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Formation of Manganese(II) Ion in the Discharge of the Manganese Dioxide Electrode

1955; Institute of Physics; Volume: 102; Issue: 10 Linguagem: Inglês

10.1149/1.2429912

1945-7111

A. M. Chreitzberg, D. R. Allenson, W. C. Vosburgh,

Analytical Chemistry and Sensors

In the discharge of electrodeposited manganese dioxide electrodes in ammonium chloride electrolyte at PH 7, very little manganese(II) ion enters the solution during the first third of the discharge, but it appears at an increasing rate thereafter. The effects of current density, PH, ammonium chloride concentration, and interruption of the discharge were studied. A mechanism is suggested involving the assumptions that the electrode reaction takes place on the exterior surface of the manganese dioxide and that the primary product is a lower oxide, which reacts with the electrolyte to give the manganese(II) ion formed. Additional evidence is presented for the first assumption.