熔盐电解法制备纳米花状2H Co /MoS_2及其析氢性能研究

Petal-shaped Co/MoS₂ with different doping amounts was prepared by electrolyzing the LiCl - KCl - KSCN - Na₂MoO₄ - CoCl₂ molten salt system at a constant current. Co/MoS₂ was characterized by means such as XRD, SEM, HRTEM and XPS. The results showed that Co was successfully and uniformly doped into the MoS₂ crystal structure. The results of the hydrogen evolution performance test showed that when the doping amount of Co was 14%, the catalytic performance was the best. When the current density was 10 mA/cm², the overpotential of Co/MoS₂ - 2 was 229.2 mV, the Tafel slope was 0.195, the double-layer capacitance was 19.6 mF/cm², and it had the smallest charge transfer equivalent resistance (RCT) of 3.6 Ω. The Co/MoS₂ catalyst prepared by the molten salt electrolysis method achieved a simultaneous improvement in the catalytic activity and stability of hydrogen evolution (HER) in an alkaline environment, providing a new method and new ideas for the preparation of catalysts.

通过恒电流电解LiCl-KCl-KSCN-Na_2MoO_4-CoCl_2熔盐体系,制备出不同掺杂量花瓣状的Co /MoS_2。利用XRD、 SEM、HRTEM和XPS等手段对Co /MoS_2进行表征,结果表明Co成功并均匀地掺杂入MoS_2晶体结构中。析氢性能测试结果表明,Co的掺杂量为14%时催化性能最好,在电流密度为10 mA/cm~2时,Co /MoS_2-2的过电位为229.2 mV,塔菲尔斜率为0.195,双层电容大小为19.6 mF /cm~2,同时拥有最小的电荷传输等效电阻(R_(CT))3.6 Ω。熔盐电解法制备的Co /MoS_2催化剂实现了碱性环境中析氢(HER)催化活性及稳定性的同步提升,为催化剂的制备提供了新方法和新思路。