CAJ | 학술논문

以豌豆荚为碳源、ZnCl2或KOH为活化剂制备了活性炭,并用作双电层电容器的电极材料.采用比表面及孔隙度分析仪表征了豌豆荚基活性炭的孔结构.通过KOH或ZnCl2活化后,活性炭比表面积从1.69 m2·g-1增大到2237或621 m2·g-1.采用循环伏安法和恒流充放电测试技术表征了豌豆荚基活性炭的电化学特性.结果表明:在6 mol·L-1KOH溶液中经KOH活化处理的活性炭的质量比电容高达297.5 F·g-1并具有良好的充放电稳定性,在5A·g-1的高电流密度下循环充放电500次后,质量比电容仅衰减8.6%.
이완두협위탄원、ZnCl2혹KOH위활화제제비료활성탄,병용작쌍전층전용기적전겁재료.채용비표면급공극도분석의표정료완두협기활성탄적공결구.통과KOH혹ZnCl2활화후,활성탄비표면적종1.69 m2·g-1증대도2237혹621 m2·g-1.채용순배복안법화항류충방전측시기술표정료완두협기활성탄적전화학특성.결과표명:재6 mol·L-1KOH용액중경KOH활화처리적활성탄적질량비전용고체297.5 F·g-1병구유량호적충방전은정성,재5A·g-1적고전류밀도하순배충방전500차후,질량비전용부쇠감8.6%.
Activated carbons for electrochemical double-layer capacitor electrodes were prepared frompeasecod-based carbons using ZnCl2 or KOH as activating agents. The pore structures of the prepared activated carbon materials were characterized using N2 adsorption. The specific surface area of the peasecod-based carbon materials increased obviously from 1.69 m2· g-1 to 2237 m2· g-1 by KOH activation and to 621 m2· g-1 by ZnCl2 treatment. The electrochemical properties of the prepared peasecod-based activated carbon materials were evaluated by cyclic voltammetry and galvanostatic charge-discharge, and a specific capacitance as high as 297.5 F· g-1 in 6 mol· L-1 KOH aqueous electrolyte was obtained for the KOH-treated carbon material. Additionally, the KOH-activated peasecod-based carbon material showed excellent long-term charge-discharge cycle stability and a 8.6% decrease in the specific capacitance was observed at a high current density of 5 A·g-1 after 500 cycles.