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Issue 40, 2017
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The ideal porous structure of EDLC carbon electrodes with extremely high capacitance

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Abstract

We propose an ideal porous structure of carbon electrodes for electric double-layer capacitors (EDLCs). The porous carbon successfully improved the gravimetric capacitance above ∼200 F g−1 even in an organic electrolyte by utilizing the carbon nanopore surface more effectively. High-resolution transmission electron microscopy images and X-ray diffraction patterns classified 15 different porous carbon electrodes into slit-shape and worm-like-shape, and the pore size distributions of the carbons were carefully determined applying the grand canonical Monte Carlo method to N2 adsorption isotherms at 77 K. The ratio of pores where solvated ions and/or desolvated ions can penetrate also has a significant effect on the EDL capacitance as well as the pore shape. The detailed study on the effect of porous morphologies on the EDLC performance indicates that a hierarchical porous structure with a worm-like shaped surface and a pore size ranging from a solvated ion to a solvent molecule is an ideal electrode structure.

Graphical abstract: The ideal porous structure of EDLC carbon electrodes with extremely high capacitance

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Publication details

The article was received on 20 Jul 2017, accepted on 16 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR05307J
Citation: Nanoscale, 2017,9, 15643-15649
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    The ideal porous structure of EDLC carbon electrodes with extremely high capacitance

    K. Urita, C. Urita, K. Fujita, K. Horio, M. Yoshida and I. Moriguchi, Nanoscale, 2017, 9, 15643
    DOI: 10.1039/C7NR05307J

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