V_2O_5氧化聚合制备多孔片状聚苯胺及其电化学性能

Sheet-like porous polyaniline prepared by V_2O_5 as oxidant and its electrochemical performance

用V_2O_5为氧化剂,采用水热法制备了片状多孔聚苯胺。采用扫描电子显微镜、红外光谱、X射线衍射等方法对其结构进行了表征;采用循环伏安、恒流充放电、交流阻抗等方法研究了其电化学性能;研究了苯胺单体与V_2O_5的质量比对所制备的聚苯胺电化学性能的影响。结果表明:制备的聚苯胺为片状,且呈现多孔结构;当苯胺单体与V_2O_5的质量比为1:3时,制备的样品比电容最高,达到147.3 F/g;在2 A/g的电流密度下,在循环1 000圈后,可以保持40%的容量,同时库仑效率几乎保持100%。

A simple hydrothermal method was used to synthesize a sheet-like porous polyaniline using the W205 as the oxidizing agent. Scan electron microscopy （SEM）, fourier transform infi＇ared （FTIR） and X-ray diffraction （XRD） were used to characterize the structure of polyaniline; and cyclic voltarnmetry （CV）, charge-discharge tests and electrochemical impedance spectroscopy （EIS） were used to test its electrochemical properties. The effects of mass ratio of aniline to V205 on the electrochemical performances of the obtained polyaniline were investigated. The prepared polyaniline exhibites flake and porous structure. Moreover, the results show that a highest specific capacitance of 147.3 F/g is obtained when the mass ratio of aniline to V205 is 1：3, and capacitance retention of 40% is obtained at 2 A/g after 1 000 cycles. Notably, the Coulomb efficiency keeps 100% simultaneously during the process of cycling.