多孔Ni-S合金的制备及其电催化析氢性能

Preparation of nano-porous Ni-S-alloy electrodes and their electro-catalytic performance with respect to hydrogen evolution

采用化学脱合金化和水热合成的方法,制备多孔Ni以及多孔Ni-S合金电极.通过XRD、SEM表征电极的相结构和表面形貌.在1 mol/L的NaOH溶液中,运用线性扫描伏安曲线(LSV)、交流阻抗曲线(EIS)等测试电极的电催化析氢性能.结果表明:与多孔Ni相比,Ni-S合金具有更低的析氢过电位以及更高的电催化析氢活性.

Electrodes of porous monometallic Ni and porous Ni-S alloys were prepared by means of dealloying and hydro-thermal synthesis. Their metallo-graphical structure and surface morphology were characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). In 1 mol/L NaOH solution, the electro-catalytic performance in connection with hydrogen evolution (HE) of the electrodes was tested by using electrochemical linear voltammetric scanning (LSV) and electrochemical impedance spectroscopy (EIS). The result showed that the porous Ni-S electrode would exhibit a lower over-potential for HER and a higher electro-catalytic activity of HE than that of the porous Ni electrode.