Porous carbons with large meso/macropore surface areas were prepared by the colloidal-crystal-templating
technique. The porous carbons exibited extremely high specific electrochemical double layer (EDL) capacitance
of 200−350 F g-1 in an aqueous electrolyte (1 M H2SO4). The pore structure dependence of the capacitance
was studied mainly by means of cyclic voltammetry and is discussed in detail. From the sweep rate dependence
of the series resistance and capacitance, it was found that the ion-penetration depth at the porous electrode
surface was finite and decreased with an increasing sweep rate. Peaks around the point of zero charge, which
were observed in addition to typical rectangular voltammograms, were explained well by the potential drop
in pores. The surface area dependence of the capacitance revealed that the contribution of the meso/macropore
surface is as great as that of the plane electrodes and that only the part of the micropore surface adjacent to
the opening mouths is effective.
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