H_6PMo_9V_3O_(40)/PANI复合电极材料的电容特性研究

Research on the capacitance properties of H_6PMo_9V_3O_(40)/PANI composite materials

采用超声氧化聚合法，以自制杂多酸H6PMo9V3O40作为质子酸掺杂剂兼辅助氧化剂，配合过硫酸铵（APS）氧化剂，合成了聚苯胺基复合电容材料H6PMo9V3O40／PANI。以此复合材料为活性物质制备电极，在0．5mol／LH2SO4电解液体系中，通过循环伏安、恒电流充放电和交流阻抗等技术研究其电化学性能。结果表明，H6PMo9V3O40／PANI电极体现出优良的法拉第赝电容特征，循环稳定性能良好，且大电流下充放电特征明显。在-0．1～0．7V（VS．SCE）电压和1．5A／g电流密度下，首次充电比电容量160．643F／g，放电比电容量153．225F／g，充放电效率95．38％，500次循环后，充电比电容量140．543F／g，衰减率12．51％，放电比电容量139．528F／g，衰减率8．94％，充放电效率99．27％。

Using homemade H6PMo9V3O40 as dopant and auxiliary oxidant,and ammonium persulfate（APS） as oxidant, composite capacitor material H6PMo9V3O40/PANI was synthesized by ultrasonic oxidative polymerization. The electrochemical per- formances of the material were researched via cyclic voltammetry,galvanostatic charge-discharge and alternating current impedance techniques,in which the active electrode material was made of H6PMo9V3O40/PANI and the electrolyte was 0.5mol/L H2SO4 aqueous solution. The results showed that the electrode material exhibited excellent Faraday pseudocapacitance properties, such as the good cycling stability, as well as the evident charge-discharge characteristic in higher current. The initial charge specific capacitance was 160. 643F/g,the discharge specific capacitance was 153. 225F/g and the charge-discharge efficiency was 95. 380/oo in the range of -0.1 ～0.7 V voltage （vs. SCE） and at the 1.5A/g current density. The charge specific capacitance was 140. 543F/g and the decay rate was 12.51%. Then, the discharge specific capacitance was 139. 528F/g and the decay rate was 8.94 % . In addition,the charge-discharge efficiency was 99.27 % at the 500th chargedischarge cycle.