NDLI: Novel hollow mesoporous 1D TiO<sub>2</sub> nanofibers as photovoltaic and photocatalytic materials

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Nanoscale Vol - 4 Issue - 4

Nanoscale Vol - 4 Issue - 3

Nanoscale Vol -3

Nanoscale Vol -2

Nanoscale Vol -1

Novel hollow mesoporous 1D TiO₂ nanofibers as photovoltaic and photocatalytic materials

Content Provider	Royal Society of Chemistry (RSC)
Author	Thavasi, Velmurugan Mhaisalkar, S G Zhang, Xiang Ramakrishna, Seeram
Copyright Year	2012
Abstract	Hollow mesoporous one dimensional (1D) TiO2 nanofibers are successfully prepared by co-axial electrospinning of a titanium tetraisopropoxide (TTIP) solution with two immiscible polymers; polyethylene oxide (PEO) and polyvinylpyrrolidone (PVP) using a core–shell spinneret, followed by annealing at 450 °C. The annealed mesoporous TiO2 nanofibers are found to having a hollow structure with an average diameter of 130 nm. Measurements using the Brunauer–Emmett–Teller (BET) method reveal that hollow mesoporous TiO2 nanofibers possess a high surface area of 118 m2 g−1 with two types of mesopores; 3.2 nm and 5.4 nm that resulted from gaseous removal of PEO and PVP respectively during annealing. With hollow mesoporous TiO2 nanofibers as the photoelectrode in dye sensitized solar cells (DSSC), the solar-to-current conversion efficiency (η) and short circuit current (Jsc) are measured as 5.6% and 10.38 mA cm−2 respectively, which are higher than those of DSSC made using regular TiO2 nanofibers under identical conditions (η = 4.2%, Jsc = 8.99 mA cm−2). The improvement in the conversion efficiency is mainly attributed to the higher surface area and mesoporous TiO2 nanostructure. It facilitates the adsorption of more dye molecules and also promotes the incident photon to electron conversion. Hollow mesoporous TiO2 nanofibers with close packing of grains and crystals intergrown with each other demonstrate faster electron diffusion, and longer electron recombination time than regular TiO2 nanofibers as well as P25 nanoparticles. The surface effect of hollow mesoporous TiO2 nanofibers as a photocatalyst for the degradation of rhodamine dye was also investigated. The kinetic study shows that the hollow mesoporous surface of the TiO2 nanofibers influenced its interactions with the dye, and resulted in an increased catalytic activity over P25 TiO2 nanocatalysts.
Starting Page	1707
Ending Page	1716
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	4
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c2nr11251e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Rhodamine Spinneret (polymers) Photocatalysis Carrier generation and recombination Electrospinning Polyvinylpyrrolidone Nanostructure PVP Photon Emmett Mesoporous material Dye Short circuit Adsorption Polyethylene glycol Titanium Jsc Diffusion DSSC Nucleic acid thermodynamics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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