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January 1, 1968Journal of The Electrochemical Society

Cathodic Polarization of the Manganese Dioxide Electrode in Alkaline Electrolytes

Akiya Kozawa R. A. Powers

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Abstract

Polarization of β ‐ and γ ‐ MnO 2 is measured at various constant currents in 9 M KOH and KOD electrolytes in reduction from MnO 2 to Mn ( OH ) 2 . Two limiting currents are observed in high‐current discharges of γ ‐ MnO 2 , one around MnO 1.75 and the other after MnO 1.5 . The former is attributed to formation of a lower oxide structure on the surface of γ ‐ MnO 2 structure. Around MnO 1.9 , a Tafel relation is observed for γ ‐ MnO 2 and i 0 values are obtained. The polarization is always greater in 9 M KOD than in 9 M KOH under the same discharge conditions.

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Kozawa et al. (1968) studied this question.

synapsesocial.com/papers/6ac9d7dcb6274a20d738cae9 https://doi.org/10.1149/1.2411042

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