Issue 7, 2024

Exploring the electrocatalytic prowess of a synergistic 1T-MoS2-metallic Ni composite towards alkaline hydrogen evolution

Abstract

Designing of suitable electrocatalysts for efficient alkaline hydrogen evolution reaction (HER) is a challenging task owing to the additional energy consumption to disintegrate the H–OH bond in the Volmer step. Under these circumstances, strong synergistic interactions between Ni/Co derivatives with 1T-MoS2 can frequently accelerate the alkaline HER. This study addresses the challenge of designing efficient electrocatalysts for the alkaline HER, focusing on minimizing additional energy consumption during the Volmer step. A composite structure, 1T-MoS2–Ni(18), was synthesized using 1T-MoS2 and metallic Ni for effective alkaline HER catalysis. Rigorous physical characterization confirmed the formation of an interfacial structure between 1T-MoS2 and metallic Ni. The resulting composite exhibited very good alkaline HER performance, requiring only a 120 mV overpotential for a standard 10 mA cm−2geo current density. The improved performance was attributed to feasible water dissociation over the metallic Ni promoter, facile electron migration kinetics through the interfacial structure, and enhanced per-site activity. In addition, for the practical execution of an alkaline electrolyzer, NiS nanoparticles were synthesized as an OER catalyst, exhibiting only a 310 mV overpotential (1.54 V vs. RHE) to attain a 10 mA cm−2geo current density. The alkaline electrolyzer, (NiS (+)||1T-MoS2–Ni(18) (−)), delivered a 1.68 V cell potential to sustain a 10 mA cm−2geo current density with excellent stability for up to 48 h.

Graphical abstract: Exploring the electrocatalytic prowess of a synergistic 1T-MoS2-metallic Ni composite towards alkaline hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
01 Dec 2023
Accepted
07 Feb 2024
First published
08 Feb 2024
This article is Open Access
Creative Commons BY license

Mater. Adv., 2024,5, 2805-2817

Exploring the electrocatalytic prowess of a synergistic 1T-MoS2-metallic Ni composite towards alkaline hydrogen evolution

A. Roy, A. Mondal, H. R. Inta, S. Ghosh, K. S. Paliwal, S. Debnath, A. A. Valsan and V. Mahalingam, Mater. Adv., 2024, 5, 2805 DOI: 10.1039/D3MA01077E

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