(1. 湘潭大学 机械工程学院，湘潭 411105； 2. 湘潭大学 焊接机器人及应用技术湖南省重点实验室，湘潭 411105； 3. 湘潭大学 复杂轨迹加工工艺及装备教育部工程研究中心，湘潭 411105; 4. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用元素粉末反应合成法制备多孔Ni3Al-Mo电极。采用扫描电镜(SEM)和X射线衍射(XRD)对多孔Ni3Al-Mo电极的孔结构进行表征，通过极化曲线和电化学阻抗技术表征多孔Ni3Al-Mo电极的电解析氢行为。结果表明：多孔Ni3Al-Mo电极孔隙率为47%，最大孔隙为2.7 μm，平均孔隙约2.1 μm。与多孔Ni3Al电极和多孔Ni电极相比，多孔Ni3Al-Mo电极具有较低的析氢过电位和较高的交换电流密度，表明多孔Ni3Al-Mo电极具有较高的析氢活性；经过阳极处理后，多孔Ni3Al-Mo电极的析氢活性可以恢复到原来的大小，且连续电解120 h后，析氢过电位变化不大，表明多孔Ni3Al-Mo电极具有优异的电化学稳定性。
关键字: 反应合成法；多孔Ni3Al-Mo电极；极化曲线；阻抗谱；稳定性
（1. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2. Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China; 3. Engineering Research Center of Complex Tracks Processing Technology and Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105, China; 4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Objective of this work was to investigate the electrochemical performance of porous Ni3Al-Mo electrodes for hydrogen evolution reaction using cathodic polarization and impedance spectroscopy techniques. The morphology of the porous Ni3Al-Mo electrode was characterized by scanning electron mircosope(SEM) and X ray diffration(XRD). The results show that Ni3Al-Mo electrode has a large porosity of 47%, the maximum pore size of 2.7 μm, the mean pore size of 2.1 μm and lower overpotential, higher exchange current density comparing to the porous Ni3Al and porous Ni electrodes. After anodic treatment, the polarization curve becomes almost the same as the one recorded before the anodic treatment. The activity of the porous Ni3Al-Mo electrode does not change much after the current interruptions, even after 120 h, which indicates that porous Ni3Al-Mo electrode has higher hydrogen evolution activity and better electrocatalytic performance.
Key words: hydrogen evolution reaction; porous Ni3Al-Mo electrodes; cathodic polarization; impedance spectroscopy; stability
