The transition metal dichalcogenide MoS₂ shows good catalytic properties for the hydrogen evolution reaction (HER). However, the HER activity of 2D MoS₂ is limited by its poor electrical conductivity. Bi₂Se₃ nanosheets are topological insulators possessing metallic surface states, thereby displaying unconventional electron dynamics and excellent conductivity. Therefore, combining Bi₂Se₃ nanosheets and with MoS₂ nanosheets represents a rational approach for improving the HER activity of MoS₂. In this work, Bi₂Se₃ nanoflowers were first synthesized via a hot injection method, followed by the slow growth of MoS₂ nanosheets on their surface to form heterostructured MoS₂@Bi₂Se₃ nanoflowers. Compared to pristine Bi₂Se₃ and MoS₂, the MoS₂@Bi₂Se₃ nanoflowers exhibited outstanding HER activity in acidic media with an onset overpotential of 134 mV, an overpotential of 208 mV at 10 mA/cm², a Tafel slope of 57 mV/dec and remarkable stability. The enhanced HER catalytic activity offered by the MoS₂@Bi₂Se₃ nanoflowers is attributed excellent electron transfer from Bi₂Se₃ to MoS₂, as well as the abundance of edge-rich MoS₂ nanosheets vertically aligned on the Bi₂Se₃ support that act as H₂ evolution sites.

过渡金属_二卤化钼MoS ₂对析氢反应（HER）表现出良好的催化性能。但是，2D MoS ₂的HER活性受到其不良电导率的限制。Bi ₂ Se ₃纳米片是具有金属表面态的拓扑绝缘体，因此显示出非常规的电子动力学和出色的导电性。因此，将Bi ₂ Se ₃纳米片与MoS ₂纳米片组合在一起代表了一种改善MoS ₂ HER活性的合理方法。在这项工作中，Bi ₂ Se ₃纳米花首先通过热注射法合成，然后在其表面上缓慢生长MoS ₂纳米片，以形成异质结构的MoS ₂ @Bi ₂ Se ₃纳米花。与原始Bi ₂ Se ₃和MoS _2相比，MoS ₂ @Bi ₂ Se ₃纳米花在酸性介质中表现出出色的HER活性，起始过电势为134 mV，在10 mA / cm ^2下的过电势为208 mV ，Tafel斜率57 mV / dec的电压和出色的稳定性。MoS ₂ @Bi ₂ Se ₃提供的增强的HER催化活性纳米花被归因于从Bi ₂ Se ₃到MoS _2的出色电子转移，以及在Bi ₂ Se ₃载体上垂直排列的富边缘MoS ₂纳米片的丰富性，这些载体充当H _2的进化位点。