Arulraj, I. and Venkateswararao, K. and Venkatesan, V.K. (1986) Towards fuel cell and metal air battery development - part-I The mechanism of oxygen reduction at lanthanum manganate-based perovskite-type oxides in alkaline solution. Bulletin of Electrochemistry , 2 (2). pp. 157-162. ISSN 0256-1654

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Abstract

The eledrocatalysis of oxygen reduction readion by lanthanum strontium manganate (La,, Sr,, MnO,) (LSM), lanthanum calcium manganate (Lao,5 Ca,, MnOd (LCM) and lanthanum barium manganate (La,,Ba,,MnO3 (LBM) has been studied by linear sweep cydic voltammetry using rotating ringdisc electrode technique in alkaline medium. From the ringdisc data and other kinetic parameters it has been assumed that oxygen redudion occurs by dissociative chernisorption at low werpotentials. At higher overpotentials the formation of hydrogen peroxide has been observed on these electrocatalysts. The apparent exchange current density values for oxygen redudion on LSM. LCM and LBM have been found to be 2x lo-', 5x 10-'and 4x 10-~~crnre-s~pe ctively, while the corresponding Talel slopes are 0.100, 0.1 15 and 0.1 15 V per decade. The possible readion mechanism lor eledroiedudion of oxygen on these oxide catalysts has been discussed.

Item Type:	Article
Uncontrolled Keywords:	Fuel cell; Metal-air battery; Lanthanum manganate; Perovskite-type oxides; Mechanism of oxygen reduction
Subjects:	Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	15 Mar 2012 12:31
Last Modified:	15 Mar 2012 12:31
URI:	http://cecri.csircentral.net/id/eprint/2052

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