高功率超级电容器用介孔炭电极材料

Mesoporous Carbon for High Power Supercapacitors

以纳米CaCO，为模板、蔗糖为前躯体制备超级电容器用介孔炭电极材料．材料的结构由氮吸附、TEM表征，借助恒流充放电、循环伏安和交流阻抗评价了其在6mol·L^-1KOH电解液中的电化学电容性能．结果表明，蔗糖基介孔炭的比表面积606m^2／g，富含10～30nm的介孔．恒流放电法测得介孔炭在电流密度50mA／g下的比电容为125F／g，大电流倍率性能特别突出．电流密度增大到20000mA／g，比电容还保持有88F／g，远高于进121电容炭，该介孔炭是一种很有前景的高功率超级电容器炭电极材料．

Mesoporous carbon for supercapacitors was prepared from sucrose using nano-CaCO3 as template. The microstructure of the carbon was characterized with N2 adsorption and transmission electron microscopy （TEM） observation. The electrochemical performances were evaluated in 6mol · L^-1 KOH aqueous electrolyte with galvanostatic charge/discharge, cyclic, vohammetry, and ac impedance spectroscopy. The sucrose-based mesoporous carbon had a surface area of 606 m^2/g and enriched mesopores in the range of 10 - 30 nm. The mesoporous carbon presented a specific capacitance of 125 F/g at a current density of 50 mA/g and outstanding excellent rate performance. As the current density increased to 20 000 mA/g, its capacitance remained at 88 F/g, much higher than the commercial capacitive carbon, indicating that the mesoporous carbon is a promising electrode material for high power supercapacitors.