Nano-Micro Letters, Volume. 16, Issue 1, 063(2024)
Precisely Control Relationship between Sulfur Vacancy and H Absorption for Boosting Hydrogen Evolution Reaction
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 (VS) of NiS2 to further enhance the electrocatalytic performance for hydrogen evolution reaction (HER). With the VS concentration change from 2.4% to 8.5%, the H* adsorption strength on S sites changed and NiS2-VS 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 NiS2-VS 5.9% appears at a very low voltage, which is favorable for the HER in alkaline media. Density functional theory calculations also demonstrate the NiS2-VS 5.9% has the optimal |ΔGH*| of 0.17 eV. This work offers a simple and promising pathway to enhance catalytic activity via precise vacancies strategy.
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Jing Jin, Xinyao Wang, Yang Hu, Zhuang Zhang, Hongbo Liu, Jie Yin, Pinxian Xi. Precisely Control Relationship between Sulfur Vacancy and H Absorption for Boosting Hydrogen Evolution Reaction[J]. Nano-Micro Letters, 2024, 16(1): 063
Category: Research Articles
Received: Jul. 7, 2023
Accepted: Nov. 21, 2023
Published Online: Jan. 23, 2025
The Author Email: Yin Jie (yinj@lzu.edu.cn), Xi Pinxian (xipx@lzu.edu.cn)