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Issue 13, 2020
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Self-supported fabrication and electrochemical water splitting study of transition-metal sulphide nanostructured electrodes

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Abstract

Design of efficient, low-cost and durable water splitting electrocatalyst is a central to the field of electrochemical energy conversion and storage technologies. Herein, we report a facile fabrication of a variety of nanostructured transition metal sulphides (iron sulphides (FeS), cobalt sulphides (CoS), nickel sulphides (NiS), and copper sulphides (CuS)) on a bare nickel foam (NiF) substrate via a one-step electrochemical strategy. The fabricated FeS, CoS, NiS and CuS nanostructures were effectively employed as potential electrodes for enhanced oxygen evolution reaction (OER) in presence of an alkaline electrolyte (1.0 M KOH). Our primary electrocatalytic OER study reveals that the FeS nanostructures exhibited the best activity in terms of low onset potential (∼1.51 V vs. RHE), small over-potential (η) (∼0.32 V@10 mA cm−2), and Tafel slope (∼0.069 V dec−1), and high durability in comparison to the CoS, NiS and CuS nanostructures. A unique three-dimensional sheet-like morphology, high electrochemical active surface area (ECASA), low electrochemical impedance characteristics, rapid electron-transfer kinetics, and high structural solidity enable this novel FeS nanomaterial to be a distinct and promising electrode material for the OER activity. Thus, the complete electrocatalytic OER activity of the transition metal sulphide nanostructures follows the order: FeS > CoS > NiS > CuS. Our results on the optimized design of transition metal sulphide-derived electrodes based on the chemical composition, surface morphology, abundant active sites, etc., would further improve the OER activity for water electrolysis.

Graphical abstract: Self-supported fabrication and electrochemical water splitting study of transition-metal sulphide nanostructured electrodes

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Supplementary files

Article information


Submitted
13 Jan 2020
Accepted
23 Feb 2020
First published
24 Feb 2020

New J. Chem., 2020,44, 5071-5078
Article type
Paper

Self-supported fabrication and electrochemical water splitting study of transition-metal sulphide nanostructured electrodes

A. Shankar, R. Elakkiya and G. Maduraiveeran, New J. Chem., 2020, 44, 5071
DOI: 10.1039/D0NJ00192A

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