镧离子电化学掺杂聚苯胺薄膜电极及其电容性能

Electrochemical polymerization of polyaniline doped with La^(3+) as the electrode material for electrochemical supercapacitor

采用循环伏安法(CV)制备了聚苯胺(PANI)和掺杂镧离子的聚苯胺(PANI/La^(3+))薄膜电极。利用傅里叶红外光谱、X射线衍射、场发射扫描电镜和X射线能谱仪对其结构和形貌进行了分析。通过循环伏安、恒流充放电(CP)及交流阻抗(EIS)等测试其电化学性能。结果表明,在0.5mol/L H_2SO_4电解液中,当电流密度为5mA/cm^2时,掺杂镧离子的聚苯胺比电容相对聚苯胺薄膜电极提高了100F/g,且镧离子掺杂后的聚苯胺循环稳定性明显改善。

Polyaniline（PANI）films and polyaniline doped with La3＋（PANI/La3＋）films were synthesized by cyclic voltammetry（CV）.The effects of La3＋concentration on the structure and morphology of PANI films and PANI/La3＋films were characterized by FI-IR,XRD,SEM and EDS.And electrochemical performance of PANI films and PANI/La3＋films were tested by cyclic voltammetry,galvanostatic charge-discharge test（CP）and electrochemical impedance spectroscopy（EIS）.The results suggest that the PANI/La3＋films show a larger specific capacitance of 100F/g and better cycle stability,in 0.5mol/L H2SO4 electrolyte,at a current density of 5mA/cm,compared with the pure PANI film.