Effect of Surface Area of Ultramicro-, Micro-, and Mesopores on Electric Double-Layer Capacitance of Ordered Mesoporous Carbons

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Ordered mesoporous carbons (COU-1, COU-2) were synthesized by a soft-templating method. The COU-1 and COU-2 carbons were activated by using KOH to improve their porosity. Galvanic charge-discharge cycles were employed to investigate electric double layer capacitor properties of the ordered mesoporous carbons in an aqueous electrolyte. Contributions to the capacitance from the surface areas of ultramicropore (d < 0.7 nm) and larger pore (d > 0.7 nm) were evaluated using a simple model. The ultramicropore surface area hardly contributes to the capacitance. On the other hand, the surface area of larger pores (d > 0.7 nm) mainly contributes to the capacitance, suggesting that the pores larger than 0.7 nm is necessary for fast diffusion of sulfate ions onto the pore surface. The ordered mesoporous carbons showed a higher capacitance compared to mesoporous carbon with a disordered structure. The high capacitance of the ordered mesoporous carbons is probably due to micropores in uniform thin pore walls and regularly-interconnected uniform mesopores.
社団法人化学工学会の論文
2011-07-01