Analysis of the Charging Current in Cyclic Voltammetry and Supercapacitor's Galvanostatic Charging Profile Based on a Constant-Phase Element
DC Field | Value | Language |
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dc.contributor.author | Yun, Changsuk | - |
dc.contributor.author | Hwang, Seongpil | - |
dc.date.accessioned | 2022-03-05T01:41:05Z | - |
dc.date.available | 2022-03-05T01:41:05Z | - |
dc.date.created | 2022-02-09 | - |
dc.date.issued | 2021-01-12 | - |
dc.identifier.issn | 2470-1343 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/137807 | - |
dc.description.abstract | We investigated the charging current in cyclic voltammetry and the galvanostatic charging/discharging behavior of a controversial constant-phase element (CPE) to describe an electrical double layer used only in electrochemical impedance spectroscopy. The linear potential sweep in the time domain was transformed into the frequency domain using a Fourier transform. The current phasor was estimated by Ohm's law with the voltage phasor and a frequency-dependent CPE, followed by an inverse Fourier transform to determine the current in the time domain. For galvanostatic charging/discharging, the same procedure, apart from swapping the voltage signal with the current signal, was applied. The obtained cyclic voltammetry (CV) shows (1) a gradual increase in the charging current, (2) a higher charging current at a low scan rate, and (3) a deviation from the linear relationship between the charging current and the scan rate. For galvanostatic charging/discharging, the results demonstrate (1) curved charging/discharging behavior, (2) a higher voltage in the early stage, and (3) a lower voltage during longer charging periods. In contrast to a previous approach based on solving a differential equation with a simple RC circuit, our Fourier transform-based approach enables an analysis of electrochemical data with an arbitrary and complex circuit model such as a Randles equivalent circuit. The CPE model is more consistent with previous experimental results than a simple ideal capacitor, indicating a ubiquitous CPE in electrochemistry and a fair figure of merit for supercapacitors. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | CAPACITANCE | - |
dc.subject | BEHAVIOR | - |
dc.subject | ELECTRODES | - |
dc.subject | ORIGIN | - |
dc.title | Analysis of the Charging Current in Cyclic Voltammetry and Supercapacitor's Galvanostatic Charging Profile Based on a Constant-Phase Element | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Hwang, Seongpil | - |
dc.identifier.doi | 10.1021/acsomega.0c04702 | - |
dc.identifier.scopusid | 2-s2.0-85099206496 | - |
dc.identifier.wosid | 000610993300035 | - |
dc.identifier.bibliographicCitation | ACS OMEGA, v.6, no.1, pp.367 - 373 | - |
dc.relation.isPartOf | ACS OMEGA | - |
dc.citation.title | ACS OMEGA | - |
dc.citation.volume | 6 | - |
dc.citation.number | 1 | - |
dc.citation.startPage | 367 | - |
dc.citation.endPage | 373 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.subject.keywordPlus | BEHAVIOR | - |
dc.subject.keywordPlus | CAPACITANCE | - |
dc.subject.keywordPlus | ELECTRODES | - |
dc.subject.keywordPlus | ORIGIN | - |
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