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Article: Carbon titania mesoporous composite whisker as stable supercapacitor electrode material
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TitleCarbon titania mesoporous composite whisker as stable supercapacitor electrode material
 
AuthorsLu, L1 2
Zhu, Y1
Li, F2
Zhuang, W1
Chan, KY2
Lu, X1
 
Issue Date2010
 
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, 2010, v. 20 n. 36, p. 7645-7651 [How to Cite?]
DOI: http://dx.doi.org/10.1039/c0jm00054j
 
AbstractTitania carbon composites were prepared via in situ carbonization on mesoporous titania whiskers. Their microstructures were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), showing that the composites, after carbonization, still retain the original morphology of the whiskers and the crystalline structure of titania. Based on N 2 sorption isotherms, the average pore sizes of the as-prepared composites were found to depend on the amount of filled carbon. The electrochemical capacitance performance of the as-prepared composites was investigated by cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge cycles. Although the specific surface area of the composite TiO 2/0.252C is moderate at 156 m 2 g -1, its specific volumetric capacitance of 25 F cm -3 was much higher than the value of 10 F cm -3 for Vulcan XC-72, which has a specific surface area of 236 m 2 g -1. This enhanced capacitance may come from the composite mesopores derived from porous titania whiskers. They provide readily accessible diffusion pathways for electrolyte ions. There is better conductivity with carbon in the composite. After 2000 cycles, we observed a change of -2.8%, -2.6% and -1.9% decrease in the specific volumetric capacitance compared to the values at the 100th cycle of the composites TiO 2/0.252C, TiO 2/0.143C and TiO 2/0.08C, respectively. This decrease is small and significantly less than the 10% decrease of capacitance in Vulcan XC-72 in the same period. The more consistent capacitance in the composite suggests a more stable interface between titania, carbon filling and electrolyte compared to that of Vulcan XC-72 without titania. © 2010 The Royal Society of Chemistry.
 
ISSN0959-9428
2012 SCImago Journal Rankings: 2.382
 
DOIhttp://dx.doi.org/10.1039/c0jm00054j
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorLu, L
 
dc.contributor.authorZhu, Y
 
dc.contributor.authorLi, F
 
dc.contributor.authorZhuang, W
 
dc.contributor.authorChan, KY
 
dc.contributor.authorLu, X
 
dc.date.accessioned2012-10-08T03:19:29Z
 
dc.date.available2012-10-08T03:19:29Z
 
dc.date.issued2010
 
dc.description.abstractTitania carbon composites were prepared via in situ carbonization on mesoporous titania whiskers. Their microstructures were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), showing that the composites, after carbonization, still retain the original morphology of the whiskers and the crystalline structure of titania. Based on N 2 sorption isotherms, the average pore sizes of the as-prepared composites were found to depend on the amount of filled carbon. The electrochemical capacitance performance of the as-prepared composites was investigated by cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge cycles. Although the specific surface area of the composite TiO 2/0.252C is moderate at 156 m 2 g -1, its specific volumetric capacitance of 25 F cm -3 was much higher than the value of 10 F cm -3 for Vulcan XC-72, which has a specific surface area of 236 m 2 g -1. This enhanced capacitance may come from the composite mesopores derived from porous titania whiskers. They provide readily accessible diffusion pathways for electrolyte ions. There is better conductivity with carbon in the composite. After 2000 cycles, we observed a change of -2.8%, -2.6% and -1.9% decrease in the specific volumetric capacitance compared to the values at the 100th cycle of the composites TiO 2/0.252C, TiO 2/0.143C and TiO 2/0.08C, respectively. This decrease is small and significantly less than the 10% decrease of capacitance in Vulcan XC-72 in the same period. The more consistent capacitance in the composite suggests a more stable interface between titania, carbon filling and electrolyte compared to that of Vulcan XC-72 without titania. © 2010 The Royal Society of Chemistry.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationJournal Of Materials Chemistry, 2010, v. 20 n. 36, p. 7645-7651 [How to Cite?]
DOI: http://dx.doi.org/10.1039/c0jm00054j
 
dc.identifier.doihttp://dx.doi.org/10.1039/c0jm00054j
 
dc.identifier.epage7651
 
dc.identifier.hkuros180138
 
dc.identifier.issn0959-9428
2012 SCImago Journal Rankings: 2.382
 
dc.identifier.issue36
 
dc.identifier.scopuseid_2-s2.0-78149443744
 
dc.identifier.spage7645
 
dc.identifier.urihttp://hdl.handle.net/10722/168485
 
dc.identifier.volume20
 
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.titleCarbon titania mesoporous composite whisker as stable supercapacitor electrode material
 
dc.typeArticle
 
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<contributor.author>Zhu, Y</contributor.author>
<contributor.author>Li, F</contributor.author>
<contributor.author>Zhuang, W</contributor.author>
<contributor.author>Chan, KY</contributor.author>
<contributor.author>Lu, X</contributor.author>
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Author Affiliations
  1. Nanjing University of Technology
  2. The University of Hong Kong