高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (1): 162-174.doi: 10.7503/cjcu20190340

• 物理化学 • 上一篇    下一篇

纳米多孔Ni和NiO的制备及电催化析氧性能

任向荣,周琦()   

  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,兰州理工大学材料科学与工程学院, 兰州 730050
  • 收稿日期:2019-06-17 出版日期:2019-12-21 发布日期:2019-11-21
  • 通讯作者: 周琦 E-mail:zhouxq301@sina.com
  • 基金资助:
    国家自然科学基金资助批准号(51661018)

Preparation of Nanoporous Ni and NiO and Their Electrocatalytic Activities for Oxygen Evolution Reaction

REN Xiangrong,ZHOU Qi()   

  1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2019-06-17 Online:2019-12-21 Published:2019-11-21
  • Contact: Qi ZHOU E-mail:zhouxq301@sina.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China No(51661018)

摘要:

采用快速凝固与脱合金相结合的方法制备了纳米多孔Ni, 经热处理氧化获得纳米多孔NiO, 利用X射线衍射仪(XRD)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)和氮气吸附-脱附仪(BET)对纳米多孔Ni和NiO的物相、 形貌结构和孔径分布进行了表征, 并通过循环伏安、 稳态极化和电化学阻抗分析研究了电极的电催化析氧性能. 结果表明, 由Ni30Al70所得纳米多孔Ni具有多层次纳米多孔结构, 在10 mA/cm 2电流密度下析氧过电位仅为224 mV, 交换电流密度为0.63297 mA/cm 2, 表观活化自由能为40.297 kJ/mol, 经1000次循环后, 过电位降低了5 mV(j=10 mA/cm 2), 表现出良好的催化稳定性和耐久性; 热处理氧化降低了NiO的比表面积与电化学活性面积, 平衡电位下扩散传质速率明显减小, 析氧活性较Ni电极有所下降.

关键词: 快速凝固, 脱合金化, 纳米多孔镍, 电催化活性, 析氧反应

Abstract:

Nanoporous Ni was prepared by a combined method of rapid quenching and dealloying, and then the prepared samples were heat-treated to synthesize the nanoporous NiO. The phase, morphology, microstructure and pore-size distribution of nanoporous Ni and NiO were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and N2 adsorption-desorption analysis, respectively. Their electrochemical performance was investigated by cyclic voltammetry, electrochemical stea-dy-state polarization and electrochemical impendence spectroscopy(EIS). The results show that the nanoporous Ni obtained from Ni30Al70 has multi-stage nanoporous structure, when the current density is 10 mA/cm 2, the oxygen evolution overpotential is only 224 mV, the exchange current density is 0.63297 mA/cm 2, and the apparent activation free energy is 40.297 kJ/mol; after 1000 cycles of voltammetry, the overpotential decreases by 5 mV(j=10 mA/cm 2), showing fine catalysis stability and durability.

Key words: Rapid quenching, Dealloying, Nanoporous Ni, Electrocatalytic activity, Oxygen evolution reaction

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