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Issue 14, 2008
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Preparation of three dimensionally ordered macroporous carbon with mesoporous walls for electric double-layer capacitors

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Abstract

Three dimensionally ordered macroporous (3DOM) carbons with mesoporous walls were prepared by a colloidal crystal templating method. A three dimensionally ordered composite consisting of monodisperse polystyrene (PS) latex (100–450 nm) and colloidal silica (5–50 nm) was prepared by an evaporation process of suspensions containing PS latex and colloidal silica in water. In the course of the heat treatment of this composite membrane at 573 K under an inert atmosphere, the PS was melted and penetrated into the spaces between the colloidal silica. The penetrated PS was carbonized during further heat treatment to provide a very thin carbon layer on the colloidal silica, and the macropore corresponding to the PS particle size was formed simultaneously. After this procedure, the 3DOM carbon with mesoporous walls was obtained by removing the silica particles. From the results of scanning electron microscope observations and nitrogen adsorption-desorption measurements, it was confirmed that the prepared carbon had a bimodal porous structure, and the sizes of macropores and mesopores of prepared carbon were in good agreement with the sizes of the PS and silica particles used as templates, respectively. The bimodal porous carbon, which had a specific surface area of 1500 m2 g−1 and 5 nm mesopores, showed highest capacitance of 120 F g−1 in propylene carbonate solution containing 1 mol dm−3 (C2H5)4NBF4. The mesopore size rather than macropore size gave significant effects on the rate capability of carbon electrode during charge and discharge. The bimodal porous carbon having 5 nm mesopores showed an excellent rate capability and its capacitance at a high current density of 4 A g−1 was 109 F g−1.

Graphical abstract: Preparation of three dimensionally ordered macroporous carbon with mesoporous walls for electric double-layer capacitors

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Publication details

The article was received on 20 Nov 2007, accepted on 24 Jan 2008 and first published on 20 Feb 2008


Article type: Paper
DOI: 10.1039/B717996K
Citation: J. Mater. Chem., 2008,18, 1674-1680
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    Preparation of three dimensionally ordered macroporous carbon with mesoporous walls for electric double-layer capacitors

    S. Woo, K. Dokko, H. Nakano and K. Kanamura, J. Mater. Chem., 2008, 18, 1674
    DOI: 10.1039/B717996K

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