Isotropic pitch-based carbon fiber was isothermally activated in CO2 atmosphere. Structural parameters of the isotropic carbon fibers and activated carbon fibers (ACFs) were evaluated by X-ray diffraction (XRD). The d002 and La of the carbon fibers were measured to be 4.04 a and 23.6 a and those of ACFs were 4.29 a and 22.7 a, respectively, representing less ordered through activation process. The pores in the ACFs were characterized by BET, and they showed super-high specific surface area of maximum value 3,495 m2/g from average pore size of 8.3 a at 59% burn-off. It was recognized that 8-9 a was optimum range of pore size for efficient creation of high specific surface area. The average size of the pores formed at higher temperature (1100℃) was larger than that of the pores formed at lower temperature (900℃).

• Jae-Seung Roh(School of Materials Science and Engineering, The University of New South Wales)
• Dong-Soo Suhr(Department of Materials Engineering, Chungnam National University)