摘要
以碳毡为基体,采用瓦特型镀镍工艺电沉积镍,获得碳镍(C-Ni)电极,然后在离子液体体系中以C-Ni为基体电沉积Ni-Mo合金。采用扫描电镜和X射线衍射仪对合金电极的表面形貌和结构进行了表征,通过阴极极化曲线、交流阻抗等电化学测试研究了其析氢催化性能。实验结果表明,制得的Ni-Mo合金中Mo的质量百分含量约为5.12%,平均晶粒尺寸约为2.2 nm,为纳米晶结构;极化曲线测试表明,当电流密度为0.1 A·cm^(-2)时,Ni-Mo/C-Ni合金电极催化析氢电位较C-Ni电极正移108 m V,较碳毡正移557 m V,较水溶液中沉积的紫铜基Ni-Mo合金电极正移约50 m V;连续电解和断电流实验结果表明Ni-Mo/C-Ni合金电极具有良好的电化学稳定性,实用前景广阔。
Based on carbon felt,C-Ni electrode was electrodeposited with Watt nickel plating process;then the Ni-Mo alloy electrode was obtained based on C-Ni electrode that has been prepared in ionic liquids system. Its surface morphology and structure were performed with scanning electric microscope and X-ray diffractometer,respectively; and its property of electrochemical catalyzed hydrogen evolution has been studied by means of cathodic polarization curves and A. C. impedance technique. Experimental results suggest that the prepared C-Ni/Ni-Mo alloy contains about 5. 12% Mo and has a nanocrystalline structure with average crystallites sizes of 2. 2 nm; and polarization curves indicate that the catalytic hydrogen evolution potential of Ni-Mo/C-Ni alloy electrode deposited in ionic liquid has a positively shift of about 108 mV compared with C-Ni electrode and about 557 mV compared with C felt electrode and about50 mV compared with Ni-Mo based on Cu substrate in aqueous solution under the current density of 0. 1A·cm2; the potential fluctuation of Ni-Mo/C-Ni alloy electrode is slight during a prolonged electrolysis,and the potential is able to recover rapidly after short current interruption. So Ni-Mo/ C-Ni alloy electrode shows a good electrochemical stability.
作者
王宏智
张晓振
黄波
张卫国
姜世圣
姚素薇
Wang Hongzhi Zhang Xiaozhen Huang Bo Zhang Weiguo Jiang Shisheng Yao Suwei(Shanshan Research Office of Surface Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, Chin)
出处
《化学工业与工程》
CAS
CSCD
2017年第1期53-59,共7页
Chemical Industry and Engineering
关键词
碳毡
离子液体
电沉积
Ni-Mo合金
催化析氢
carbon felt
ionic liquids
electrodeposition
Ni-Mo alloy
catalytic hydrogen evolution
