CAJ | 학술논문

采用KOH活化高温裂解的菠菜叶,制得分级孔活性炭。低温氮气吸脱附表明利用KOH活化所制活性炭材料含有微孔、介孔和大孔,且比表面积高达2616 m2/g。 FE-SEM和FTIR表明,分级孔活性炭呈颗粒状,且表面含有富氧官能团。采用循环伏安( CV)、恒流充放电( GCD)和电化学阻抗谱( EIS)等测试技术,对分级孔活性炭进行电化学性能表征。在三电极测试体系中,分级孔活性炭在CV曲线中呈现良好矩形特征的双电层电容行为；在充放电电流密度为1 A/g下,其比电容值为238 F/g。利用该分级孔活性炭所组装的水系对称双电层电容器,其电压可达到1.2 V,同时具有可观的能量密度,较高的放电倍率及良好的电化学充放电稳定性。
채용KOH활화고온렬해적파채협,제득분급공활성탄。저온담기흡탈부표명이용KOH활화소제활성탄재료함유미공、개공화대공,차비표면적고체2616 m2/g。 FE-SEM화FTIR표명,분급공활성탄정과립상,차표면함유부양관능단。채용순배복안( CV)、항류충방전( GCD)화전화학조항보( EIS)등측시기술,대분급공활성탄진행전화학성능표정。재삼전겁측시체계중,분급공활성탄재CV곡선중정현량호구형특정적쌍전층전용행위；재충방전전류밀도위1 A/g하,기비전용치위238 F/g。이용해분급공활성탄소조장적수계대칭쌍전층전용기,기전압가체도1.2 V,동시구유가관적능량밀도,교고적방전배솔급량호적전화학충방전은정성。
Hierarchical porous activated carbon ( AC) was obtained by the carbonization of dried spinach leaves followed by acti-vation with KOH. The product was characterized by nitrogen adsorption, FT-IR, FE-SEM and electrochemical tests. The AC has a dominant number of micropores, a medium number of mesopores and a few macropores with a specific surface area up to 2 616 m2/g and a large number of oxygen-containing functional groups. The AC electrode exhibits a good double-layer capacitive behavior with a specific capacitance of 238 F/g in a 2 mol/L KOH electrolyte. A supercapacitor made of the AC has a high energy density of 10.1Wh/Kg at a current density of 0.5A/g and an excellent cyclic stability for 2000 cycles over a potential range from 0 to 1.2V.