Two-dimensional transition-metal dichalcogenides for electrochemical hydrogen evolution reaction

In this review, we comprehensively review some recent progress of two-dimensional (2D) transition-metal di-chalcogenides (TMDs) in the application of hydrogen evolution reaction (HER), for the purpose of offering a reference for related researchers, especially for new beginners in this research field. The mechanism of HER is first presented in detail, followed by an introduction of evaluation methods and some considerations in HER tests. Then, we make a brief description of composition, structure and crystal phases of TMDs. Next, we highlight the intrinsic factors determining HER performance and summarize the recent development of strategies for improving the HER performance of TMDs. At last, an overall summary is presented and important challenges are discussed as well.