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The paper reviews the features of porous carbons obtained from polytetrafluoroethylene (PTFE) defluorinated with alkali metals, and its application to electric double layer capacitance (EDLC). The carbons prepared possess high BET specific surface areas with large amount of narrow mesopores as well as micropores. The formation mechanisms of these carbons are also described and compared with those prepared from PTFE defluorinated with alkali cation-naphthalene anion radical complex. In the EDLC application, the carbons show larger capacitance values compared with the existing activated carbons having similar surface areas. The results are discussed on the basis of the relaxation of strong ion-sieving effect and ion transfer due to the presence of mesopores.

Preparation of porous carbon by defluorination of PTFE and its application to electric double layer capacitor