An Ag2S-engineered heterojunction enhances the overall water splitting efficiency of NiSx catalysts

Abstract

Ag2S/NiSx heterostructures are designed as efficient electrocatalysts for overall water splitting. Ag2S modifies the electronic structure and induces a large number of active sites. Strong interactions between the interfaces of the heterostructure lead to lower charge transfer resistance and enhance the intrinsic activity of active sites. As expected, Ag2S/NiSx demonstrated excellent OER catalytic performance in alkaline environments, with OER current densities of 10, 50, and 100 mA cm−2 obtained in 1 M KOH at overpotentials of only 42, 137, and 180 mV. When used in a two-electrode electrolyzer, Ag2S/NiSx can achieve 100 mA cm−2 at a low voltage of 1.81 V. This work provides an efficient way to enhance the overall catalytic performance of non-precious metal electrocatalysts.

Graphical abstract: An Ag2S-engineered heterojunction enhances the overall water splitting efficiency of NiSx catalysts

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Article information

Article type
Paper
Submitted
24 Jun 2025
Accepted
27 Jul 2025
First published
28 Jul 2025

J. Mater. Chem. C, 2025, Advance Article

An Ag2S-engineered heterojunction enhances the overall water splitting efficiency of NiSx catalysts

S. Li, L. Zhou, X. Shen, Y. Gu, Y. Tang and M. Wang, J. Mater. Chem. C, 2025, Advance Article , DOI: 10.1039/D5TC02429C

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