Stimulus of Work Function on Electron Transfer Process of Intermetallic Nickel�Antimonide Toward Bifunctional Electrocatalyst for Overall Water Splitting

Mariappan, VK and Krishnamoorthy, K and Pazhamalai, P and Swaminathan, R and Kim, S-J (2024) Stimulus of Work Function on Electron Transfer Process of Intermetallic Nickel�Antimonide Toward Bifunctional Electrocatalyst for Overall Water Splitting. In: Small .

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Abstract

Engineering the intermetallic nanostructures as an effective bifunctional electrocatalyst for hydrogen and oxygen evolution reactions (HER and OER) is of great interest in green hydrogen production. However, a few non-noble metals act as bifunctional electrocatalysts, exhibiting terrific HER and OER processes reported to date. Herein the intermetallic nickel�antimonide (Ni�Sb) dendritic nanostructure via cost-effective electro-co-deposition method is designed and their bifunctional electrocatalytic property toward HER and OER is unrevealed. The designed Ni�Sb delivers a superior bifunctional activity in 1 m KOH electrolyte, with a shallow overpotential of �119 mV at -10 mA for HER and �200 mV at 50 mA for OER. The mechanism behind the excellent bifunctional property of Ni�Sb is discussed via �interfacial descriptor� with the aid of Kelvin probe force microscopy (KPFM). This study reveals the rate of electrocatalytic reaction depends on the energy required for electron and proton transfer from the catalyst's surface. It is noteworthy that the assembled Ni�Sb-90 electrolyzer requires only a minuscule cell voltage of �1.46 V for water splitting, which is far superior to the art of commercial catalysts. © 2024 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Small
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Cost effectiveness; Deposition; Electrocatalysis; Electrocatalysts; Electrolytes; Electron transport properties; Hydrogen production; Intermetallics; Nickel; Nickel compounds; Potassium hydroxide; Work function, Antimonides; Bifunctional electrocatalysts; Descriptors; HER; Interfacial descriptor; Intermetallic nanostructure; Kelvin probe force microscopy; Nickel�antimonide; OER; Water splitting, Nanostructures
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	03 Jun 2024 05:46
Last Modified:	03 Jun 2024 05:46
URI:	https://eprints.iisc.ac.in/id/eprint/85135

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