Preparation of Manganese Dioxide for Oxygen Reduction in Zinc Air Battery by Hydro thermal Method

doi:10.3724/SP.J.1077.2012.12474

Abstract

Abstract: δ-MnO₂, α-MnO₂ and β-MnO₂ nano-particles were obtained by a hydrothermal method with changing molar ratios of K⁺/H⁺ at low temperature of 180℃, and the molar ratios of K⁺/H⁺were 3.4, 0.85 and 0.24, respectively. The as-prepared samples were characterized by SEM, XRD, FTIR, BET, TG and electrochemical method. The results indicate that the concentrations of K⁺ ion and H⁺ ion have great effects on the crystalline structures, morphology and specific surface area of the as-prepared products. Among the three as-prepared samples used as cathodic materials in zinc air battery, the rate performances of the δ-MnO₂ and α-MnO₂are superior to that of the as-prepared β-MnO₂. The oxygen reduction currents of δ-MnO₂, α-MnO₂, and β-MnO₂ at –0.35 V are 56.28, 56.01 and 40.88 mA/cm², respectively.

Key words: oxygen reduction, manganese dioxide, hydro thermal method, zinc air battery

CLC Number:

HUANG You-Ju, LI Wei-Shan. Preparation of Manganese Dioxide for Oxygen Reduction in Zinc Air Battery by Hydro thermal Method[J]. Journal of Inorganic Materials, 2013, 28(3): 341-346.

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