纳米多孔Ni、Ni3S2/Ni复合电极的制备及其电催化析氢性能

采用脱合金化和水热合成的方法制备纳米多孔Ni和纳米多孔Ni₃S₂/Ni复合电极。通过N₂吸附-脱附测试、XRD、SEM、TEM等方法表征电极的孔径分布、物相和微观结构。在1 mol·L^-1的NaOH溶液中，运用线性扫描伏安（LSV）曲线、交流阻抗（EIS）谱图、恒电流电解法等测试电极的电催化析氢性能。结果表明：在电流密度为50 mA·cm^-2时，与纳米多孔Ni相比，Ni₃S₂/Ni合金具有更低的析氢过电位以及更高的析氢活性，同时纳米多孔Ni₃S₂/Ni复合电极具有更低表观活化能和电子转移阻抗，进一步明确了过渡金属硫化物对电催化析氢性能的特殊贡献。

Nano-Porous Ni and Ni3S2/Ni Composite Electrodes: Preparation and Electrocatalytic Hydrogen Evolution Performance

Nano-porous Ni and nano-porous Ni₃S₂/Ni composite electrodes were prepared by dealloying and hydrothermal synthesis. The pore size distribution, phase and microstructure of the electrode were characterized by N₂ adsorption-desorption test, XRD, SEM, TEM. In 1 mol·L^-1 NaOH solution, the electrocatalytic properties toward hydrogen evolution reaction of the electrode was evaluated using linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and constant current electrolysis method. As a result, when the current density was 50 mA·cm^-2, the nano-porous Ni₃S₂/Ni composite electrode had a lower overpotential for hydrogen evolution reaction and higher electrocatalytic hydrogen evolution activity than the nano-porous Ni, while nano-porous Ni₃S₂/Ni composite electrode had lower apparent activation energy and electron transfer resistance, it further clarifies the special contribution of transition metal sulfides to the performance of electrocatalytic hydrogen evolution.