Double-layer capacitance of waste coffee ground activated carbons in an organic electrolyte

Thomas Rufford, D. Hulicova-Jurcakova, E. Fiset, Z.H. Zhu, G.Q. Lu

    Research output: Contribution to journalArticle

    118 Citations (Scopus)

    Abstract

    Using ZnCl2 activation we prepared a series of carbon electrodes from waste coffee grounds to study the effect of mesopores on double-layer capacitance in a tetraethyl ammonium tetrafluoroborate/acetonitrile electrolyte. The activated carbon with the largest mesopore volume achieved an energy density of 34 Wh kg(-1) at low current loads, and significantly retained an energy density of 16.5 Wh kg(-1) and specific capacitance of more than 100 F g(-1) at fast charge-discharge rates (20 A g(-1)). The effect of mesopores on capacitance at fast charge-discharge rates is discussed. (C) 2009 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)974-977
    JournalElectrochemistry Communications
    Volume11
    Issue number5
    DOIs
    Publication statusPublished - 2009

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