Reevaluation of Performance of Electric Double-layer Capacitors from Constant-current Charge/Discharge and Cyclic Voltammetry

dc.contributor.authorAllagui, Anis
dc.contributor.authorFreeborn, Todd J.
dc.contributor.authorElwakil, Ahmed S.
dc.contributor.authorMaundy, Brent J.
dc.contributor.otherUniversity of Sharjah
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherEgyptian Knowledge Bank (EKB)
dc.contributor.otherNile University
dc.contributor.otherUniversity of Calgary
dc.date.accessioned2023-09-28T19:33:30Z
dc.date.available2023-09-28T19:33:30Z
dc.date.issued2016
dc.description.abstractThe electric characteristics of electric-double layer capacitors (EDLCs) are determined by their capacitance which is usually measured in the time domain from constant-current charging/discharging and cyclic voltammetry tests, and from the frequency domain using nonlinear least-squares fitting of spectral impedance. The time-voltage and current-voltage profiles from the first two techniques are commonly treated by assuming ideal SsC behavior in spite of the nonlinear response of the device, which in turn provides inaccurate values for its characteristic metrics. In this paper we revisit the calculation of capacitance, power and energy of EDLCs from the time domain constant-current step response and linear voltage waveform, under the assumption that the device behaves as an equivalent fractional-order circuit consisting of a resistance R-s in series with a constant phase element (CPE(Q, alpha), with Q being a pseudocapacitance and a a dispersion coefficient). In particular, we show with the derived (Rs, Q, alpha)-based expressions, that the corresponding nonlinear effects in voltage-time and current-voltage can be encompassed through nonlinear terms function of the coefficient alpha, which is not possible with the classical RsC model. We validate our formulae with the experimental measurements of different EDLCs.en_US
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.citationAllagui, A., Freeborn, T. J., Elwakil, A. S., & Maundy, B. J. (2016). Reevaluation of Performance of Electric Double-layer Capacitors from Constant-current Charge/Discharge and Cyclic Voltammetry. In Scientific Reports (Vol. 6, Issue 1). Springer Science and Business Media LLC. https://doi.org/10.1038/srep38568
dc.identifier.doi10.1038/srep38568
dc.identifier.orcidhttps://orcid.org/0000-0001-6044-9158
dc.identifier.orcidhttps://orcid.org/0000-0002-3972-5434
dc.identifier.orcidhttps://orcid.org/0000-0002-3924-2897
dc.identifier.orcidhttps://orcid.org/0000-0001-9979-7301
dc.identifier.urihttps://ir.ua.edu/handle/123456789/11426
dc.languageEnglish
dc.language.isoen_US
dc.publisherNature Portfolio
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCONDUCTING POLYMERS
dc.subjectSUPERCAPACITOR
dc.subjectPOWER
dc.subjectIMPEDANCE
dc.subjectCARBONS
dc.subjectMultidisciplinary Sciences
dc.titleReevaluation of Performance of Electric Double-layer Capacitors from Constant-current Charge/Discharge and Cyclic Voltammetryen_US
dc.typeArticle
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