(1. 湘潭大學(xué) 機(jī)械工程學(xué)院，湘潭 411105；
2. 湘潭大學(xué) 焊接機(jī)器人及應(yīng)用技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，湘潭 411105；
3. 湘潭大學(xué) 復(fù)雜軌跡加工工藝及裝備教育部工程研究中心，湘潭 411105)
摘 要: 采用粉末冶金方法燒結(jié)制備了多孔Ni-Cu-Ti-La2O3復(fù)合電極，討論不同La2O3的摻雜量對電極析氫性能的影響。利用X射線衍射(XRD)、掃描電鏡(SEM)、能譜儀(EDS)等測試手段對電極的微觀結(jié)構(gòu)和物相組成進(jìn)行表征。結(jié)果表明：Ni-Cu-Ti合金體系中La2O3的摻雜可有效提高電極材料的電荷傳輸速率，多孔Ni-Cu-Ti-La2O3復(fù)合電極在6 mol/L KOH溶液中表現(xiàn)出良好的析氫催化活性，其整體析氫催化活性明顯優(yōu)于多孔Ni-Cu-Ti、Ni-Cu-W、Ni-Cu-Co、Ni-Cu-Zr和Ni-Cu電極；當(dāng)燒結(jié)溫度為1000 ℃時，成分為Ni-Cu-Ti-9La的多孔復(fù)合電極具有最佳的析氫催化性能，其Tafel斜率為63.18 mV/dec，電流密度在10 mA/cm2時過電位為1077 mV(vs Hg/HgO)，多孔Ni-Cu-Ti-La2O3復(fù)合電極催化活性的提高得益于d軌道左半金屬元素La和右半金屬元素Ni、Cu之間的協(xié)同作用和其真實(shí)表面積的增大。
關(guān)鍵字: Ni-Cu-Ti-La2O3電極；多孔材料；粉末冶金；析氫性能
（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
