Synthesis of Sub-nanometer Porous Carbon Film for Energy Storage.

Carbon-based supercapacitors are a kind of supercapacitors with very promising applications because of their low cost, good stability and adjustable properties. Simple and rapid syntheses of carbon materials with a high surface area and narrow pore size distribution are of great significance to practical applications of carbon-based supercapacitors. Here we report a new strategy to synthesize sub-nanometer porous carbon films (Snp-CF) via a condensation reaction under mild conditions. Carbon films exhibit a narrow pore size distribution (6.6 Å) and high surface area (508 m2  g-1 ) after annealing at 700 °C. Snp-CF-700 displays a good specific capacity and excellent cycle performance (130 F g-1 after 5000 cycles, 118 % of initial 110 F g-1 ).