Activated graphitizing carbons, mesophase carbons prepared by alkaline activation for electrochemical Capacitors (Electric double-layer capacitors; EDLCs) with organic liquid electrolytes showed larger specific capacitance per unit volume (F/cm(3)) than those of conventional activated carbon materials. The physical characteristic is lower specific surface area, compared with a conventional activated carbon. It has been supposed that the electric double-layer interfaces of alkaline activated mesophase carbon which have high density per unit volume were dominated by the edge plane of hexagonal lattice, compared with those of conventional activated carbon material.