Atomically Thin Transition‐Metal Dichalcogenides for Electrocatalysis and Energy Storage

Since the discovery of graphene in 2004, research on 2D materials has grown rapidly. Compared to their bulk counterparts, 2D atomically thin, layered transition‐metal dichalcogenides (TMDCs or MX 2 ) nanosheets exhibit excellent electronic and optical properties, outstanding mechanical flexibility, and exceptional catalytic performance. As a representative of 2D materials, MX 2 holds great promise in many potential applications, especially in energy‐related applications. Here, a brief overview of atomically thin layered MX 2 nanosheets applied in energy storage and conversion systems is presented. Firstly, the crystal structures and phases, morphologies, and synthesis methods of MX 2 are discussed. Sequentially, the achieved progress on atomically thin MX 2 in energy‐related applications (i.e., the hydrogen‐evolution reaction, oxygen‐evolution reaction, CO 2 electrochemical reduction, electrochemical capacitors, lithium‐ion batteries, sodium‐ion batteries, and lithium–sulfur batteries) is systematically discussed. Finally, the conclusions and some prospects regarding atomically thin MX 2 for applications in the field of energy‐storage systems are provided.