![]() Therefore, designing effective, inexpensive and stable non-noble metal catalysts for HER will be the focus of future research. To date, Pt-based compounds are the most effective catalysts for HER, but their large-scale application is limited by high price, scarcity and poor stability. Crucial to addressing this challenge need to find high catalytic activity and good stability catalysts for HER. In general, the appropriate H 2O adsorption and dissociation energy is certainly one deciding factor for this process. However, there are still challenges in alkaline media, and it is difficult to generate H* through the HER. In addition, industry tends to produce hydrogen in alkaline media due to their low cost, easy to manufacture and good performance. And electrochemical hydrogen evolution reaction (HER) is now considered one of the most effective and clean method to produce H 2, as a promising candidate for sustainable development. Hydrogen energy usually be regarded as the most promising clean energy source for development at present. This work offers a simple and promising pathway to enhance catalytic activity via precise vacancies strategy. ![]() Density functional theory calculations also demonstrate the NiS 2-V S 5.9% has the optimal |ΔG H*| of 0.17 eV. The S- H* peak of the NiS 2-V S 5.9% appears at a very low voltage, which is favorable for the HER in alkaline media. In situ attenuated-total-reflection Fourier transform infrared spectroscopy (ATR-FTIRS) measurements are usually used to monitor the adsorption of intermediates. With the V S concentration change from 2.4% to 8.5%, the H* adsorption strength on S sites changed and NiS 2-V S 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. Here, we report an anionic etching method to tailor the sulfur vacancy (V S) of NiS 2 to further enhance the electrocatalytic performance for hydrogen evolution reaction (HER). Effective and robust catalyst is the core of water splitting to produce hydrogen.
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