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Electrocatalytic Studies of Oxygen Reduction by Lanthanum Barium Manganate

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Abstract:

The electrocatalysis of the oxygen reduction reaction by Lanthanum Barium Manganate, (La0.5Ba0.5MnO3) (LBM) has been studied by cyclic voltammetry using the rotating ring-disc electrode technique (RRDE) in alkaline medium. From the ring-disc data and other kinetic parameters it has been assumed that the oxygen reduction occurs by dissociative chemisorption at low overpotentials. At higher overpotentials, the formation of hydrogen peroxide (HO2 - in this case) has been observed on this electrocatalyst. The apparent exchange current density value for oxygen reduction on LBM has been found to be 4 x 10-8 Acm-2, while the corresponding Tafel slope is 0.115 V per decade. The possible reaction mechanism for electroreduction of oxygen on this oxide catalyst has been discussed.

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Periodical:

Defect and Diffusion Forum (Volumes 258-260)

Pages:

327-332

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.258-260.327

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Online since:

October 2006

Authors:

Diogo M.F. Santos, César A.C. Sequeira

Keywords:

Fuel Cell (FC), HO2-Disproportionation, Lanthanum Barium Manganate, Metal-Air Battery, Oxygen Reduction

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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