Synthesis and Electrochemical Properties of Nanophase MnO2by Solid-phase Reaction(Ⅰ)──Synthesis and Characterization of Nanophase γ-MnO2

Abstract

Abstract: Manganese acetate was complexed with citric acid, oxalic acid and 8-hydroxyquinoline respectively in solid state.The resulted complex precursors were thermally decomposited and then treated with acid to obtain nanophase γ-MnO₂.Their physical properties were characterized and discussed by elementary analysis, XRD, chemical analysis, TEM and TG/DTA tests.The particle sizes of samples are about 20-30 nm and their shapes are spherical-like from TEM images.The acid treatment made the oxidition of mangnese dioxide increase but nanophase samples have a little of agglomeration, the process of the acid treatment seemed to be crystalization, and the partic1es may be directional growth.The reason that nanophase materials could be systhesized with solid state reactions under the condition of room temperature or low heating was discussed.

Key words: Solid state reaction, Nanophase material, γ-Mangnese dioxide

CLC Number:

O643.13

TrendMD:

LI Juan, XIA Xi, LI Qing-Wen. Synthesis and Electrochemical Properties of Nanophase MnO₂by Solid-phase Reaction(Ⅰ)──Synthesis and Characterization of Nanophase γ-MnO₂[J]. Chem. J. Chinese Universities, 1999, 20(9): 1434.

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Synthesis and Electrochemical Properties of Nanophase MnO₂by Solid-phase Reaction(Ⅰ)──Synthesis and Characterization of Nanophase γ-MnO₂

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