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Photocatalytic Comparison of TiO2 Nanoparticles and Electrospun TiO2 Nanofibers: Effects of Mesoporosity and Interparticle Charge Transfer

Title
Photocatalytic Comparison of TiO2 Nanoparticles and Electrospun TiO2 Nanofibers: Effects of Mesoporosity and Interparticle Charge Transfer
Authors
Choi, Sung KyuKim, Soon HyunLim, Sang KyooPark, Hyunwoong
DGIST Authors
Kim, Soon HyunLim, Sang Kyoo
Issue Date
2010-10
Citation
Journal of Physical Chemistry C, 114(39), 16475-16480
Type
Article
Article Type
Article
Keywords
Application FieldsCalcinationCharge SeparationsCharge TransferElectrospunsHigh EfficiencyHigh Surface Area MesoporousHydrogen ProductionIon ExchangeMass TransferMeso-PoresMesoporosityNanoarchitecturesNanofibersNanoparticlesPhoto-CatalyticPhoto-Catalytic ActivitiesPhotocurrent GenerationsSolar LightSpherical NanoparticlesSurface CharacterizationTiOTO Effect
ISSN
1932-7447
Abstract
The development of a high-efficiency TiO2 photocatalyst is of great importance to a variety of solar light conversion and application fields; the desired high efficiency can be achieved by employing well-controlled TiO2 nanoarchitectures. In this study, we have successfully synthesized well-ordered and aligned high surface area mesoporous TiO 2 nanofibers (TiO2-NF) by electrospinning of TiO 2 powder dispersed in viscous polymer solution and subsequent calcination. For comparison, TiO2 nanoparticles (TiO2-NP) are also prepared from calcination of the same TiO2 powder. The TiO2-NF of ca. 500 nm in diameter and a few micrometers in length consist of compactly and densely packed spherical nanoparticles of ca. 20 nm in size and have mesopores of 3-4 nm in radius. Photocatalytic comparison between TiO2-NF and TiO2-NP indicated that the former had far higher photocatalytic activities in photocurrent generation by a factor of 3 and higher hydrogen production by a factor of 7. The photocatalytic superiority of TiO2-NF is attributed to effects of mesoporosity and nanoparticle alignment, which could cause efficient charge separation through interparticle charge transfer along the nanofiber framework. Finally, various surface characterization experiments were conducted and included to understand the photocatalytic behaviors of TiO2-NF and TiO2-NP. © 2010 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/5404
DOI
10.1021/jp104317x
Publisher
American Chemical Society
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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