Electrodeposited Nickel-Cobalt-Sulfide Catalyst for the Hydrogen Evolution Reaction

Irshad, Ahamed and Munichandraiah, Nookala (2017) Electrodeposited Nickel-Cobalt-Sulfide Catalyst for the Hydrogen Evolution Reaction. In: ACS APPLIED MATERIALS & INTERFACES, 9 (23). pp. 19746-19755.

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Abstract

A novel Ni-Co-S-based material prepared by the potentiodynamic deposition from an aqueous solution containing Ni2+, Co2+, and thiotirea is studied as an electrocatalyst for the hydrogen evolution reaction (HER) in a neutral phosphate solution. The composition of the catalyst and the HER activity are tuned by Varying the ratio of the concentrations of Ni2+ and Co2+ ions in the electrolytes. Under optimized deposition conditions, the bimetallic Ni-Co-S exhibits higher electro-catalytic activity than its monometallic counterparts. The Ni-Co-S catalyst requires an overpotential of 150 mV for the HER onset, and 10 mA cm(-2) current density is obtained at 280 mV overpotential. The catalyst exhibits two different Tafel slopes (93 and 70 inV dec(-1)) indicating two dissimilar mechanisms. It is proposed that the catalyst comprises two types of catalytic active sites, and they contribute selectively toward HER in different potential regions.

Item Type:	Journal Article
Publication:	ACS APPLIED MATERIALS & INTERFACES
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	14 Jul 2017 10:31
Last Modified:	14 Jul 2017 10:31
URI:	http://eprints.iisc.ac.in/id/eprint/57388

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