Abstract The dependence of electric double layer capacitance on the pore structure of commercially available activated carbons in both nonaqueous and aqueous electrolytes was studied. Capacitance in the nonaqueous electrolyte (propylene carbonate solution of 1 mol/L triethyl-methyl-ammonium tetrafluoroborate) was linearly related to that in the aqueous electrolyte (1 mol/L H2SO4 solution). The…