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Article: Electrochemical capacitance and ionic transport in the mesoporous shell of a hierarchical porous core-shell carbon structure
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TitleElectrochemical capacitance and ionic transport in the mesoporous shell of a hierarchical porous core-shell carbon structure
 
AuthorsLi, F1
Morris, M1
Chan, KY1
 
KeywordsCarbon structures
Core size
Core-shell
Electrochemical capacitance
Energy density
 
Issue Date2011
 
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/Publishing/Journals/jm/index.asp
 
CitationJournal of Materials Chemistry, 2011, v. 21 n. 24, p. 8880-8886 [How to Cite?]
DOI: http://dx.doi.org/10.1039/c1jm10854a
 
AbstractA three-dimensional (3D) hierarchical porous carbon structure was prepared with possible variations in porosity at three levels of length scales. The carbon structure was template-synthesized from a core-shell silica sphere assembly. The as-synthesized carbon featured a semi-ordered porous structure with hollow macro-cores (330 nm) surrounded by a mesoporous shell containing uniform pores of 3.9 nm and distinct interstitial space between the core-shell domains. The mesoporous shell thickness was stepwise increased from 0, 25, 50 to 100 nm while keeping an identical core size to create a family of hierarchical porous structures for a systematic investigation of electrochemical capacitance and ionic transport. The shell thickness affected the overall porosity and relative porosities of the shell, core, and interstitial regions. A thicker mesoporous shell possessed a higher surface area which led to a proportional increase in electrochemical capacitance which can be fully realised at low scan rates. For the carbon structure with the maximum shell thickness of 100 nm, electrochemical capacitance per unit area and power density declined at high scan rates and high currents when ionic transport through long mesopores became limiting. The power density of the better as-synthesized porous carbon was up to 11.7 kW kg-1 when the corresponding energy density was 5.9 W h kg-1. © 2011 The Royal Society of Chemistry.
 
ISSN0959-9428
2012 SCImago Journal Rankings: 2.382
 
DOIhttp://dx.doi.org/10.1039/c1jm10854a
 
ISI Accession Number IDWOS:000291352900057
Funding AgencyGrant Number
GRF7002/09P
NSFC/GRFHKU 735/07
University of Hong Kong
Croucher Foundation
Universitas 21
Funding Information:

Financial supports from GRF 7002/09P, NSFC/GRF [HKU 735/07] and University of Hong Kong SRT on Clean Energy Research are acknowledged. The SEM and TEM were performed in the Electron Microscopy Unit of University of Hong Kong. We also thank the Department of Physics for the use of their SEM. M. Morris is visiting from the University of Edinburgh to conduct one year of full-time research. A Senior Research Fellowship from Croucher Foundation and a Universitas 21 Fellowship are acknowledged by KY Chan.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorLi, F
 
dc.contributor.authorMorris, M
 
dc.contributor.authorChan, KY
 
dc.date.accessioned2011-09-23T05:43:47Z
 
dc.date.available2011-09-23T05:43:47Z
 
dc.date.issued2011
 
dc.description.abstractA three-dimensional (3D) hierarchical porous carbon structure was prepared with possible variations in porosity at three levels of length scales. The carbon structure was template-synthesized from a core-shell silica sphere assembly. The as-synthesized carbon featured a semi-ordered porous structure with hollow macro-cores (330 nm) surrounded by a mesoporous shell containing uniform pores of 3.9 nm and distinct interstitial space between the core-shell domains. The mesoporous shell thickness was stepwise increased from 0, 25, 50 to 100 nm while keeping an identical core size to create a family of hierarchical porous structures for a systematic investigation of electrochemical capacitance and ionic transport. The shell thickness affected the overall porosity and relative porosities of the shell, core, and interstitial regions. A thicker mesoporous shell possessed a higher surface area which led to a proportional increase in electrochemical capacitance which can be fully realised at low scan rates. For the carbon structure with the maximum shell thickness of 100 nm, electrochemical capacitance per unit area and power density declined at high scan rates and high currents when ionic transport through long mesopores became limiting. The power density of the better as-synthesized porous carbon was up to 11.7 kW kg-1 when the corresponding energy density was 5.9 W h kg-1. © 2011 The Royal Society of Chemistry.
 
dc.description.naturepostprint
 
dc.identifier.citationJournal of Materials Chemistry, 2011, v. 21 n. 24, p. 8880-8886 [How to Cite?]
DOI: http://dx.doi.org/10.1039/c1jm10854a
 
dc.identifier.doihttp://dx.doi.org/10.1039/c1jm10854a
 
dc.identifier.eissn1364-5501
 
dc.identifier.epage8886
 
dc.identifier.hkuros194961
 
dc.identifier.isiWOS:000291352900057
Funding AgencyGrant Number
GRF7002/09P
NSFC/GRFHKU 735/07
University of Hong Kong
Croucher Foundation
Universitas 21
Funding Information:

Financial supports from GRF 7002/09P, NSFC/GRF [HKU 735/07] and University of Hong Kong SRT on Clean Energy Research are acknowledged. The SEM and TEM were performed in the Electron Microscopy Unit of University of Hong Kong. We also thank the Department of Physics for the use of their SEM. M. Morris is visiting from the University of Edinburgh to conduct one year of full-time research. A Senior Research Fellowship from Croucher Foundation and a Universitas 21 Fellowship are acknowledged by KY Chan.

 
dc.identifier.issn0959-9428
2012 SCImago Journal Rankings: 2.382
 
dc.identifier.issue24
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-79959258369
 
dc.identifier.spage8880
 
dc.identifier.urihttp://hdl.handle.net/10722/138992
 
dc.identifier.volume21
 
dc.languageeng
 
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/Publishing/Journals/jm/index.asp
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofJournal of Materials Chemistry
 
dc.relation.referencesReferences in Scopus
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectCarbon structures
 
dc.subjectCore size
 
dc.subjectCore-shell
 
dc.subjectElectrochemical capacitance
 
dc.subjectEnergy density
 
dc.titleElectrochemical capacitance and ionic transport in the mesoporous shell of a hierarchical porous core-shell carbon structure
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong