Pt/MoC的制备及其在电解水析氢反应中的性能

Preparation of Pt / MoC and its performance in Electrolysis Hydrogen Evolution

摘要:

以钼酸铵和氯铂酸为原料，通过原位程序升温碳化过程，合成制备了负载量不同的Pt/MoC催化剂并考察了其在电解水析氢反应（HER）中的催化性能。用XRD、BET、SEM、TEM、XPS对催化剂的微观结构及物理化学性质进行了表征。结果表明，Pt的负载改变了碳化过程碳化钼形成的拓扑结构，Pt负载后的样品更容易形成α-Mo2C相。Pt的负载量对碳化钼催化剂在HER反应中具有显著的影响，1.6Pt/MoC催化剂表现出最优催化效果（过电势ηonset= 108 mV，塔菲尔斜率b = 74 mV/dec）及较低的阻抗（18.77 Ω），可以与商业Pt/C催化剂相媲美。

Abstract:

Using ammonium molybdate and chloroplatinic acid as raw materials, through the in-situ temperature-programmed carbonization process, Pt/MoC catalysts with different loading amounts were synthesized and their catalytic performances in the hydrogen evolution reaction (HER) of electrolyzed water were investigated. The microstructure and physicochemical properties of the catalysts were characterized by XRD, BET, SEM, TEM and XPS. The results show that the Pt loading changes the topological structure of molybdenum carbide during the carbonization process, and the Pt-loaded sample more easily forms the α-Mo2C phase. The loading of Pt has a significant effect on the molybdenum carbide catalyst in the HER reaction. The 1.6 Pt/MoC catalyst exhibits an optimal catalytic effect (overpotential ηonset = 108 mV, Tafel slope b = 74 mV∙dec-1) and The lower impedance (18.77 Ω) is comparable to commercial Pt/C catalysts.