Constructing Heteroatom-Doped Transition-Metal Sulfide Heterostructures for Hydrogen Evolution Reaction

Transition-metal sulfide (TMS) has been regarded as themost promisingalternative to construct non-noble metal catalysts in the electrochemicalhydrogen evolution reaction (HER). The excellent edge activation ofMoS(2) and abundant catalytic active sites of Ce2S3 can be utilized as the premise of constructing heterogeneousmaterials for electrochemical applications. Afterward, the heteroatoms(C, N, O, and Na) have been introduced to increase the original numberof active sites (the number of the S-Mo-S on the edgemolecular layer of MoS2 and exposed metal active centerof Ce2S3). Additionally, the heterostructureof HAs@MoS2/Ce2S3 and ordered/amorphouscarbon can enhance the activity by creating defects and localizeddisorder fields and accelerating the charge separation/transfer fromcerium (Ce) sites to molybdenum (Mo) sites. Combining the above advantages,HAs@MoS2/Ce2S3 shows promising propertiestoward HER not only in acidic environments with a low overpotential(147.0 mV) but also in alkaline (160.5 mV) environments.