열처리 온도에 의한 피치계 활성탄소섬유의 기공구조 변화가 전기화학적 특성에 미치는 영향

Abstract

In this study, electrochemical properties of pitch-based activated carbon fibers (ACFs) were investigated by different heat-treatment temperature of the pitch-based ACFs in order to improve the specific capacitance of electric double-layer capacitor (EDLC). The ACFs were prepared by different heat-treatment temperatures of 1050 and , after activation with 4 M KOH at using stabilized pitch fiber. The specific surface area of prepared ACFs increased from to , also the micropore and mesopore volumes of prepared ACFs were increased. These results because pore was produced by desorbing oxygen and hydrogen elements within the ACFs, and pore size was increased by contraction ACFs by heat-treatment process. Because of the porous properties, the specific capacitance was increased from 73 F/g to 119 F/g using cyclic voltammetry with 1 M at scan rates of 5 mV/s.