(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)
摘 要: 采用粉末冶金方法烧结制备了多孔Ni-Cu-Ti-La2O3复合电极，讨论不同La2O3的掺杂量对电极析氢性能的影响。利用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)等测试手段对电极的微观结构和物相组成进行表征。结果表明：Ni-Cu-Ti合金体系中La2O3的掺杂可有效提高电极材料的电荷传输速率，多孔Ni-Cu-Ti-La2O3复合电极在6 mol/L KOH溶液中表现出良好的析氢催化活性，其整体析氢催化活性明显优于多孔Ni-Cu-Ti、Ni-Cu-W、Ni-Cu-Co、Ni-Cu-Zr和Ni-Cu电极；当烧结温度为1000 ℃时，成分为Ni-Cu-Ti-9La的多孔复合电极具有最佳的析氢催化性能，其Tafel斜率为63.18 mV/dec，电流密度在10 mA/cm2时过电位为1077 mV(vs Hg/HgO)，多孔Ni-Cu-Ti-La2O3复合电极催化活性的提高得益于d轨道左半金属元素La和右半金属元素Ni、Cu之间的协同作用和其真实表面积的增大。
关键字: Ni-Cu-Ti-La2O3电极；多孔材料；粉末冶金；析氢性能
（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 Trajectory Processing Technology and Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105, China）
Abstract:The porous Ni-Cu-Ti-La2O3 composite electrodes were prepared by powder metallurgy sintering. The effects of different doping amounts of La2O3 on the hydrogen evolution performance of the electrodes were discussed. The phase composition and microstructure of the electrodes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The results show that the doping of La2O3 in the Ni-Cu-Ti alloy can effectively improve the charge transfer rate of the electrode material. The porous Ni-Cu-Ti-La2O3 composite electrode has a good catalytic activity for hydrogen evolution reaction in 6 mol/L KOH solution, and its overall catalytic activity for hydrogen evolution is better than that of porous Ni-Cu-Ti, Ni-Cu-W, Ni-Cu-Co, Ni-Cu-Zr, and Ni-Cu electrodes. When the sintering temperature is 1000 ℃, the porous composite electrode with the composition of Ni-Cu-Ti-9La has the best catalytic performance for hydrogen evolution reaction. The Tafel slope is 63.18 mV/dec and the overpotential is 1077 mV (vs Hg/HgO) at the current density of 10 mA/cm2. The improvement of catalytic activity of the porous Ni-Cu-Ti-La2O3 composite electrode is attributed to the synergistic effect between the left semimetal element La and the right semimetal element Ni and Cu of the d-orbital, as well as the increase of its real surface area.
Key words: Ni-Cu-Ti-La2O3 electrode; porous materials; powder metallurgy; hydrogen evolution performance
