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制备超小型层状金属硫属化合物是一种有效增加边缘活性位点和高效提升析氢性能的方法.本文首次报道了一种原位撕裂的方法来制备由碳纳米管(CNTs)支撑的三元MoSeS纳米复合析氢催化剂.生长在CNTs@Ni(OH)_2薄膜上的大尺寸多层MoS_2片(18.3±1.1nm),通过原位的硒化过程被撕裂成超小的MoSeS(5.2±0.7 nm)纳米片,同时Ni(OH)_2薄膜也被转化为小尺寸的NiSe纳米晶,最终得到的纳米复合催化剂具有丰富的边缘活性位点,表现出超高的活性,在200mA cm~(-2)高的电流密度下,过电势只要189mV;同时在10000次循环下,依旧保持优异的稳定性.该工作为纳米晶催化剂的设计和应用打下了良好的基础.
Preparation of ultra-small layered metal chalcogenide is an effective way to increase the edge active sites and efficiently enhance the performance of hydrogen evolution.In this paper, for the first time reported a method of in situ tearing to prepare carbon nanotubes (CNTs) supported by the three Elemental MoSeS nanocomposite hydrogen evolution catalyst. Large-scale multi-layered MoS 2 flakes (18.3 ± 1.1 nm) grown on CNTs @ Ni (OH) 2 thin films were torn into ultra-small MoSeS by in-situ selenization process (5.2 ± 0.7 nm) nanosheets. Meanwhile, Ni (OH) _2 thin films have also been transformed into NiSe nanocrystals with small size. The resulting nanocomposite catalyst has abundant active sites at the edge and exhibits extremely high activity at 200 mA cm ~ ( -2) high current density, the overpotential is only 189mV, while still maintaining the excellent stability under 10,000 cycles.The work laid a good foundation for the design and application of nanocrystalline catalysts.