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An oxygen evolution Co-Ac catalyst - the synergistic effect of phosphate ions

Irshad, Ahamed and Munichandraiah, Nookala (2014) An oxygen evolution Co-Ac catalyst - the synergistic effect of phosphate ions. In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16 (11). pp. 5412-5422.

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Official URL: http://dx.doi.org/10.1039/c3cp54860k

Abstract

Formation of an amorphous cobalt based oxygen evolution catalyst called Co-Pi has been recently reported from a neutral phosphate buffer solution containing Co2+. But the concentration of Co2+ is as low as 0.5 mM due to poor solubility of a cobalt salt in phosphate medium. In the present study, a cobalt acetate based oxygen evolution catalyst (Co-Ac) is prepared from a neutral acetate buffer solution, where the solubility of Co2+ is very high (>100 times in comparison with phosphate buffer solution). The Co-Ac possesses better catalytic activity than the Co-Pi with an additional advantage of easy bulk scale preparation. The comparative studies on the oxygen evolution reaction (OER) activity of Co-Ac and Co-Pi in phosphate and acetate buffer electrolytes reveal that the Co-Ac exhibits enhanced synergistic catalytic activity in phosphate solution, probably due to partial substitution of acetate in the catalyst layer by phosphate, resulting in the formation of a Co-Ac-Pi catalyst.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, ENGLAND
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 01 May 2014 08:55
Last Modified: 01 May 2014 08:56
URI: http://eprints.iisc.ac.in/id/eprint/48928

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