Synthesis and Characterization of Nd 2 Fe 14 B/PANI and Its Function during the Oxygen Transfer Process

Nd_2Fe_(14)B/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 Nd_2Fe_(14)B/PANI in the oxygen transfer process was determined using an electrochemical three electrode system and a zinc air battery.The results showed that Nd_2Fe_(14)B/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·m~2·kg~(-1).For a 0.40 mg·cm~(-2) Nd_2Fe_(14)B/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 Nd_2Fe_(14)B/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.