NDLI: Oxygen reduction at a manganate electrocatalyst in KOH solutions

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Oxygen reduction at a manganate electrocatalyst in KOH solutions

Content Provider	Scilit
Author	Sequeira, César A. C. Santos, Diogo M. F. Baptista, Walmar
Copyright Year	2006
Description	The electrocatalysis of the oxygen reduction reaction by lanthanum calcium manganate, (La0.5Ca0.5MnO3) (LCM) 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 LCM has been found to be 5 ´ 10-8 A cm-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.
Related Links	http://www.scielo.br/pdf/jbchs/v17n5/13.pdf http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0103-50532006000500014&lng=en&nrm=iso&tlng=en
Ending Page	914
Page Count	5
Starting Page	910
ISSN	01035053
e-ISSN	16784790
DOI	10.1590/s0103-50532006000500014
Journal	Journal of the Brazilian Chemical Society
Issue Number	5
Volume Number	17
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	2006-10-01
Access Restriction	Open
Subject Keyword	Journal of the Brazilian Chemical Society air Battery Lanthanum Calcium Manganate Disproportionation
Content Type	Text
Resource Type	Article
Subject	Chemistry

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