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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
Title | Complex impedance with transmission line model and complex capacitance analysis of ion transport and accumulation in hierarchical core-shell porous carbons |
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Authors | |
Keywords | Chemistry Electrochemistry |
Issue Date | 2013 |
Publisher | Electrochemical 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/184484 |
ISSN | 2023 Impact Factor: 3.1 2023 SCImago Journal Rankings: 0.868 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Yang, C | en_US |
dc.contributor.author | Li, VCY | en_US |
dc.contributor.author | Li, F | en_US |
dc.contributor.author | Chan, KY | en_US |
dc.date.accessioned | 2013-07-15T09:49:10Z | - |
dc.date.available | 2013-07-15T09:49:10Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.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 | en_US |
dc.identifier.issn | 0013-4651 | - |
dc.identifier.uri | http://hdl.handle.net/10722/184484 | - |
dc.description.abstract | The 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.language | eng | en_US |
dc.publisher | Electrochemical Society, Inc. The Journal's web site is located at http://ojps.aip.org/JES | - |
dc.relation.ispartof | Journal of The Electrochemical Society | en_US |
dc.rights | Journal of The Electrochemical Society. Copyright © Electrochemical Society, Inc. | - |
dc.subject | Chemistry | - |
dc.subject | Electrochemistry | - |
dc.title | Complex impedance with transmission line model and complex capacitance analysis of ion transport and accumulation in hierarchical core-shell porous carbons | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Li, VCY: cyvli@hku.hk | en_US |
dc.identifier.email | Li, F: hubfujun@hku.hk | en_US |
dc.identifier.email | Chan, KY: hrsccky@hku.hk | - |
dc.identifier.authority | Chan, KY=rp00662 | en_US |
dc.identifier.doi | 10.1149/2.016306jes | - |
dc.identifier.scopus | eid_2-s2.0-84875709792 | - |
dc.identifier.hkuros | 216453 | en_US |
dc.identifier.volume | 160 | en_US |
dc.identifier.issue | 4 | en_US |
dc.identifier.spage | H271 | en_US |
dc.identifier.epage | H278 | en_US |
dc.identifier.isi | WOS:000316976800098 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0013-4651 | - |