Cobalt tetraphosphate as an efficient bifunctional electrocatalyst for hybrid sodium-air batteries

Murugesan, C and Panjalingam, SP and Lochab, S and Rai, RK and Zhao, X and Singh, D and Ahuja, R and Barpanda, P (2021) Cobalt tetraphosphate as an efficient bifunctional electrocatalyst for hybrid sodium-air batteries. In: Nano Energy, 89 .

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Abstract

Economic and efficient bifunctional electrocatalysts are pivotal in realization of rechargeable (hybrid) metal-air batteries. It is ideal to employ noble-metal free bifunctional electrocatalysts that are not selective towards oxygen evolution and reduction (OER and ORR) activities. This work unveils cobalt-based tetraphosphate K2Co(PO3)4 as an economic bifunctional electrocatalyst acting as cathode for rechargeable hybrid sodium-air batteries. Autocombustion route led to the development of homogeneous, carbon-coated, spherical K2Co(PO3)4 nanoparticles enabling active site exposure to incoming guest molecules (O2, OH-). This monoclinic compound exhibited superior oxygen evolution activity with low overpotential (ca. 0.32 V) surpassing the commercial RuO2 catalyst. Tetraphosphate K2Co(PO3)4 was successfully implemented in hybrid Na-air batteries delivering reversible cycling with roundtrip efficiency over 70. DFT study revealed this catalytic activity stem from the most active and stable surface (001) and half-metallic nature of Co in K2Co(PO3)4. Cobalt tetraphosphates can be harnessed to design low cost electrocatalysts for hybrid sodium-air batteries. © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Nano Energy
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Cobalt compounds; Design for testability; Electrocatalysts; Electrolysis; Oxygen; Precious metals; Ruthenium compounds; Sodium; Sodium compounds; Solid electrolytes, Auto combustion; Bifunctional electrocatalysts; Cobalt-based; Hybrid na-air battery; Metal free; OER; Oxygen evolution; Oxygen Reduction; Sodium superionic conductor (NASICON); Super ionic conductors, Catalyst activity
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	28 Nov 2021 06:03
Last Modified:	28 Nov 2021 06:03
URI:	http://eprints.iisc.ac.in/id/eprint/70272

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