Rate Capability fo Electric Double-Layer Capacitor (EDLC) Electrodes According to Pore Length in Spherical Porous Carbons
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Abstract
A series of spherical porous carbons were prepared via resorcinol-formaldehyde (RF) sol-gel polymerizationhylammonium bromide), wherein the carbon sphere size wascontrolled by varying the CTAB introduction time after a pre-determined period of addition reaction (termed as pre-curing). The sphere size gradually decreases with an increase in the pre-curing time within the range of 30-150nm. The carbons possess two types of pores; one inside carbon spheres (intra-particle pores) and the other at theinterstitial sites made by carbon spheres (inter-particle pores). Of the two, the surface exposed on the former wasdominant to determine the electric double-layer capacitor (EDLC) performance of porous carbons. As the intra-particlepores were generated inside RF gel spheres by gasification, the pore diameter was similar for all these carbons,or controlling the EDLC performance. The charge-dischargevoltage profiles and complex capacitance analysis consistently illustrate that the smaller-sized RF carbons deliver abetter rate capability, which must be the direct result of facilitated ion penetration into shorter pores.
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