Öztürk, Asiye

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A.,Öztürk
O.,Asiye
Asiye, Ozturk
Ozturk,A.
A.,Ozturk
Ö.,Asiye
Öztürk,A.
Asiye, Öztürk
O., Asiye
Öztürk, Asiye
Ozturk, Asiye
A., Ozturk
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Öğretim Görevlisi
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asiye.ozturk@atilim.edu.tr
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Scholarly Output

3

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1

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2013 - 20153
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Now showing 1 - 3 of 3
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    Influence of particle size of TiO2 powder on the energy conversion efficiency of a dye-sensitized solar cell
    (2013) Park, Jongee; Park,J.; Öztürk, Asiye; Metallurgical and Materials Engineering; English Translation and Interpretation
    Dye-sensitized solar cells (DSSCs) have been fabricated using a TiO2 paste composed of mixtures of 25 nm and 250 nm TiO2 particles at various ratios. A maximum energy conversion efficiency of 6.7% has been achieved using the DSSC, based on a TiO2 layer composed of 40 wt% 25 nm and 60 wt% 250 nm TiO2 particles. The short-circuit current density, open-circuit voltage, and filling factor of the cell were 12.95 mA, 0.82 V, and 0.63, respectively. The overall performance of the DSSCs based on TiO2 layers composed using a mixture of two different sized particles is much better than that of either only 25 nm or only 250 nm TiO2 particles. It is recognized that adding the larger particles to the small particles in the TiO2 paste increases the dye absorption and light scattering effects of DSSC, resulting in a higher short-circuit current density and improved energy conversion efficiency. © (2013) Trans Tech Publications, Switzerland.
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    Production of highly efficient photocatalytic TiO2 powders by mechanical ball milling
    (2013) Park, Jongee; Park,J.; Öztürk, Asiye; Metallurgical and Materials Engineering; English Translation and Interpretation
    Highly efficient photocatalytic TiO2 powders were prepared using a conventional ball mill with various milling times of 0, 12, 24 and 48 h. The photocatalytic activity of the prepared TiO2 powders was evaluated using the decomposition rate obtained by methylene blue (MB) solution and acetic acid gas under UV light irritation. After 24 h milling, the particle size decreased from 555 nm to 122 nm without changing any of the crystal structure. The photocatalytic TiO2 powders prepared by 24 h milling decomposed 94% of the methylene blue solution while the nonmilled TiO2 powders provided only 61% decomposition. After the removal of acetic acid gas, it took 1.5 h for the 24h-milled powders to decompose 100%, while the non-milled TiO2 showed 73% decomposition with same UV illumination duration. © (2013) Trans Tech Publications, Switzerland.
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    Synthesis of TiO2 nanostructures via hydrothermal method
    (American Ceramic Society, 2015) Park, Jongee; Agartan,L.; Öztürk, Asiye; Ozturk,A.; Metallurgical and Materials Engineering; English Translation and Interpretation
    Titania (TiO2) nanostructures were produced via hydrothermal method using amorphous TiO2 powders synthesized by the sol-gel precipitation process. The hydrothermal system was isolated from the environment and hydrothermal reactions were allowed to execute at 130 °C for 36 h at autogeneous pressure, and at a stirring rate of 250 rpm. Scanning electron microscopy (SEM) analysis revealed that TiO2 nanofibers formed instead of nanotubes upon utilization of amorphous TiO2 precursor. After hydrothermal synthesis, the powders were acid treated by HCl several times. X-ray diffraction (XRD) analysis identified that the synthesized powders were Na-titanate and remained Na-titanate even after subjecting to acidic treatments several times. The photocatalytic performance of the powders was evaluated by degradation of methylene blue (MB) solution in UV illumination. Results were compared with nanotubes which were synthesized previously using P25 commercial titania powder and have shown that TiO2 in tubular structure offers better photocatalytic performance for the degradation of MB solution under UV illumination as compared to fiber-like structure. Copyright © 2015 by The American Ceramic Society. All rights reserved.