9,10-蒽醌-2-磺酸钠盐掺杂对导电聚吡咯电容性能的促进作用

Improved Capacitive Performance of Polypyrrole Doped with 9,10-Anthraquinone-2-sulfonic Acid Sodium Salt

用恒电位法制成以9,10-蒽醌-2-磺酸钠盐(AQS)为掺杂阴离子的导电聚吡咯(PPy)电化学电容器电极材料,并采用循环伏安(CV)、充放电测试、电化学阻抗(EIS)等方法表征电容性质.结果表明,与高氯酸阴离子(ClO4-)掺杂的PPy相比,PPy/AQS电极材料不仅单位质量电容和电极稳定性得到提高,工作电压范围也得以扩大.在1mol·L-1的氯化钾中,工作电压为-0.6至0.6V,扫描速率为50mV·s-1时其单位质量电容达到491F·g-1,比PPy/ClO4-电极材料提高1.5倍.这是由于AQS自身良好的氧化还原活性和AQS掺杂有利于聚吡咯膜形成疏松多孔的纳米及亚微米颗粒结构而导致的.

A polypyrrole（PPy）/9,10-anthraquinone-2-sulfonic acid sodium salt （AQS） composite electrode was prepared by constant-potential electropolymerization using AQS as a counter-ion. Cyclic voltammetry （CV）, galvanostatic charge-discharge, and electrochemical impedance spectroscopy （EIS） were used to evaluate its capacitance performance. Experimental results show that the AQS dopant results in an improved specific capacitance, increased long-cycle stability, and a wide working potential range compared to that of using ClO4- as the dopant. The PPy/AQS composite electrode has a specific capacitance of 491 F·g-1 at a CV scan rate of 50 mV·s-1 within a potential range of -0.6 to 0.6 V in 1 mol·L-1 KCl, which is 1.5 times more than that with a PPy/ClO 4- composite electrode. The improvement in capacitance should be attributed to the good redox performance of AQS and the porous submicron/ nanosized structure of the resulting composite film.