Metal fluorophosphate polyanionic insertion hosts as efficient bifunctional electrocatalysts for oxygen evolution and reduction reactions

Sharma, L and Bothra, N and Rai, RK and Pati, S and Barpanda, P (2020) Metal fluorophosphate polyanionic insertion hosts as efficient bifunctional electrocatalysts for oxygen evolution and reduction reactions. In: Journal of Materials Chemistry A, 8 (36). pp. 18651-18658.

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Abstract

Metal-air batteries with high energy density have emerged as key players in the energy storage sector. They operate on two underlying processes, namely, the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). It provides the impetus to design efficient, earth-abundant and economic bifunctional electrocatalystsvis-à -visprecious metal-based catalysts. In this perspective, a few polyanionic battery insertion materials have been reported as potential electrocatalysts. In the current work, metal fluorophosphate (Na2MPO4F, M = Fe/Co/Mn) family of sodium insertion materials have been shown as a new class of bifunctional electrocatalysts with robust structural stability. In particular, Na2CoPO4F was found to exhibit superior catalytic performance with an onset potential of 0.903 V (vs.RHE) for the ORR and an overpotential of 380 mV (vs.RHE) for the OER. The underlying mechanism and kinetics were explored usingab initiocomputational studies. Overall, polyanionic transition metal fluorophosphates were explored for the first time as bifunctional electrocatalysts capable of working as potential cathode materials in hybrid metal-air batteries. © The Royal Society of Chemistry 2020.

Item Type:	Journal Article
Publication:	Journal of Materials Chemistry A
Publisher:	Royal Society of Chemistry
Additional Information:	Copyright for this article belongs to the Royal Society of Chemistry
Keywords:	Cathodes; Cobalt compounds; Electrocatalysts; Electrolysis; Electrolytic reduction; Energy storage; Fluorine compounds; Hybrid materials; Metal working; Metal-air batteries; Oxygen; Oxygen evolution reaction; Oxygen reduction reaction; Sodium compounds; Stability; Transition metals, Bifunctional electrocatalysts; Catalytic performance; High energy densities; Insertion materials; Mechanism and kinetics; Metal-based catalysts; Oxygen evolution reaction (oer); Structural stabilities, Phosphorus compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	13 Mar 2021 09:03
Last Modified:	13 Mar 2021 09:03
URI:	http://eprints.iisc.ac.in/id/eprint/66748

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