Strategies to enhance the electrocatalytic behavior of metal selenides for hydrogen evolution reaction: A review

Hydrogen energy has a significant and incredible impact on emerging technologies. However, the eco-friendly and clean production of hydrogen energy is under examination and challenging. Water splitting has been considered a sparkling and substantial resource for hydrogen energy, which is strongly dependent on the efficiency of the electrocatalysts. Owing to low cost, rich surface chemistry, greater electrocatalytic active sites, electrical conductivity and weak Se–H strength, metal selenides have originated the efficient electrocatalysts among the chalcogenides family. Several strategies have been adopted to enhance their electrocatalytic characteristics for hydrogen evolution reactions, either in the form of single or multi-metals selenides or post-transition elements doped metal selenides. Herein, fundamentals, synthesis methodologies, and the detailed electrocatalytic activities of the metal selenides have been comprehensively presented. The existing drawbacks and market values have also been concisely summarized for fresh readers and researchers to describe metal selenide electrocatalysts for hydrogen evolution reaction.