一步水热法合成MoS_2/Ni Foam复合材料及电催化析氢性能研究

Synthesis of MoS_2/Ni Foam Composites by One-Step Hydrothermal Method and Electrocatalytic Activity for Hydrogen Evolution

以原料丰富、成本低并且催化性能优异的析氢(HER)催化剂代替贵金属Pt基催化剂,并应用于电催化分解水具有重要意义.以仲钼酸铵((NH_4)_6Mo_7O_24·4H_2O)、硫脲(H_2NCSNH_2)、泡沫镍(Ni Foam)以及盐酸羟胺(NH_2OH·HCl)为原料,采用水热法制备了纳米花状MoS_2材料,并通过一步水热法在泡沫镍基底上垂直生长了层状及类花状结构的二硫化钼(MoS_2),合成了MoS_2/Ni Foam复合材料,利用X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等表征手段对样品的物相和形貌进行了详细的表征分析.在1M KOH中对MoS_2/Ni Foam复合材料进行电催化析氢性能研究,结果显示:Ni Foam,MoS_2之间的协同催化作用、电耦合以及暴露于表面的丰富的边缘活性位点使得MoS_2/Ni Foam复合材料展现出优异的电催化析氢性能,并明显优于单相MoS_2纳米材料,在电流密度10 mA·cm^(-2)下析氢过电位仅为118 mV,经过200 h连续电解仍能保持优异的电催化析氢性能.

It is of great significance to use a hydrogen evolution(HER)catalyst with abundant raw materials,low cost and excellent catalytic performance instead of noble metal Pt-based catalyst for electrocatalytic decomposition of water.Ammonium paramolybdate((NH4)6Mo7O24·4H2O),thiourea(H2NCSNH2),Ni Foam and hydroxylamine hydrochloride(NH2OH·HCl)were used as raw materials to prepare nano-flower-like MoS2 materials by hydrothermal method,and layered and flanked vertically on foamed nickel substrate by one-step hydrothermal method.MoS2/Ni Foam composites were synthesized by flower-like molybdenum disulfide(MoS2).The phase and shape of the samples were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The detailed characterization analysis was carried out.The electrocatalytic hydrogen evolution performance of MoS2/Ni Foam composites in 1M KOH showed that synergistic catalysis between Ni Foam and MoS2,electrical coupling and rich edges exposed to the surface.The active site makes the MoS2/Ni Foam composite exhibit excellent electrocatalytic hydrogen evolution performance and is superior to single-phase MoS2 nanomaterials.The hydrogen evolution overpotential is only 118 mV at a current density of 10 mA·cm^-2,after 200 hours of continuous electricity.The solution still maintains excellent electrocatalytic hydrogen evolution performance.