Recent Strategies for NiS-Based Electrocatalysts with Enhanced Hydrogen Evolution Performance: A Tutorial Review.

Water electrolysis represents one of the most environmentally friendly methods for hydrogen production, while its overall efficiency is primarily governed by the electrocatalyst. Nickel sulfides, e.g., NiS, are considered to be highly promising catalysts for the hydrogen evolution reaction (HER) due to their distinctive chemical structure. However, the practical application of NiS-based electrocatalysts is hindered by unsatisfactory high overpotential in the HER and weakened catalytic performance under alkaline conditions. Therefore, in this regard, further research on NiS-based catalysts is being carried out to tackle these challenges. This review provides a comprehensive survey of the latest advancements in NiS-based in improving the HER performance of NiS-based electrocatalysts. The review may offer some inspiration for the rational design and synthesis of novel transition metal-based catalysts with enhanced water electrolysis performance.