物理化学学报 >> 2013, Vol. 29 >> Issue (05): 981-988.doi: 10.3866/PKU.WHXB201303071

电化学和新能源 上一篇    下一篇

Ni/NiCo2O4电极的制备及其析氧反应性能

王森林, 王丽品, 张振洪   

  1. 华侨大学材料科学与工程学院应用化学系, 福建 厦门 361021
  • 收稿日期:2012-11-30 修回日期:2013-03-05 发布日期:2013-04-24
  • 通讯作者: 王森林 E-mail:slwang@hqu.edu.cn

Preparation and Oxygen Evolution Reaction Performance of Ni/NiCo2O4 Electrode

WANG Sen-Lin, WANG Li-Pin, ZHANG Zhen-Hong   

  1. Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, P. R. China
  • Received:2012-11-30 Revised:2013-03-05 Published:2013-04-24

摘要:

采用溶胶-凝胶法制备NiCo2O4尖晶石粉体, 然后以多孔Ni 为基体, 通过复合溶胶涂覆结合烧结制备Ni/NiCo2O4 涂层电极. 运用扫描电子显微镜(SEM)、能量色散谱(EDS)和X 射线衍射(XRD)表征粉体以及Ni/NiCo2O4涂层电极的组成和结构. 采用循环伏安(CV), 稳态极化(LSV), 电化学阻抗谱(EIS), 恒电位阶跃以及恒电位长时间电解研究涂层电极在5 mol·L-1 KOH溶液中的电催化析氧反应(OER). 结果表明: Ni/NiCo2O4涂层电极与多孔Ni 电极对比, 具有低的析氧过电位、高的比表面积和高的稳定性能; 其中比表面积增大了28.69倍,表观活化能在不同过电位分别降低了166.78和162.15 kJ·mol-1.

关键词: 溶胶-凝胶, NiCo2O4, 多孔镍, 析氧反应, 电催化

Abstract:

Spinel-type NiCo2O4 powders were prepared by a sol-gel method, and Ni/NiCo2O4 electrode was prepared through composite sol method combined with sintering. The composition and structure of Ni/ NiCo2O4 were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energydispersive X-ray spectroscopy (EDS). Electrocatalytic properties of the Ni/NiCo2O4 electrode in the oxygen evolution reaction (OER) were studied in 5 mol·L-1 KOH solution, using cyclic voltammertry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), chronoamperometry, and extended duration constant potential electrolysis. The Ni/NiCo2O4 electrode exhibited a lower OER overpotential, higher specific surface area, and better stability than a porous Ni electrode. The specific surface area of the Ni/NiCo2O4 electrode was 28.69 times greater than that of the porous Ni electrode, and its apparent activation energies decrease 166.78 and 162.15 kJ·mol-1 at different overpotentials, respectively.

Key words: Sol-gel, NiCo2O4, Porous nickel, Oxygen evolution reaction, Electrocatalysis

MSC2000: 

  • O646