화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.388, 543-549, 2002
Double layer capacitance of porous carbons derived from defluorination of PTFE
Highly mesoporous carbon material was prepared from defluorination of PTFE with lithium naphthalenide (LiC10H8 ; radical anion), and its double layer capacitance was measured in 1.0 M LiClO4 /propylene carbonate. The reaction product of PTFE film with LiC10H8 had micro/nano domain structure consisting of one dimensional carbon chain (carbyne-like structure) and LiF. Although the carbon chain easily decomposed to amorphous carbon structure by chain crosslinking and LiF condensation through air exposure, highly mesoporous carbon was obtained by removal of fine LiF particles with dilute HClaq. This mesoporous carbon (PCPTFEr) showed larger capacitance (BET surface area: 1137 m(2) g(-1) , capacitance: 123 F g(-1)) than activated carbon fiber with the almost same BET surface area (1151 m(2) g(-1) , 74 F g(-1)). Additionally, PCPTFEr maintained the capacitance even at high current density. These properties of PCPTFEr can be due to the matrix carbon structure and, especially, the pore structure.