Dey, Kajal Kumar and Jha, Shwetambara and Kumar, Arvind and Gupta, Govind and Srivastava, Avanish Kumar and Ingole, Pravin Popinand (2019) Layered vanadium oxide nanofibers as impressive electrocatalyst for hydrogen evolution reaction in acidic medium. Electrochimica Acta, 312. pp. 89-99. ISSN 0013-4686

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Abstract

Development of abundant and cost-effective electrocatalysts for hydrogen evolution reaction (HER) has gained momentum in recent years. In spite of being one of the largest class of materials, very few metal oxides have shown the propensity for HER in acidic medium. Herein, we report V10O24 center dot nH(2)O nanofibers as an excellent electrocatalyst material for HER for the first time. We show that V10O24 center dot nH(2)O nanostructures with a mixed V5+/V4+ oxidation state and a jute-fiber like morphology having a layered disposition and large interlayer spacing of 1.3 nm characterized by interlayer water molecules, can act as an excellent HER electrocatalyst in acidic medium. It required a low overpotential of 118 mV reaching to -10 mA cm(-2) current density and at 600 mV overpotential reached a current density of -405 mA cm(-2). It showed excellent durability retaining ca. 90% of its initial activity even after cycling for more than 11 h. Mechanism of the HER electrocatalysis was investigated by Tafel analysis that revealed typical Volmer-Heyrovsky mechanism for the HER with an excellent exchange current density of 1.62 mA cm(-2). The vanadium oxide catalyst was also explored as oxygen reduction reaction electrocatalyst for application in alkaline fuel-cells.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Electrochemistry
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	19 Aug 2026 11:24
Last Modified:	19 Aug 2026 11:24
URI:	https://npl.csircentral.net/id/eprint/4273

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