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Conference Paper: Complex impedance with transmission line model and complex capacitance analysis of ion transport and accumulation in hierarchical core-shell porous carbons

TitleComplex impedance with transmission line model and complex capacitance analysis of ion transport and accumulation in hierarchical core-shell porous carbons
Authors
KeywordsChemistry
Electrochemistry
Issue Date2013
PublisherElectrochemical Society, Inc. The Journal's web site is located at http://ojps.aip.org/JES
Citation
The 221st Meeting of the Electrochemical Society, Seattle, WA., 6-10 May 2012. In Journal of The Electrochemical Society, 2013, v. 160 n. 4, p. H271-H278, Paper no. 1590 How to Cite?
AbstractThe transmission line model (TLM) and complex capacitance analysis were applied to study the electrochemical capacitive performance and ion transport behaviors in 3D hierarchical carbon networks with hollow core and mesoporous shell (HCMS) structure. The shell thickness (S) was stepwise increased from S = 0 to 100 nm while the diameters of hollow core and mesopores were kept constant. The electrochemical impedance spectra (EIS) were fitted with a 5-level transmission line model (TLM). TLM demonstrated that major capacitance was contributed from the second to the fourth level, which can be associated to the mesoporous shell region in the HCMS texture. Complex capacitance analysis provides additional information, particularly in the low frequency range. The relaxation time constants determined from the peak frequency of the imaginary part C′′(ω) increase with S but are larger than the values determined by TLM analysis. Decomposition of complex power into active and reactive components reveals dependence on frequency and shell thickness. These results revealed that the HCMS carbons with thicker shells can provide larger specific capacitance but lower rate capability. The mesoporous shell thickness in the HCMS carbons can be tuned to fulfill separate demands of energy and power for advanced electrochemical capacitors.
Persistent Identifierhttp://hdl.handle.net/10722/184484
ISSN
2015 Impact Factor: 3.014
2015 SCImago Journal Rankings: 1.157
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYang, Cen_US
dc.contributor.authorLi, VCYen_US
dc.contributor.authorLi, Fen_US
dc.contributor.authorChan, KYen_US
dc.date.accessioned2013-07-15T09:49:10Z-
dc.date.available2013-07-15T09:49:10Z-
dc.date.issued2013en_US
dc.identifier.citationThe 221st Meeting of the Electrochemical Society, Seattle, WA., 6-10 May 2012. In Journal of The Electrochemical Society, 2013, v. 160 n. 4, p. H271-H278, Paper no. 1590en_US
dc.identifier.issn0013-4651-
dc.identifier.urihttp://hdl.handle.net/10722/184484-
dc.description.abstractThe transmission line model (TLM) and complex capacitance analysis were applied to study the electrochemical capacitive performance and ion transport behaviors in 3D hierarchical carbon networks with hollow core and mesoporous shell (HCMS) structure. The shell thickness (S) was stepwise increased from S = 0 to 100 nm while the diameters of hollow core and mesopores were kept constant. The electrochemical impedance spectra (EIS) were fitted with a 5-level transmission line model (TLM). TLM demonstrated that major capacitance was contributed from the second to the fourth level, which can be associated to the mesoporous shell region in the HCMS texture. Complex capacitance analysis provides additional information, particularly in the low frequency range. The relaxation time constants determined from the peak frequency of the imaginary part C′′(ω) increase with S but are larger than the values determined by TLM analysis. Decomposition of complex power into active and reactive components reveals dependence on frequency and shell thickness. These results revealed that the HCMS carbons with thicker shells can provide larger specific capacitance but lower rate capability. The mesoporous shell thickness in the HCMS carbons can be tuned to fulfill separate demands of energy and power for advanced electrochemical capacitors.-
dc.languageengen_US
dc.publisherElectrochemical Society, Inc. The Journal's web site is located at http://ojps.aip.org/JES-
dc.relation.ispartofJournal of The Electrochemical Societyen_US
dc.rightsJournal of The Electrochemical Society. Copyright © Electrochemical Society, Inc.-
dc.subjectChemistry-
dc.subjectElectrochemistry-
dc.titleComplex impedance with transmission line model and complex capacitance analysis of ion transport and accumulation in hierarchical core-shell porous carbonsen_US
dc.typeConference_Paperen_US
dc.identifier.emailLi, VCY: cyvli@hku.hken_US
dc.identifier.emailLi, F: hubfujun@hku.hken_US
dc.identifier.emailChan, KY: hrsccky@hku.hk-
dc.identifier.authorityChan, KY=rp00662en_US
dc.identifier.doi10.1149/2.016306jes-
dc.identifier.scopuseid_2-s2.0-84875709792-
dc.identifier.hkuros216453en_US
dc.identifier.volume160en_US
dc.identifier.issue4en_US
dc.identifier.spageH271en_US
dc.identifier.epageH278en_US
dc.identifier.isiWOS:000316976800098-
dc.publisher.placeUnited States-

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