Mo-Ni_(3)S_(4)复合材料的合成及其析氢性能

Synthesis and hydrogen evolution properties of Mo-Ni_(3)S_(4)composites

为制备环境友好、可再生、低成本的高效过渡金属电催化电极材料,以泡沫镍为基底,通过先水热Mo修饰再气相S沉积的方法合成了Mo-Ni_(3)S_(4)复合材料,利用SEM、XRD、XPS等技术手段对其形貌和微结构进行表征。通过线性伏安曲线、塔菲尔曲线、双层电容和稳定性等电化学测试方法研究了电极材料的析氢性能。结果表明:不同温度下S掺杂可以调控硫化物在泡沫镍的生长情况;硫化温度为450℃时,泡沫镍上形成致密的线状体,有利于析氢过程中电解液的渗透和气泡的释放,促进电解水的解吸平衡,提高电解水过程中的产氢效率;在析氢反应过程中,当电流密度达到10 mA/cm^(2)时,Mo-Ni_(3)S_(4)表现的过电势为190mV。

This paper aims to prepare efficient transition metal electrocatalysis electrode materials which is friendly for environment,renewable and low-cost properties.The study involves using Ni foam substrate to synthesize Mo-Ni_(3)S_(4)composite materials with the methods of hydrothermal Mo modification and vapor phase S deposition;characterizing the morphology and microstructure of the composite materials by using SEM,XRD,XPS and other techniques;and investigating the hydrogen evolution properties of electrode materials by means of LSV curve,Tafel spectra,duble leyer capacitance and stability.The results show that S doping can regulate and control the growth of sulfide in nickel foam at different temperatures;when the vulcanization temperature is 450℃,the dense linear bodies are formed on the nickel foam,which is good for the infiltration of electrolyte and the release of bubbles in the process of hydrogen evolution,which is promoting the desorption balance of electrolytic water and improving the efficiency of hydrogen production in the process of electrolytic water;when current density reaches 10 mA/cm^(2),the overpotential of Mo-Ni_(3)S_(4)is 190 mV during the hydrogen evolution reaction.