非晶态Ni-S-Mn三元合金电极析氢行为

Electrocatalytic Behavior of Ni-S-Mn Alloy Electrode for Hydrogen Evolution Reaction

采用电沉积法在镍网上制备了电解水用非晶态N i-S-Mn合金电极,用电极的阴极极化曲线和电极的析氢反应动力学参数评价了电极的析氢电化学活性。实验结果表明,该合金电极对氢的析出反应具有较高电催化活性,在200 mA电流时析氢过电位分别比N i电极和N i-S电极降低了180和80 mV。采用小三角波电位扫描、扫描电镜、能谱分析、X射线衍射等测试技术,考察了N i-S-Mn合金电极表面粗糙度、表面形貌、镀层的组成及电极合金的结构等因素,并对Mn元素的作用进行了解释。

The alloy electrode of amorphous Ni-S-Mn electrodeposited on the surface of nickel net and used in water electrolysis was prepared and studied. The electrocatalytic activity of Ni-S-Mn electrode for hydrogen evolution reaction was evaluated by means of cathodic polarization curves and related electrochemical parameters. The results show that the overpotential of hydrogen evolution reaction is 180 mV and 80 mV less than Ni and Ni-S electrodes, respectively. This illustrates that the electrocatalytic activity of so-prepared Ni-S-Mn electrode is better than those of Ni and Ni-S electrodes. The potential scan with a small-amplitude triangular wave, SEM, TEM and XRD methods were applied to the analyses of the roughness, morphology and microstructure of the electrode surface. Finally, the role of element Mn was discussed in detail.