ppm K+ is observed. The incorporation of K+ is accompanied by the formation of α-MnO2 as a minor component along with the usual γ-MnO2. Even small amounts of the αphase (¿ 3%) have observable effects on the electrochemical reduction of MnO2. Changes in the cathodic peaks can be correlated with the increase in the amount of α-MnO2. These parallel the decreased voltages observed during reduction as the α-MnO2 content increases. -(KAO, W.-H.; WEIBEL, V. J.; ROOT, M. J.; J.