超级电容器复合材料MnO_2/活性炭的研究

Study on MnO_2/activated carbon as composite electrode materials for supercapacitors

采用化学共沉淀法制备了α MnO2·nH2O和活性炭的复合电极材料,对其结构和形貌分别用XRD和SEM进行了表征。循环伏安、交流阻抗以及恒流充放电等测试结果表明复合电极材料比α MnO2·nH2O或活性炭电极具有更好的电化学可逆性和理想的电化学电容行为。随活性物质量增加,复合电极的比电容量增长率趋于稳定。

MnO2/activated carbon composite electrode materials were prepared by a chemical coprecipitation method. Their structure and morphology were characterized by XRD and SEM respectively. The results show that MnO2/activated carbon composite electrode materials have better electrochemical kinetic reversibility and ideal capacitor performance than those of αMnO2·nH2O or activated carbon electrode by CV, alternating current impedance and constant current charge/discharge tests. The specific capacitance of composite electrodes keep constant with increase of active material.