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| - Electrochemical Study of High Electrochemical Double Layer Capacitance of OrderedPorous Carbons with Both Meso/Macropores and Micropores
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| - Porous carbons with large meso/macropore surface areas were prepared by the colloidal-crystal-templatingtechnique. The porous carbons exibited extremely high specific electrochemical double layer (EDL) capacitanceof 200−350 F g-1 in an aqueous electrolyte (1 M H2SO4). The pore structure dependence of the capacitancewas studied mainly by means of cyclic voltammetry and is discussed in detail. From the sweep rate dependenceof the series resistance and capacitance, it was found that the ion-penetration depth at the porous electrodesurface was finite and decreased with an increasing sweep rate. Peaks around the point of zero charge, whichwere observed in addition to typical rectangular voltammograms, were explained well by the potential dropin pores. The surface area dependence of the capacitance revealed that the contribution of the meso/macroporesurface is as great as that of the plane electrodes and that only the part of the micropore surface adjacent tothe opening mouths is effective.
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