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A nanocomposite material based on polyfluorene (PF) loaded with a carbon black, namely Ketjen Black (KB), was investigated electrochemically as a cathode material for high-energy electrochemical capacitors. The nanocomposite was prepared by a chemical oxidation of fluorene monomer dissolved in the KB suspension. From TEM observation, thin PF films with 5-15 nm in thickness were loaded onto the surface of the aggregated KB particles. The nanocomposite based capacitor electrode exhibited high specific capacitance of 160 F g−1 (260 F g−1 per PF mass) in an electrolyte of 1 M tetraethylammonium tetrafluoroborate/propylene carbonate. More importantly, the charge was found to be stored at high potential ranged from 0.4 to 1.0 V vs. Ag/Ag+, which is higher than the redox potentials for conventional conducting polymers.

Polyfluorene/Carbon Nanocomposite for Electrochemical Capacitors