Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (05): 981-988.doi: 10.3866/PKU.WHXB201303071

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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

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