Promotion of Electrochemical Water Oxidation Activity of Au Supported Cobalt Oxide upon Addition of Cr: Insights using in situ Raman Spectroscopy

Das, A and Mohapatra, B and Kamboj, V and Ranjan, C (2021) Promotion of Electrochemical Water Oxidation Activity of Au Supported Cobalt Oxide upon Addition of Cr: Insights using in situ Raman Spectroscopy. In: ChemCatChem .

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Abstract

Mixed metal oxides based on cobalt oxide are important target material as water oxidation catalyst in alkaline media. Significant enhancement of electrochemical oxygen evolution activity was observed for Au supported cobalt oxide, upon addition of Cr. CoOx/Au and CoCrOx/Au were studied side by side to understand the effects of the addition of Cr in such a system. The presence of Cr resulted in a significant lowering of onset potentials �150 mV. In-situ Raman spectroscopy was used to characterize the material. The catalyst was found to develop into oxide entirely in situ. Cr was found to stabilize lower oxidation states of Co, both during catalyst formation and oxygen evolution. Isotopic substitution studies alongside in situ Raman Spectroscopy showed that OER onset potential strongly correlated with the appearance of metastable Au�OOH peak. © 2021 Wiley-VCH GmbH

Item Type:	Journal Article
Publication:	ChemCatChem
Publisher:	Wiley Blackwell
Additional Information:	The copyright of this article belongs to Wiley Blackwell
Keywords:	Catalysts; Chromium; Chromium metallography; Cobalt metallography; Gold; Gold compounds; Gold metallography; Oxidation; Oxygen; Raman spectroscopy, Electrochemical oxygen; In-situ Raman spectroscopy; Isotopic substitution; Mixed metal oxide; Onset potential; Oxygen evolution; Target materials; Water oxidation catalysts, Cobalt compounds
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	12 Mar 2021 15:56
Last Modified:	12 Mar 2021 15:56
URI:	http://eprints.iisc.ac.in/id/eprint/68373

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