Two-Dimensional, Few-Layer Phosphochalcogenide, FePS3: A New Catalyst for Electrochemical Hydrogen Evolution over Wide pH Range

Mukherjee, Debdyuti and Austeria, Muthu P and Sampath, S (2016) Two-Dimensional, Few-Layer Phosphochalcogenide, FePS3: A New Catalyst for Electrochemical Hydrogen Evolution over Wide pH Range. In: ACS ENERGY LETTERS, 1 (2). pp. 367-372.

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Abstract

A layered MPS3-type compound, FePS3, is introduced as an electrocatalyst for hydrogen evolution reaction (HER). The non-noble metal-based FePS3 is a semiconductor that could be solvent exfoliated into few-layer, two-dimensional (2D) nanosheets. The 2D thin sheets exhibit very good catalytic activity and stability toward HER over a wide pH range of acidic, alkaline, phosphate buffer, and 3.5 wt % aqueous NaCl solutions. The Tafel slope and exchange current density in acidic medium are determined to be similar to(45-50) mV dec(-1) and 1 +/- 0.2 x 10(-3) A cm(-2), respectively. The stability of the catalyst is found to be very good. Density functional theory calculations reveal P and S as favorable hydrogen adsorption sites. This material opens up a new class of ternary, layered semiconductors for various electrocatalytic studies and might also become important from a device physics point of view.

Item Type:	Journal Article
Publication:	ACS ENERGY LETTERS
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:	20 Jan 2017 04:23
Last Modified:	20 Jan 2017 04:23
URI:	http://eprints.iisc.ac.in/id/eprint/55927

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