The volumetric capacitance of microporous carbons in organic electrolyte

The study of 26 microporous carbons with average pore widths L-o between 0.7 and 1.8 nm shows that the volume-related capacitance C-mi (F cm(-3)) in the organic electrolyte (C2H5)(4)NBF4/acetonitrile is an inverse function of the average micropore width L-o. This means that for a given micropore volume W-o, the gravimetric capacitance C (F g(-1)) is larger for carbons with smaller pores due to the higher surface to volume ratio. Furthermore, the increase of C-mi (F cm(-3)) in smaller pores suggests that the surface-related capacitance C (F m(-2)) should be relatively constant in slit-shaped micropores. This has important technological consequences for the design of carbon-based supercapacitors. (C) 2011 Elsevier B.V. All rights reserved.