Precisely Control Relationship Between Sulfur Vacancy and H Absorption for Boosting Hydrogen Evolution Reaction

Overview

Journal Nanomicro Lett

Publisher Springer

Date 2024 Jan 3

PMID 38168843

Authors

Jing Jin

Xinyao Wang

Yang Hu

Zhuang Zhang

Hongbo Liu

Jie Yin

Pinxian Xi

Affiliations

Soon will be listed here.

Abstract

Effective and robust catalyst is the core of water splitting to produce hydrogen. Here, we report an anionic etching method to tailor the sulfur vacancy (V) of NiS to further enhance the electrocatalytic performance for hydrogen evolution reaction (HER). With the V concentration change from 2.4% to 8.5%, the H* adsorption strength on S sites changed and NiS-V 5.9% shows the most optimized H* adsorption for HER with an ultralow onset potential (68 mV) and has long-term stability for 100 h in 1 M KOH media. In situ attenuated-total-reflection Fourier transform infrared spectroscopy (ATR-FTIRS) measurements are usually used to monitor the adsorption of intermediates. The S- H* peak of the NiS-V 5.9% appears at a very low voltage, which is favorable for the HER in alkaline media. Density functional theory calculations also demonstrate the NiS-V 5.9% has the optimal |ΔG| of 0.17 eV. This work offers a simple and promising pathway to enhance catalytic activity via precise vacancies strategy.

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