Superior electric double layer capacitors using ordered mesoporous carbons

This paper reports for the first time superior electric double layer capacitive properties of ordered mesoporous carbon (OMCs) with varying ordered pore symmetries and mesopore structure. Compared to commercially used activated carbon electrode, Maxsorb, these OMC carbons have superior capacitive be...

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Bibliographic Details
Published in:	Carbon (New York) 2006-02, Vol.44 (2), p.216-224
Main Authors:	Xing, W., Qiao, S.Z., Ding, R.G., Li, F., Lu, G.Q., Yan, Z.F., Cheng, H.M.
Format:	Article
Language:	eng
Subjects:	Chemistry Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Electrochemical properties Exact sciences and technology Fullerenes and related materials diamonds, graphite General and physical chemistry Materials science Physics Porous carbon Porous materials Pyrolysis Specific materials X-ray diffraction
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Summary:	This paper reports for the first time superior electric double layer capacitive properties of ordered mesoporous carbon (OMCs) with varying ordered pore symmetries and mesopore structure. Compared to commercially used activated carbon electrode, Maxsorb, these OMC carbons have superior capacitive behavior, power output and high-frequency performance in EDLCs due to the unique structure of their mesopore network, which is more favorable for fast ionic transport than the pore networks in disordered microporous carbons. As evidenced by N 2 sorption, cyclic voltammetry and frequency response measurements, OMC carbons with large mesopores, and especially with 2-D pore symmetry, show superior capacitive behaviors (exhibiting a high capacitance of over 180 F/g even at very high sweep rate of 50 mV/s, as compared to much reduced capacitance of 73 F/g for Maxsorb at the same sweep rate). OMC carbons can provide much higher power density while still maintaining good energy density. OMC carbons demonstrate excellent high-frequency performances due to its higher surface area in pores larger than 3 nm. Such ordered mesoporous carbons (OMCs) offer a great potential in EDLC capacitors, particularly for applications where high power output and good high-frequency capacitive performances are required.
ISSN:	0008-6223 1873-3891