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Magnesium cobalt silicate as a bifunctional catalyst for the O-2 electrode and its application in Li-O-2 cells

Kumar, Surender and Munichandraiah, N (2016) Magnesium cobalt silicate as a bifunctional catalyst for the O-2 electrode and its application in Li-O-2 cells. In: CATALYSIS SCIENCE & TECHNOLOGY, 6 (17). pp. 6716-6725.

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Official URL: http://dx.doi.org/10.1039/c6cy00029k

Abstract

Magnesium cobalt silicate (MgCoSiO4) is investigated for the oxygen evolution reaction (OER). It is synthesized by a mixed solvothermal approach and characterized by physicochemical techniques. Cubic shaped particles of MgCoSiO4 are observed in microscopy images. The catalytic activity of MgCoSiO4 is studied in alkaline (KOH solution) and neutral (phosphate buffer solutions) media. The effects of the electrolyte concentration and loading level on OER are studied. Additionally, the oxygen reduction reaction (ORR) of MgCoSiO4 is studied in aqueous and non-aqueous electrolytes. Oxygen follows the 4e(-) and 1e(-) reduction pathways in aqueous and non-aqueous electrolytes, respectively. Li-O-2 cells are assembled with MgCoSiO4 as the oxygen electrode catalyst in non-aqueous electrolyte and subjected to charge-discharge cycling at several current densities. A discharge capacity of 7221 mA h g(-1) (8.272 mA h cm(-2)) was obtained at 0.3 mA cm(-2). The results suggest that MgCoSiO4 is a good non-platinum based catalyst, which is useful for Li-O-2 cells.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 22 Oct 2016 09:11
Last Modified: 22 Oct 2016 09:11
URI: http://eprints.iisc.ac.in/id/eprint/54987

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