物理化学学报 >> 2012, Vol. 28 >> Issue (12): 2874-2878.doi: 10.3866/PKU.WHXB201209063

电化学和新能源 上一篇    下一篇

静电纺丝法制备的钴酸镍微米带的磁性以及电化学性能

朱福良1, 赵景新1,2, 程永亮2, 李海宝1, 阎兴斌2   

  1. 1 兰州理工大学材料科学与工程学院, 兰州 730050;
    2 中国科学院兰州化学物理研究所, 清洁能源化学与材料实验室, 兰州 730000
  • 收稿日期:2012-07-02 修回日期:2012-09-06 发布日期:2012-11-14
  • 通讯作者: 朱福良, 阎兴斌 E-mail:chzfl@lut.cn; xbyan@licp.cas.cn
  • 基金资助:

    甘肃省自然科学基金(3ZS042-B25-029)和国家自然科学基金(51005225)资助项目

Magnetic and Electrochemical Properties of NiCo2O4 Microbelts Fabricated by Electrospinning

ZHU Fu-Liang1, ZHAO Jing-Xin1,2, CHENG Yong-Liang2, LI Hai-Bao1, YAN Xing-Bin2   

  1. 1 School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China;
    2 Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000,P. R. China
  • Received:2012-07-02 Revised:2012-09-06 Published:2012-11-14
  • Supported by:

    The project was supported by the Natural Science Foundation of Gansu Province, China (3ZS042-B25-029) and National Natural Science Foundation of China (51005225).

摘要:

通过直接退火静电纺丝前驱样品以及调节升温速率最终得到了钴酸镍(NiCo2O4)微米带. 通过X射线衍射、扫描电镜、振动样品磁强计以及电化学工作站等分析手段对钴酸镍微米带的晶体结构、形貌、磁学性能以及电化学性能进行了研究. 结果显示, 以1℃·min-1的升温速率得到的NiCo2O4微米带属于立方尖晶石结构, 高温处理后仍能保持一维结构. 室温磁化结果显示制备的NiCo2O4微米带具有超顺磁性, 在10 kOe时磁化强度为6.35 emu·g-1. 此外, 电化学测试结果显示, NiCo2O4微米带的电容特性是典型的赝电容, 并且比电容随着放电电流密度的增加而减小.

关键词: NiCo2O4, 微米带, 磁学性能, 电化学性能, 倍率性能

Abstract:

Cobaltate nickel (NiCo2O4) microbelts were fabricated by direct calcination of electrospun precursor samples with an appropriate heating rate. The crystal structure, morphology, magnetic properties, and electrochemical properties of the NiCo2O4 microbelts were investigated by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and electrochemical analysis. The results showed that a heating rate of 1℃·min-1 resulted in the formation of cubic spinel NiCo2O4 microbelts. After calcination at high temperatures, the microbelts retained their one-dimensional structure. Magnetization results indicated that the NiCo2O4 microbelts were superparamagnetic and their magnetization value at 10 kOe was 6.35 emu·g-1. Moreover, the electrochemical results suggest that the capacitance of the NiCo2O4 microbelts is typical pseudocapacitive capacitance, and the value of the specific capacitance gradually decreases with increasing discharge current density.

Key words: NiCo2O4, Microbelt, Magnetic property, Electrochemical property, Rate capability

MSC2000: 

  • O646