Abstract
This chapter discusses the double layer capacitances of the activated carbon fibers (ACFs) with mesopores (mesoporous ACF). The electric double layer capacitance of the porous carbon electrodes depends on its pore size distribution. The mesoporous ACFs—prepared by the carbonization and steam-activation of a phenolic resin fiber containing a small amount of activation catalyst, have many mesopores in addition to the well-developed micropore structure. Experimentation showed that the double layer capacitance in propylene carbonate electrolytes was not proportional to the BET specific surface area for mesoporous ACFs. This is due to the low mobility of the ions in the narrow micropores. However, the mesoporous ACFs showed higher double layer capacitance than conventional ACFs consisting of mainly micropores—in the case of high current density measurements. Such a result suggests that the presence of mesopores promotes the formation of an effective double layer or the fast transfer of ions to the micropores. The chapter concludes by discussing the property of the double layer capacitance for the single walled carbon nanotubes (SWCNT) from the viewpoint of a comparison with the ACFs.
Published Version
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