Ni_(3)S_(2)/偕胺肟化聚丙烯腈复合材料的制备及其析氢性能研究

Preparation of Ni_(3)S_(2)/Amidoximated Polyacrylonitrile Composites and Its Hydrogen Evolution Properties

催化活性和循环稳定性是提升Ni_(3)S_(2)电催化剂析氢反应(HER)性能的关键因素。本文以氯化镍、硫脲、L-半胱氨酸和偕胺肟化聚丙烯腈高分子(AOCF)为原料,通过溶剂热法和配位负载法成功制备Ni_(3)S_(2)/偕胺肟化聚丙烯腈高分子(Ni_(3)S_(2)/AOCF)复合材料。结构和性能表征说明:Ni_(3)S_(2)通过Ni与AOCF链上的—OH和—NH_(2)之间形成配位键,从而形成Ni_(3)S_(2)/AOCF复合材料。Ni_(3)S_(2)/AOCF复合材料在酸性介质中作为HER电催化剂表现出了良好的电催化性能和良好的长期耐久性,当电流密度为-30 mV/cm^(2)时,过电势为-233 mV,Tafel斜率为94.7 mV/dec,循环稳定性维持50 h以上。因此,Ni_(3)S_(2)/AOCF复合材料展现了较高析氢性能、低成本和稳定性良好等特性。

Catalytic activity and cycle stability are the critical factors in improving the performance of the hydrogen evolution reaction(HER)of Ni_(3)S_(2)electrocatalyst.In this study,Ni_(3)S_(2)/amine oxime polyacrylonitrile polymer(AOCF)composites were successfully prepared from nickel chloride,thiourea,L-cysteine,and AOCF by solvothermal and ligand loading methods.The results of structure and performance characterization show that Ni_(3)S_(2)forms a coordination bond between Ni and—OH and—NH_(2) on the AOCF chain,resulting in Ni_(3)S_(2)/AOCF composites.As HER electrocatalysts in acidic media,Ni_(3)S_(2)/AOCF composites exhibit excellent electrocatalytic activity and good cycle stability,with an overpotential of-233 mV,a Tafel slope of 94.7 mV/dec,and cycling stability of up to 50 h at a current density of-30 mV/cm^(2).As a result,Ni_(3)S_(2)/AOCF composites show the characteristics of high hydrogen evolution performance,low cost,and good stability.