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Title of Journal: J Appl Electrochem

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Abbravation: Journal of Applied Electrochemistry

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Springer Netherlands

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DOI

10.1007/bf00836297

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ISSN

1572-8838

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Chemical composition and electrochemical activity

Authors: Hemant Malankar S S Umare K Singh
Publish Date: 2009/09/03
Volume: 40, Issue: 2, Pages: 265-275
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Abstract

A series of γMnO2 with Mn4+ cation vacancy fraction 15  x  23 was prepared via chemical synthesis Xray diffraction XRD revealed high degree of microtwinning T w  70 and de Wolff disorder 032  P r  035 in the prepared samples Thermal analysis showed fourstage decomposition corresponding to the removal of physical water chemisorbed water formation of Mn2O3 and Mn3O4 respectively The chemical composition and physical properties of the prepared samples were expressed in terms of Ruetschi’s cation vacancy model for MnO2 The discharge behavior in 9 M KOH was governed by homogeneous solidstate reduction wherein protons and electrons were simultaneously inserted into MnO2 lattice Their electrochemical behavior was also studied by performing cyclic voltammetry in 9 M KOH An attempt was made to correlate obtained energy density as a function of proton transfer rate during the discharge process

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