Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (02): 387-392.doi: 10.3866/PKU.WHXB201111241

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Glycerol-Assisted Synthesis and Electrochemical Properties of Co3O4 Nanowires

ZHANG Guo-Liang1, ZHAO Dan1, GUO Pei-Zhi1, WEI Zhong-Bin1, ZHAO Xiu-Song1,2   

  1. 1. Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, School of Chemistry, Chemical Engineering and Environmental Sciences, Qingdao University, Qingdao 266071, Shandong Province, P. R. China;
    2. School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
  • Received:2011-10-11 Revised:2011-11-18 Published:2012-01-11
  • Contact: GUO Pei-Zhi;
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20803037, 21143006), Natural Science Foundation of Shandong Province, China (ZR2009BM013), and Foundation of Qingdao Municipal Science and Technology Commission, China (11-2-4-2-(8)-jch).

Abstract: Cobalt oxide (Co3O4) nanowires were controllably synthesized using glycerol and Co(NO3)2 as reagents and adjustment of the experimental parameters. The morphology and structure of the asprepared products were characterized by a series of techniques such as X-ray podwer diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical performance of the nanowires was studied by cyclic voltammetry (CV) and galvanostatic charge-discharge measurements. It was found that two pairs of redox peaks appeared in the CV curves of Co3O4 nanowire electrodes at low scan rates. The specific capacitance of the Co3O4 nanowire electrodes was 163 F·g-1 at a current density of 1 A·g-1, according to the galvanostatic charge-discharge measurements. Cycle stability tests showed that the specific capacitance increased over the first tens of cycles and then reduced slowly. After 1000 cycles, the capacitance retention was over 98% at 1 A·g-1 and 80% at 4 A·g-1; it then decreased obviously with further increase in cycle number. In Li-ion battery measurements, Co3O4 nanowire electrodes showed a discharge capacitance of 1124 mAh·g-1 which decreased rapidly during the cycle test. The formation mechanism and the relationship between the structure and electrochemical properties of Co3O4 nanowires were discussed based on the experimental results.

Key words: Electrode, Capacitance, Co3O4, Nanowire, Glycerol