Potassium Cobalt Pyrophosphate as a Nonprecious Bifunctional Electrocatalyst for Zinc-Air Batteries

Sada, K and Gond, R and Bothra, N and Pati, SK and Barpanda, P (2022) Potassium Cobalt Pyrophosphate as a Nonprecious Bifunctional Electrocatalyst for Zinc-Air Batteries. In: ACS Applied Materials and Interfaces, 14 (7). pp. 8992-9001.

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Abstract

Economic and sustainable (ecological) energy storage forms a major pillar of the global energy sector. Bifunctional electrocatalysts, based on oxygen electrolysis, play a key role in the development of rechargeable metal-air batteries. Pursuing precious metal-free economic catalysts, here, we report K2CoP2O7 pyrophosphate as a robust cathode for secondary zinc-air batteries with efficient oxygen evolution and oxygen reduction (OER||ORR) activity. Prepared by autocombustion, nanoscale K2CoP2O7 exhibited excellent oxygen reduction and evolution reactions among all phosphate-based electrocatalysts. In particular, the OER activity surpassed that of commercial RuO2 with low overpotential (0.27 V). First-principles calculations revealed that the bifunctional activity is rooted in the Co active site with the CoO5 local coordination in the most stable (110) surface. This nanostructured (tetragonal) pyrophosphate can be harnessed as an economic bifunctional catalyst for zinc-air batteries. © 2022 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Materials and Interfaces
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society.
Keywords:	Calculations; Cobalt compounds; Electrocatalysts; Electrolysis; Electrolytic reduction; Oxygen; Potassium compounds; Zinc; Zinc air batteries; Zinc compounds, Bifunctional electrocatalysts; Cobalt pyrophosphate; Energy sector; Global energy; Metal free; OER; Oxygen evolution; Oxygen Reduction; Zinc-air battery; ]+ catalyst, Ruthenium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	10 Mar 2022 07:32
Last Modified:	15 Jun 2022 05:34
URI:	https://eprints.iisc.ac.in/id/eprint/71531

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