Issue 4, 2022

Structural, electronic, and electrocatalytic evaluation of spinel transition metal sulfide supported reduced graphene oxide

Abstract

Development of highly active and durable non-precious spinel transition metal sulfide (STMS)-based electrocatalysts plays a vital role in increasing the efficiency of hydrogen production via water electrolysis. Herein, we have synthesized a hierarchical nanostructured ZnCo2S4 on reduced graphene oxide (ZCS@rGO) sheet using a cost-effective hydrothermal synthesis method. The prepared ZCS@rGO shows improved hydrogen desorption and adsorption energy of the electrocatalyst surface towards efficient hydrogen evolution reaction (HER). As a result, ZCS@rGO showed lower HER overpotential (η10 = 135 eV) and Tafel slope (47 mV dec−1) and superior durability at 10 mA cm−2 for 36 h, as compared to the benchmark catalyst of Pt–C. Further, the electronic structure and HER mechanism of the ZCS@rGO catalyst were investigated by density functional theory calculations. This work provides a new pathway for the rational design of highly active and durable non-precious STMS-based electrocatalysts for hydrogen production.

Graphical abstract: Structural, electronic, and electrocatalytic evaluation of spinel transition metal sulfide supported reduced graphene oxide

Supplementary files

Article information

Article type
Paper
Submitted
24 sept. 2021
Accepted
24 déc. 2021
First published
25 déc. 2021

J. Mater. Chem. A, 2022,10, 1999-2011

Structural, electronic, and electrocatalytic evaluation of spinel transition metal sulfide supported reduced graphene oxide

R. Santhosh Kumar, S. Ramakrishnan, S. Prabhakaran, A. R. Kim, D. R. Kumar, D. H. Kim and D. J. Yoo, J. Mater. Chem. A, 2022, 10, 1999 DOI: 10.1039/D1TA08224H

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