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Article: Carbon titania mesoporous composite whisker as stable supercapacitor electrode material

TitleCarbon titania mesoporous composite whisker as stable supercapacitor electrode material
Authors
Issue Date2010
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, 2010, v. 20 n. 36, p. 7645-7651 How to Cite?
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.
Persistent Identifierhttp://hdl.handle.net/10722/168485
ISSN
2013 Impact Factor: 6.626
2014 SCImago Journal Rankings: 2.264
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLu, Len_US
dc.contributor.authorZhu, Yen_US
dc.contributor.authorLi, Fen_US
dc.contributor.authorZhuang, Wen_US
dc.contributor.authorChan, KYen_US
dc.contributor.authorLu, Xen_US
dc.date.accessioned2012-10-08T03:19:29Z-
dc.date.available2012-10-08T03:19:29Z-
dc.date.issued2010en_US
dc.identifier.citationJournal Of Materials Chemistry, 2010, v. 20 n. 36, p. 7645-7651en_US
dc.identifier.issn0959-9428en_US
dc.identifier.urihttp://hdl.handle.net/10722/168485-
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.en_US
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_US
dc.relation.ispartofJournal of Materials Chemistryen_US
dc.titleCarbon titania mesoporous composite whisker as stable supercapacitor electrode materialen_US
dc.typeArticleen_US
dc.identifier.emailChan, KY:hrsccky@hku.hken_US
dc.identifier.authorityChan, KY=rp00662en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/c0jm00054jen_US
dc.identifier.scopuseid_2-s2.0-78149443744en_US
dc.identifier.hkuros180138-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78149443744&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume20en_US
dc.identifier.issue36en_US
dc.identifier.spage7645en_US
dc.identifier.epage7651en_US
dc.identifier.isiWOS:000281411000009-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLu, L=22835882200en_US
dc.identifier.scopusauthoridZhu, Y=22982530700en_US
dc.identifier.scopusauthoridLi, F=35620639500en_US
dc.identifier.scopusauthoridZhuang, W=36247766100en_US
dc.identifier.scopusauthoridChan, KY=7406034142en_US
dc.identifier.scopusauthoridLu, X=7404839077en_US

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