Synthesis and Electrochemical Properties of Nanophase MnO2by Solid-phase Reaction(Ⅱ)--Electrochemical Properties of Nanophase γ-MnO2

Abstract

Abstract: The electrochemical behavior of nanophase γ-MnO₂produced by the decomposition of coordination compound precursors and then acid treatment was investigated by using cyclic voltammetry and constant current charge/discharge tests. The results indicated that the nanophase γ-MnO₂has a better electrochemical activity than International Common Sample 1(electrolytic mangnese dioxide, abbreviated in S). Their discharge capacities were higher than that of Sespecially at the second discharge step. This favorable performance was more remarkable under the condition of heavy load discharge. Arelatively strong polarization was shown at the beginning of the discharge stage and then strong depolarizable ability in the following stage. CV curves show that the peak current of nanophase MnO₂is obviously larger than that of S, and it can be concluded that insertion and deinsertion for protons into the tunnels of crystal lattice of nanophase mangnese dioxide are easier than Safter-0.2 V, and dissolution and deposition for Mn(Ⅲ) and Mn(Ⅱ) species are also easier in nanophase MnO₂than in Sin the second discharge step.

Key words: Nanophase electrode material, γ-Manganese dioxide, Cyclic voltammetry, Constant current discharge, Discharge capacity

CLC Number:

O646.5

TrendMD:

XIA Xi, LI Juan, LI Qing-Wen . Synthesis and Electrochemical Properties of Nanophase MnO₂by Solid-phase Reaction(Ⅱ)--Electrochemical Properties of Nanophase γ-MnO₂[J]. Chem. J. Chinese Universities, 1999, 20(10): 1584.

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Synthesis and Electrochemical Properties of Nanophase MnO₂by Solid-phase Reaction(Ⅱ)--Electrochemical Properties of Nanophase γ-MnO₂

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