多孔Ni-Cu-Ti电极的制备及析氢性能

Preparation and Hydrogen Evolution Performance of Porous Ni-Cu-Ti Electrode

通过电解水生产氢气是一种理想的方法,而电极材料的催化活性决定了电解水的效率。该研究通过粉末冶金方法制备了多孔Ni-Cu-Ti电极,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等技术对多孔Ni-Cu-Ti电极的微观结构和物相组成进行表征,并通过阴极极化、交流阻抗谱和循环伏安测试技术对电极进行了电化学表征。结果表明,在烧结温度为1000℃、质量比为5.5∶3.5∶1时,多孔Ni-Cu-Ti电极表现出最佳的析氢性能,在1 mol/L的KOH中仅需要79 mV(vs.RHE)的过电位就能实现10 mA·cm^(-2)的电流密度,其Tafel斜率为117.07 mV·dec-1。

Hydrogen production by electrolysis of water is an ideal method,and the catalytic activity of the electrode material determines the efficiency of water electrolysis.In this study,a porous Ni-Cu-Ti electrode was prepared by the powder metallurgy method.The microstructure and phase composition of the porous Ni-Cu-Ti electrodes were characterized by scanning electron microscope(SEM)and X-ray diffraction(XRD)techniques.Meanwhile,electrochemical characterization of the electrodes were measured by cathodic polarization,electrochemical impedance spectroscopy,and cyclic voltammetry.The results show that when the sintering temperature was 1000℃and the mass ratio was 5.5∶3.5∶1,the porous Ni-Cu-Ti electrode exhibited the best hydrogen evolution performance.It only requires an overpotential of 79 mV(vs.RHE)to achieve a current density of 10 mA·cm^(-2) in 1 mol/L KOH,and its Tafel slope is 117.07 mV·dec-1.