物理化学学报 >> 2011, Vol. 27 >> Issue (11): 2625-2631.doi: 10.3866/PKU.WHXB20111133

电化学和新能源 上一篇    下一篇

Nd2Fe14B/PANI磁粉的合成、表征及氧传递作用

史继诚, 徐洪峰, 卢璐, 傅杰   

  1. 大连交通大学环境与化学工程学院, 辽宁大连 116028
  • 收稿日期:2011-07-25 修回日期:2011-08-29 发布日期:2011-10-27
  • 通讯作者: 徐洪峰 E-mail:hfxu@fuelcell.com.cn
  • 基金资助:

    国家自然科学基金(20976018)和辽宁省高校优秀人才支持计划(2008RC09)资助项目

Synthesis and Characterization of Nd2Fe14B/PANI and Its Function during the Oxygen Transfer Process

SHI Ji-Cheng, XU Hong-Feng, LU Lu, FU Jie   

  1. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China
  • Received:2011-07-25 Revised:2011-08-29 Published:2011-10-27
  • Contact: XU Hong-Feng E-mail:hfxu@fuelcell.com.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20976018) and Program for Liaoning Excellent Talents in University, China (2008RC09).

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摘要： 经球磨和原位聚合法合成了Nd2Fe14B/PANI磁粉, 采用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、扫描电镜(SEM)、振动样品磁强计(VSM)对样品进行了表征, 用电化学三电极体系和锌空电池考察了Nd2Fe14B/PANI 材料在氧传递中的作用. 结果表明: Nd2Fe14B/PANI 是一维片状纳米材料, 电导率0.54 S·cm-1, 内禀矫顽力和剩余磁化强度为149.57 kA·m-1、20.27 A·m2·kg-1; Nd2Fe14B/PANI 负载密度为0.40 mg·cm-2时, 磁性电极的双电层电容增大, 传荷电阻减小, 磁性锌空电池的极化电流较大; 负载密度为3.60 mg·cm-2时, 磁性电极的双电层电容减小, 传荷电阻增大, 磁性锌空电池的极化电流较小. Nd2Fe14B/PANI 负载密度小于0.89 mg·cm-2时, 微磁场促进氧的传质, 提高锌空电池的放电性能; 高于3.56 mg·cm-2时, 微磁场抑制氧的传质, 降低锌空电池的放电性能; Nd2Fe14B/PANI中的PANI提高锌空电池的放电性能.

关键词: 磁场, 双电层电容, 传荷电阻, 氧传递, 锌空电池

Abstract: Nd2Fe14B/PANI magnetic powder was prepared by ball milling and in-situ polymerization. The samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The function of Nd2Fe14B/PANI in the oxygen transfer process was determined using an electrochemical three electrode system and a zinc air battery. The results showed that Nd2Fe14B/PANI was a one-dimensional lamellar nanostructured material with an electrical conductivity of 0.54 S·cm-1, an intrinsic coercive force of 149.57 kA·m-1, and a residual magnetization of 20.27 A·m2·kg-1. For a 0.40 mg·cm-2 Nd2Fe14B/PANI load density the magnetic electrode reached a higher double electric layer capacitance, a smaller charge transfer resistance than a nonmagnetic electrode and the polarization current of the magnetic zinc air battery also increased. For a 3.60 mg·cm-2 load density the results were contrary to those of the 0.40 mg· cm-2 load density test. We found that the micro magnetic field promoted the oxygen transfer process and improved the zinc air battery performance when the Nd2Fe14B/PANI load density was less than 0.89 mg· cm-2. At a load density higher than 3.56 mg·cm-2, the micro magnetic field inhibited oxygen transfer and reduced the zinc air battery discharge performance. The PANI in this material also improved the zinc air battery discharge performance.

Key words: Magnetic field, Double electric layer capacitance, Charge transfer resistance, Oxygen transfer, Zinc air battery

MSC2000: 

  • O646