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Reação de geração de oxigênio em eletrodos de Mn2O3 suportados em aço inoxidável

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Author(s): Varela Hamilton | Câmara Giuseppe A. | Scatena Júnior Hélio | Gonzalez Ernesto R.

Journal: Química Nova
ISSN 0100-4042

Volume: 23;
Issue: 6;
Start page: 721;
Date: 2000;
Original page

Keywords: oxygen evolution | ceramic electrodes | electrocatalysis

ABSTRACT
A study of the kinetics of oxygen evolution in alkaline conditions from ceramic films of Mn2O3 supported on stainless steel was carried out. This study has been done through the determination of transfer coefficients, Tafel slopes and exchange currents using potentiodynamic and quasi-potentiostatic measurements. The activation energy was determined as a function of the overpotential and, additionally, the electrode active surface was estimated. The results are consistent with data already published for other electrodes, implying that the methods used in this work were reliable and precise.
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