Nd2Fe14B/PANI磁粉的合成、表征及氧传递作用

摘要

Nd2Fei4B/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 Nd2Fe?B/PANI in the oxygen transfer process was determined using an electrochemical three electrode system and a zinc air battery. The results showed that Nd2FeuB/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-rrr and a residual magnetization of 20.27 A-m2-kg"1. For a 0.40 mg-crrr2 Nd2Fei4B/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 Nd2FeHB/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.%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.