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Article: Electrochemical capacitance and ionic transport in the mesoporous shell of a hierarchical porous core-shell carbon structure

TitleElectrochemical capacitance and ionic transport in the mesoporous shell of a hierarchical porous core-shell carbon structure
Authors
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
Citation
Journal of Materials Chemistry, 2011, v. 21 n. 24, p. 8880-8886 How to Cite?
Abstract
A 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.
Persistent Identifierhttp://hdl.handle.net/10722/138992
ISSN
2013 Impact Factor: 6.626
ISI Accession Number ID
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.

References

 

Author Affiliations
  1. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorLi, Fen_HK
dc.contributor.authorMorris, Men_HK
dc.contributor.authorChan, KYen_HK
dc.date.accessioned2011-09-23T05:43:47Z-
dc.date.available2011-09-23T05:43:47Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal of Materials Chemistry, 2011, v. 21 n. 24, p. 8880-8886en_HK
dc.identifier.issn0959-9428en_HK
dc.identifier.urihttp://hdl.handle.net/10722/138992-
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.en_HK
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/Publishing/Journals/jm/index.aspen_HK
dc.relation.ispartofJournal of Materials Chemistryen_HK
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 structureen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0959-9428&volume=21&issue=24&spage=8880&epage=8886&date=2011&atitle=Electrochemical+capacitance+and+ionic+transport+in+the+mesoporous+shell+of+a+hierarchical+porous+core-shell+carbon+structure-
dc.identifier.emailChan, KY:hrsccky@hku.hken_HK
dc.identifier.authorityChan, KY=rp00662en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1039/c1jm10854aen_HK
dc.identifier.scopuseid_2-s2.0-79959258369en_HK
dc.identifier.hkuros194961en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959258369&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume21en_HK
dc.identifier.issue24en_HK
dc.identifier.spage8880en_HK
dc.identifier.epage8886en_HK
dc.identifier.eissn1364-5501-
dc.identifier.isiWOS:000291352900057-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, F=35620639500en_HK
dc.identifier.scopusauthoridMorris, M=42161972200en_HK
dc.identifier.scopusauthoridChan, KY=7406034142en_HK

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