Electrocatalysis of oxygen reduction by lanthanum-strontium manganate |
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Authors: | C. A. C. Sequeira D. M. F. Santos P. S. D. Brito |
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Affiliation: | (1) Department of Chemical and Biological Engineering, Instituto Superior Tecnico, Technical University of Lisbon (TULisbon), Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal;(2) Escola Superior de Tecnologia e Gestao de Portalegre, Apartado 148, 7300-901 Portalegre, Portugal |
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Abstract: | The electrocatalysis of the oxygen reduction reaction by lanthanum-strontium manganate La0.5Sr0.5MnO3 (LSM) 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 was concluded that the oxygen reduction occurs by dissociative chemisorption at low overpotentials. At higher overpotentials, the formation of hydrogen peroxide (HO2− in this case) on the electrocatalyst has been observed. The apparent exchange current density for oxygen reduction on LSM has been found to be 2 × 10−7 A cm−2, while the corresponding Tafel slope is 0.100 V per decade. The possible reaction mechanism for electroreduction of oxygen on this oxide catalyst has been discussed. Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 7, pp. 919–923. The text was submitted by the authors in English. |
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Keywords: | fuel cell metal-air battery lanthanum-strontium manganate oxygen reduction electrocatalysis |
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