Russian Journal of Electrochemistry

, Volume 44, Issue 7, pp 852–856 | Cite as

Electrocatalysis of oxygen reduction by lanthanum-strontium manganate

  • C. A. C. Sequeira
  • D. M. F. Santos
  • P. S. D. Brito


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 (HO 2 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.

Key words

fuel cell metal-air battery lanthanum-strontium manganate oxygen reduction electrocatalysis 


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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • C. A. C. Sequeira
    • 1
  • D. M. F. Santos
    • 1
  • P. S. D. Brito
    • 2
  1. 1.Department of Chemical and Biological Engineering, Instituto Superior TecnicoTechnical University of Lisbon (TULisbon)LisboaPortugal
  2. 2.Escola Superior de Tecnologia e Gestao de PortalegrePortalegrePortugal

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