| 초록 |
Activated carbons nanofibers (ACNFs) were prepared from a polyacrylonitrile precursor using CO2 activation methods with activation time. The surface and structural characteristics of ACNFs were observed by scanning electron microscopy and X-ray diffraction, respectively. Pore characteristics were investigated by N2/77K adsorption isotherms. From the results, specific surface areas and total pore volume of the porous carbon were determined as 360~1530 m2/g and 0.17~0.82 cm3/g, respectively. The activation times has a marked effect on both the porosity structure and the electrochemical performances of ACNFs. An increase of activation times results in higher specific surface area and larger pore size, and hence higher capacitance and better rate capability. |
