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Issue 18, 2011
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Rice grain-shaped TiO2 mesostructures—synthesis, characterization and applications in dye-sensitized solar cells and photocatalysis

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Abstract

We report the synthesis, characterization and applications in dye-sensitized solar cells and photocatalysis of novel “rice grain-shaped” TiO2 mesostructures by electrospinning, which is a well-established and cost-effective technique for large-scale production of 1-D nanostructures. The porous and crystalline rice grain-like structures produced at 500 °C are uniformly distributed with a high surface area of ∼60 m2 g−1 and with mixed crystal structure. The origin of the unique morphology is traced to the microscale phase separation between TiO2 and the polymer during solvent evaporation owing to the solubility difference between the two. The morphology is excellently reproducible over a wide range of concentrations of the precursors and spinning conditions. Evolution of the unique morphology from fiber structures is probed by scanning electron microscopy analyses of systematically heated electrospun fibers. The rice grain morphology is stable up to 600 °C and with further increase in temperature, the shape distorts with accompanying changes to the anatase–rutile proportion and complete dominance of the rutile phase at 1000 °C. A comparison of the photovoltaic and photocatalytic performance of the material with P-25 TiO2 showed that the rice grain-shaped structures are superior to commercially available P-25. We anticipate that the material would have wide range of applications in other areas too such as photonic crystals, chemical sensors, self-cleaning materials, UV-blockers, etc.

Graphical abstract: Rice grain-shaped TiO2 mesostructures—synthesis, characterization and applications in dye-sensitized solar cells and photocatalysis

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Article information


Submitted
24 Dec 2010
Accepted
16 Feb 2011
First published
14 Mar 2011

J. Mater. Chem., 2011,21, 6541-6548
Article type
Paper

Rice grain-shaped TiO2 mesostructures—synthesis, characterization and applications in dye-sensitized solar cells and photocatalysis

Y. Shengyuan, Z. Peining, A. S. Nair and S. Ramakrishna, J. Mater. Chem., 2011, 21, 6541
DOI: 10.1039/C0JM04512H

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