Electrocatalysis of oxygen reduction by lanthanum-strontium manganate

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Sequeira, CAC (Autor) Outra; Brito, PSD (Autor) Outra

Revista

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Título: RUSSIAN JOURNAL OF ELECTROCHEMISTRY

Vol. 44

Páginas: 852-856

ISSN: 1023-1935

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-003-YCY

DOI: 10.1134/s1023193508070136

Abstract (EN): The electrocatalysis of the oxygen reduction reaction by lanthanum-strontium manganate La0.5Sr0.5 MnO3 (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 x 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5