聚合物支撑法制备活性炭膜材料及其超级电容性能

Enhanced electrochemical performance of activated carbon membrane prepared via in-situ supporting of polymer for supercapacitor application

利用聚合物支撑法制备活性炭基碳膜材料,应用于超级电容器电极材料。研究了浓酸改性时聚合物支撑对碳膜的结构和电化学性能的影响。采用扫描电镜(SEM)、氮气等温吸脱附(BET)等方法表征材料的微观结构,采用循环伏安、恒流充放电和交流阻抗等研究其电化学电容性能。结果表明,聚合物支撑法制备的碳膜在1 A·g^(–1)的电流密度下的比电容为128.9 F·g^(–1),低于纯活性炭的比容量(173.3 F·g^(–1));但是,该碳膜在浓酸改性后的比电容达到了185.6 F·g^(–1),远高于浓酸改性的活性炭(71.1 F·g^(–1))。主要原因是支撑聚合物在高温热处理留下的碳基支撑点对于活性炭丰富的孔道结构具有保护作用。

The activated carbon membrane fabricated via in-situ supporting of polymer was used as an electrode material for the application in supercapacitor. And the influences of modification using concentrated acid on structure and electrochemical properties were investigated by cyclic voltammetry, charge-discharge tests and impedance spectroscopy. The results show that the prepared carbon films display a specific capacitance of 128.9 F·g^（–1） at a current density of 1 A·g–1, which is lower than that of pure activated carbon capacity 173.3 F·g–1; however, the carbon film modified by using concentrated acid display a high specific capacitance of 185.6 F·g–1, which is far higher than that of modified activated carbon 71.1 F·g–1. The main reason is that the supporting point left by the supporting polymer in the high temperature heat treatment has the protective effect on the porous structure of the activated carbon.