由柏木制备纳米孔结构炭材料Ⅱ.电双层电容器中的应用

摘要

通过过热蒸气活化法制备的柏木炭中含有大量的中孔,可用于制备以1 mol/L硫酸为电解液的双电层电容器(EDLCs).在50 mA/g电流密度下,柏木炭的质量比电容(C50)为190 F/g;在1 000 mA/g电流密度下,其质量比电容(C1000)为140 F/g.按C1000/C50定义的性能倍率约为0.72.测得的高电容量可归因于微孔和大孔所造成表面的贡献.以简易浸泡法负载少量NiO粒子后,柏木炭的质量比电容可以提高约13%,体积比电容提高约27%,而其性能倍率保持不变.%Cypress charcoals, which were prepared under super-heated steam and had a relatively large amount of mesopores, were used in electric double layer capacitors (EDLCs) in 1 mol/L H2SO4 electrolyte. The gravimetric capacitance of cypress charcoals was about 190 F/g at a current density of 50 mA/g (C50) and 140 F/g at 1 000 mA/g (C1000) and the performance rating defined by C1000/C50 was about 0.72. The capacitance observed was explained by the contributions from the surfaces from the micropores and the larger pores. By loading minute NiO particles through a simple impregnating process, the capacitance of the loaded charcoals was enhanced by about 13% in gravimetric capacitance and by about 27% in volumetric capacitance and the performance rating was kept the same.