植酸/金属离子共掺杂聚苯胺/纤维素复合材料的制备与电化学性能研究

Preparation and electrochemical performance of phytic acid/metal ion co-doped polyaniline/cellulose composites

以再生纤维素微球为基底,通过原位聚合法制备了金属离子与植酸共掺杂的聚苯胺/纤维素复合材料,采用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、X射线粉末衍射仪(XRD)、热重分析仪(TGA)和比表面积分析仪(BET)对材料进行了表征,并探究了不同金属离子掺杂对复合材料电化学性能的影响。结果表明,与纯聚苯胺相比,以再生纤维素微球为基底的聚苯胺/纤维素复合材料的倍率性能、导电性均有大幅提升,锌离子、锂离子分别与植酸共掺杂后制备的聚苯胺/纤维素复合材料,在5 mV/s的扫描速率下比电容分别为343 F/g、332 F/g,远大于单一植酸掺杂的复合材料的比电容(286 F/g);对锌离子、锂离子掺杂的复合材料进行了300次充放电测试后,其比电容保持率分别为87%、88%,均高于未经金属离子掺杂的复合材料的比电容保持率(83%),表明锌离子与锂离子掺杂可提升复合材料的循环稳定性。

Polyaniline/cellulose composites doped with phytic acid and metal ions have been prepared by in situ polymerization using regenerated cellulose microspheres as a substrate.The materials were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),X-ray powder diffraction(XRD),thermogravimetry(TG)and specific surface area analysis(BET),and the effects of doping with different metal ions on the electrochemical performances of the composites were investigated.The results showed that the rate capability and electrical conductivity of the polyaniline/cellulose composites were greatly improved when compared with pure polyaniline.Furthermore,at a scanning rate of 5 mV/s,the specific capacitances of the composites codoped with zinc ions or lithium ions and phytic acid were 343 F/g and 332 F/g,respectively,values which are much higher than that of the polyaniline/cellulose composite doped with phytic acid alone(286 F/g).After charge-discharge tests(300 cycles),the specific capacitance retention rates of the zinc and lithium ion doped composites were 87%and 88%,respectively,values which are slightly higher than that of the non-metal ion doped composites(83%).The results show that doping with zinc or lithium ions can effectively improve the cycle stability of composite materials.