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Mechanism of ultrafast supercapacitors

Abstract

While microporous carbon is considered as the prime candidate for the energy storage application of supercapacitors, graphene is usually used for AC line-filtering capacitors. Surprisingly, the rate capability of the latter is a few orders of magnitude higher than the former. The interesting point is that such ultrafast performance can be achieved when the graphene sheets are vertically aligned, as the rate capability of ordinary graphene electrodes is similar to that of microporous supercapacitors. Understanding the actual role of the graphene alignment can shed light on the underlying mechanism to design faster supercapacitors for the energy storage purpose too. It is discussed that the classic double layer models cannot explain the critical importance of the graphene orientation. By reviewing the experimental evidence reported in the literature, the possibility of a different mechanism is justified. Furthermore, the impedance model of supercapacitors, which can be a guiding star in this direction, is explained from a practical perspective.

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Publication details

The article was received on 13 Nov 2017, accepted on 03 Jan 2018 and first published on 03 Jan 2018


Article type: Review Article
DOI: 10.1039/C7TA10013B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Mechanism of ultrafast supercapacitors

    A. Eftekhari, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10013B

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