Voltammetric and electrogravimetric study of manganese dioxide thin film electrodes. Part 1. Electrodeposited films

Voltammetry and electrochemical quartz crystal microbalance (EQCM) studies of MnO 2 films electrodeposited in acidic media at 85°C show the existence of matter exchange during repeated electrochemical reduction and oxidation in 1 M KOH solution. Usually, these reactions are written without mentionin...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 1997-01, Vol.420 (1), p.159-165
Main Authors: Wu, B.L., Lincot, D., Vedel, J., Yu, L.T.
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Electrodes: preparations and properties
EQCM
Exact sciences and technology
General and physical chemistry
Manganese dioxide
Other electrodes
Voltammetry
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Summary:Voltammetry and electrochemical quartz crystal microbalance (EQCM) studies of MnO 2 films electrodeposited in acidic media at 85°C show the existence of matter exchange during repeated electrochemical reduction and oxidation in 1 M KOH solution. Usually, these reactions are written without mentioning the exchange of matter. The following are observed: a reversible exchange involving water between the crystal lattice and the solution within each successive sweep potential cycle; an irreversible mass loss caused by low dissolution and slow diffusion of Mn(III) and Mn(II) solubilized species; an irreversible large mass gain during the first cycle due to additional hydration of the material.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(96)04795-X