Recently, transition metal dichalcogenides (TMDs), represented by MoS 2 , have been proven to be a fascinating new class of electrocatalysts in hydrogen evolution reaction (HER). The rich chemical activities, combined with several strategies to regulate its morphologies and electronic properties, make MoS 2 very attractive for understanding the fundamentals of electrocatalysis. In this review, recent developments in using MoS 2 as electrocatalysts for the HER with high activity are presented. The effects of edges on HER activities of MoS 2 are briefly discussed. Then we demonstrate strategies to further enhance the catalytic performance of MoS 2 by improving its conductivity or engineering its structure. Finally, the key challenges to the industrial application of MoS 2 in electrocatalytic hydrogen evolution are also pointed out.
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