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Article: Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber

TitleEnhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber
Authors
Issue Date2008
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/
Citation
Journal Of Physical Chemistry C, 2008, v. 112 n. 51, p. 20539-20545 How to Cite?
AbstractA bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials. © 2008 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/58357
ISSN
2015 Impact Factor: 4.509
2015 SCImago Journal Rankings: 1.995
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Wen_HK
dc.contributor.authorLiu, Cen_HK
dc.contributor.authorZhou, Yen_HK
dc.contributor.authorBai, Yen_HK
dc.contributor.authorFeng, Xen_HK
dc.contributor.authorYang, Zen_HK
dc.contributor.authorLu, Len_HK
dc.contributor.authorLu, Xen_HK
dc.contributor.authorChan, KYen_HK
dc.date.accessioned2010-05-31T03:28:54Z-
dc.date.available2010-05-31T03:28:54Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Physical Chemistry C, 2008, v. 112 n. 51, p. 20539-20545en_HK
dc.identifier.issn1932-7447en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58357-
dc.description.abstractA bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials. © 2008 American Chemical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/journals/jpccck/en_HK
dc.relation.ispartofJournal of Physical Chemistry Cen_HK
dc.titleEnhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiberen_HK
dc.typeArticleen_HK
dc.identifier.emailChan, KY:hrsccky@hku.hken_HK
dc.identifier.authorityChan, KY=rp00662en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/jp808183qen_HK
dc.identifier.scopuseid_2-s2.0-61349100745en_HK
dc.identifier.hkuros162405en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-61349100745&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume112en_HK
dc.identifier.issue51en_HK
dc.identifier.spage20539en_HK
dc.identifier.epage20545en_HK
dc.identifier.isiWOS:000261835000065-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, W=15073077300en_HK
dc.identifier.scopusauthoridLiu, C=36063391100en_HK
dc.identifier.scopusauthoridZhou, Y=23029416000en_HK
dc.identifier.scopusauthoridBai, Y=26643355600en_HK
dc.identifier.scopusauthoridFeng, X=34769676900en_HK
dc.identifier.scopusauthoridYang, Z=7405433667en_HK
dc.identifier.scopusauthoridLu, L=22835882200en_HK
dc.identifier.scopusauthoridLu, X=7404839077en_HK
dc.identifier.scopusauthoridChan, KY=7406034142en_HK

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