兰州理工大学学报

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (3): 7-12.

• 材料科学与工程 • 上一篇    下一篇

纳米多孔Ni的制备及其电催化析氢性能研究

周琦1,2, 段德东2, 郑诚2   

  1. 1.兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 甘肃 兰州 730050;
    2.兰州理工大学 材料科学与工程学院, 甘肃 兰州 730050
  • 收稿日期:2019-07-09 出版日期:2020-06-28 发布日期:2020-08-19
  • 作者简介:周 琦(1963-),女,湖南长沙人,教授.
  • 基金资助:
    国家自然科学基金(51661018)

Preparation of nanoporous Ni and its electrocatalytic activity for hydrogen evolution

ZHOU Qi1,2, DUAN De-dong2, ZHENG Cheng2   

  1. 1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech, Lanzhou 730050, China;
    2. College of Materials Science and Engineering, Lanzhou Univ. of Tech, Lanzhou 730050, China
  • Received:2019-07-09 Online:2020-06-28 Published:2020-08-19

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摘要： 采用快速凝固结合脱合金的方法制备纳米多孔Ni,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)对试样进行物相分析和形貌表征,并使用线性扫描伏安(LSV)、循环伏安(CV)、交流阻抗(EIS)等方法测试纳米多孔Ni电极的电催化析氢性能.结果表明:Ni5Al95前驱体合金在65 ℃条件下经4 h脱合金化后获得多层次、双连续的纳米多孔Ni.在50 mA·cm－2电流密度下,25 ℃时析氢过电位为257 mV,双电层电容为4.7 mF·cm－2,在析氢反应过程中表观活化能为26.06 kJ·mol－1,电化学脱附是整个反应的控制步骤.经过1 000圈循环伏安耐久实验后,纳米多孔Ni电极在25 ℃下极化曲线基本保持原状,50 mA·cm－2电流密度下析氢过电位减小6 mV,表现出优良的析氢稳定性.

关键词: 快速凝固, 脱合金化, 纳米多孔Ni, 析氢性能

Abstract: Nanoporous Ni was prepared by rapid solidification and de-alloying. SEM and XRD were used for phase analysis and morphology characterization in our study. The electrocatalytic hydrogen evolution performance of nanoporous Ni electrode was meanwhile tested by means of linear sweep voltammetry (LSV), cyclic voltammetry (CV), and alternating current impedance (EIS). The results show that the Ni5Al95 precursor alloy can be de-alloyed at 65 ℃ for 4 h, obtaining multi-layered, bi-continuous nanoporous Ni. At a current density of 50 mA·cm－2, the hydrogen evolution over-potential at 25 ℃ is 257 mV, the electric double layer capacitance is 4.7 mF·cm－2, and the apparent activation energy during the hydrogen evolution reaction is 26.06 kJ·mol－1. Electrochemical desorption becomes the control step for the whole reaction process. After 1 000 cycles of cyclic voltammetric endurance test, the polarization behaviors of nanoporous Ni electrode at 25 ℃ remains its original state. The hydrogen evolution over-potential decreased by 6 mV in the case of current density of 50 mA·cm－2, which demonstrates excellent hydrogen evolution stability.

Key words: rapid solidification, de-alloying, nanoporous Ni, hydrogen evolution performance

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