物理化学学报 >> 2012, Vol. 28 >> Issue (02): 387-392.doi: 10.3866/PKU.WHXB201111241

电化学和新能源 上一篇    下一篇

Co3O4纳米线的丙三醇辅助合成及其电化学性质

张国梁1, 赵丹1, 郭培志1, 位忠斌1, 赵修松1,2   

  1. 1. 青岛大学化学化工与环境学院, 纤维新材料与现代纺织国家重点实验室培育基地, 山东青岛266071;
    2. School of Chemical Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
  • 收稿日期:2011-10-11 修回日期:2011-11-18 发布日期:2012-01-11
  • 通讯作者: 郭培志 E-mail:pzguo@qdu.edu.cn; guopz77@yahoo.com
  • 基金资助:

    国家自然科学基金(20803037, 21143006), 山东省自然科学基金(ZR2009BM013)和青岛市应用基础研究项目(11-2-4-2-(8)-jch)资助

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 E-mail:pzguo@qdu.edu.cn; guopz77@yahoo.com
  • 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).

摘要: 以硝酸钴和丙三醇为反应物通过反应条件的改变控制制备出Co3O4 纳米线. 利用粉末X 射线衍射(XRD), 扫描电子显微镜(SEM)和透射电子显微镜(TEM)对产物的形貌与结构进行了表征. 实验发现, 在低扫描速率下, Co3O4纳米线电极的循环伏安(CV)曲线呈现出两对氧化还原峰. 恒电流充放电实验中, 氧化钴纳米线电极在1 A·g-1电流密度下的电容为163 F·g-1; 在1和4 A·g-1条件下, 其容量随循环次数的增加先上升后下降,1000 次充放电循环后容量保持率分别在98%和80%以上, 继续增加循环次数则容量下降比较明显. 锂离子电池性质测试中, 氧化钴纳米线的放电容量为1124 mAh·g-1, 然而放电容量随循环次数增加下降较快. 基于实验结果, 对Co3O4纳米线的形成机理及其结构与电化学性质之间的关系进行了探讨.

关键词: 电极, 电容量, Co3O4, 纳米线, 丙三醇

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

MSC2000: 

  • O646