Effect of Mechanical Activation on the Electrochemical Behavior of MnO₂

Abstract:

Electrochemical behaviour of mechanoactivated β-MnO₂ powders has been studied by the method of cyclic voltammetry with a carbon-paste electroactive electrode. Mechanical activation was carried out by dry grinding in an AGO-2 planetary ball mill. It was found that the grinding process results in a mechanochemical effect in the surface layer of the oxide particles: Mn (IV) cations are reduced to Mn (III). Voltammetry test detects that mechanical activation of β-MnO₂ leads to a new state, which is characteristic for the γ-modification of manganese dioxide (β-MnO₂ γ-MnO₂).

• Periodical: Defect and Diffusion Forum (Volumes 334-335)
• Pages: 369-374
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.334-335.369
• Online since: February 2013
• Authors: G.A. Kozhina, A.N. Ermakov, V.B. Fetisov, A.V. Fetisov, K. Y. Shunyaev, Andrey N. Dmitriev, S.A. Petrova, Robert Grigorievich Zakharov
• Keywords: Mechanical Activation, Oxide, Reductive Dissolution, Voltammetry

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