Electrochemical synthesis of beta- and gamma-manganese dioxides under hydrothermal conditions

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Abstract

The hydrothermal-electrochemical method has been used for the synthesis of manganese dioxides from acidic MnSO4 solutions. This method produced manganese dioxides of either the β- or γ-structure type. At pH 1 and 130°C, pure β-MnO2 was formed; this was the first time that this structure has been obtained electrochemically. At 113 or 92°C, mixtures of β- and γ-MnO2 were obtained, and the β-MnO2 content decreased with temperature. Increasing the acidity at 92°C led to the formation of pure γ-MnO2 with lower levels of pyrolusite intergrowth and microtwinning defects compared to γ-MnO2 prepared by traditional electrochemical syntheses.

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Hill, L. I., Portal, R., Le Gal La Salle, A., Verbaere, A., & Guyomard, D. (2001). Electrochemical synthesis of beta- and gamma-manganese dioxides under hydrothermal conditions. Electrochemical and Solid-State Letters, 4(6). https://doi.org/10.1149/1.1369217

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