Surface Modification of TiO<sub>2</sub>Nanoparticles with Phenyltrimethoxysilane in Dye-sensitized Solar Cells

Chang, Yong‐June; Kum, Byung-Gon; Park, Yoon-Cheol; Kong, Eui-Hyun; Jang, Hyun M.

doi:10.5012/bkcs.2014.35.2.415

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…In contrast, the porphyrin-doped TiO2 sample spectra exhibit broad peaks at around -58 ppm and-68 ppm. The peak at -58 ppm corresponds to a T 2 configuration silicon site [RSi(OEt)1(OTi)2] [76] whereas the peak at -68 ppm corresponds to a completely condensed T 3 configuration [RSi(OTi)3] [76,77]. The broadness of the chemical shifts indicates that the silicon is amorphous.…”

Section: Solid State Nmr Studiesmentioning

confidence: 99%

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Mahy

Páez

Carcel

et al. 2019

Journal of Photochemistry and Photobiology A: Chemistry

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A silylated porphyrin derivative is co-hydrolyzed with Ti(OiPr)4 to produce a hybrid TiO2 photocatalyst, and three different ratios between porphyrin and TiO2 are made. In this way, the porphyrin fragments are held in the resulting matrix through strong Si-O-Ti covalent bonds to limit porphyrin leaching. Thanks to its photoactive character the porphyrin fragment can act as an actuator for the TiO2 to degrade organic pollutants using light from ultra-violet to the visible range. The photocatalysts are synthesized using an easy aqueous route allowing "green conditions" for synthesis. For comparative purposes, the corresponding pure TiO2 and a grafted catalyst are also synthesized and studied. For all samples, a mixture of anatase/brookite TiO2 is obtained, resulting in crystalline materials with low temperature synthesis. The three porphyrin-doped samples prepared in water prove to be efficient photocatalysts for the degradation of p-nitrophenol (PNP) under visible light, and an improvement in photoactivity is observed when the amount of porphyrin increases. The photocatalyst activity is very stable over time as the PNP degradation remains nearly constant after 264 h of testing, showing no leaching of porphyrin. In recycling tests, the grafted sample presents bond breaking between POR-Si and TiO2 and a decrease in photoactivity towards pure TiO2 sample activity. A comparison with the commercial Evonik P25 catalyst shows that the porphyrin-doped TiO2 is nearly 6 times more photoactive under visible light for PNP degradation.

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Section: Solid State Nmr Studiesmentioning

confidence: 99%

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Mahy

Páez

Carcel

et al. 2019

Journal of Photochemistry and Photobiology A: Chemistry

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“…The efficiency and stability of these cells can be affected by various factors like light absorption by the dye, porosity of the TiO2 film, surface area of the nano-particles, electron transport and so on. Controlling these parameters can be obtained by various ways such as using different dyes [3][4][5][6][7][8][9][10][11][12][13][14][15], semiconductors with different band gaps or morphology [16] or electrolytes [17][18][19]. Although the performance of natural dyes yields lower efficiency than synthetic dyes, its benefits as low cost, ease of manufacturing, environmentally safeness, and abundance, encouraged researchers to focus on the improvement of its efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dyes Extracted from Safflower, Medicago Sativa, and Ros Marinus Oficinalis as Photosensitizers for Dye-sensitized Solar Cells

Taya

El-Agez²,

Abdel-Latif³

et al. 2016

J. Nano- Electron. Phys.

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In this work, three extracts of plant leaves were used as sensitizers for dye-sensitized solar cells (DSSCs). These plants are Safflower, Medicago sativa and Ros marinus oficinalis. The natural dyes were extracted before and after grinding the plant leaves. The UV-VIS absorption spectra of the three extracts in ethyl alcohol solution were measured. The DSSCs were assembled using TiO2 films on Fluorine-doped tin oxide (FTO) coated glass. The DSSCs sensitized with the extracts of grinded leaves showed a better performance compared to those sensitized with un-grinded leaves with the highest efficiency of 0.115 % was obtained for the DSSC sensitized with Medicago sativa. The performance of the DSSCs sensitized with Safflower and Ros marinus oficinalis was significantly improved by acid treatment of the FTO substrates. Impedance spectroscopy of the fabricated cells was also carried out.

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“…HCHO photodegradation in the presence of a titanium dioxide (TiO 2 ) photocatalyst completely degrades HCHO into CO 2 and H 2 O [ 2 ]. Unfortunately, the photocatalytic activity of TiO 2 is limited by its low adsorption property and large band gap (3.2 eV) [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis of Carbon-Based (N, Fe)-Codoped TiO2 for the Photocatalytic Degradation of Formaldehyde

Tian¹,

Wu²,

Tong³

et al. 2015

Nanoscale Res Lett

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A microwave-assisted sol–gel method was used to synthesize (N, Fe)-codoped activated carbon (AC)/TiO2 photocatalyst for enhanced optical absorption in the visible light region. The prepared samples were characterized via X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller analysis, ultraviolet–visible light spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The results showed no significant difference in the surface area of AC/TiO2 (approximately 500 m2/g) after doping. TiO2 was uniformly distributed on the surface of AC, which exhibited coexisting anatase and rutile structures with a mean crystallite diameter of approximately 20 nm. N and Fe monodoping on AC/TiO2 reduced the energy band gap of TiO2 to 2.81 and 2.79 eV, respectively, which mainly attributed to the impurity energy formed in the energy gap of TiO2. In (N, Fe)-codoped AC/TiO2, N and Fe are incorporated into the TiO2 framework and narrow the band gap of TiO2 to 2.58 eV, thereby causing a large redshift. Codoping of N and Fe enhanced the production of hydroxyl radicals (⋅OH) and improved the photocatalytic activity of the resultant AC/TiO2 compared with those of undoped and N- or Fe-monodoped AC/TiO2. N-Fe-AC/TiO2 degraded 93 % of the formaldehyde under Xe-lamp irradiation. Moreover, the photocatalyst was easily recyclable. In summary, a novel and efficient method to mineralize low concentrations of HCHO in wastewater was discovered.

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Surface Modification of TiO₂Nanoparticles with Phenyltrimethoxysilane in Dye-sensitized Solar Cells

Cited by 9 publications

References 25 publications

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Dyes Extracted from Safflower, Medicago Sativa, and Ros Marinus Oficinalis as Photosensitizers for Dye-sensitized Solar Cells

Microwave-Assisted Synthesis of Carbon-Based (N, Fe)-Codoped TiO2 for the Photocatalytic Degradation of Formaldehyde

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Surface Modification of TiO2Nanoparticles with Phenyltrimethoxysilane in Dye-sensitized Solar Cells

Cited by 9 publications

References 25 publications

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Porphyrin-based hybrid silica-titania as a visible-light photocatalyst

Dyes Extracted from Safflower, Medicago Sativa, and Ros Marinus Oficinalis as Photosensitizers for Dye-sensitized Solar Cells

Microwave-Assisted Synthesis of Carbon-Based (N, Fe)-Codoped TiO2 for the Photocatalytic Degradation of Formaldehyde

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Product

Resources

About

Surface Modification of TiO₂Nanoparticles with Phenyltrimethoxysilane in Dye-sensitized Solar Cells