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Inorganic and Composite Fibers || Photocatalytic Properties of TiO2 Composite Nanofibers Electrospun With Different Polymers
摘要： Electrospinning offers the possibility to create fibers with very fine diameters. Spinning ultrafine fibers with diameters in the range of some hundred nanometers from melt or solution has been established some decades ago. With electrospinning, depending on the exact technology, either continuous fibers or fiber mats with relatively narrow diameter distributions can be created from a broad range of materials, starting from polymers to composites and even ceramics. Due to their large inner surface area, nanofiber mats are typically used as filter materials, catalyzers, medical wound dressing, or for promotion of cell growth in biomedical applications. Electrospinning ceramic nanofibers can be performed by co-spinning a blend of polymer and ceramic precursor, followed by calcination to remove the polymer matrix and keep only the ceramic fibers. Alternatively, ceramic nanoparticles can be bonded on the surfaces of polymer nanofibers, or hybrid nanofibers can be formed, consisting of ceramic and polymer materials. In this way, electrospinning can be used to produce a broad variety of nanofibers, besides other typical methods such as self-assembly, use of templates, or drawing, for applications in life sciences, energy storage, dye-sensitized solar cells (DSSCs), electronic and magnetic devices, bonding, etc.
关键词： TiO2 nanofibers,Electrospinning,photocatalytic properties,calcination,polymer composites
更新于2025-09-23 15:21:01
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Cu2AgInSe4 QDs sensitized electrospun porous TiO2 nanofibers as an efficient photoanode for quantum dot sensitized solar cells
摘要： To obtain an efficient quantum dot sensitized solar cell (QDSC), a less toxic quaternary Cu2AgInSe4 QDs with 4.8 nm in size are synthesized by a simple hot injection method. The crystallite size and tetragonal structure are confirmed by XRD and HR-TEM analysis. Energy-dispersive X-ray spectroscopy analysis reveals that the atomic ratio of Cu: Ag: In: Se in the Cu2AgInSe4 QDs is 1.98:1.0:1.03:3.86. The oxidation state of the elements composed in Cu2AgInSe4 QDs is confirmed by XPS studies. Optical properties are studied from the UV–Vis–NIR absorption spectrum and photoluminescence emission spectrum. The porous TiO2 nanofibers (P-TiO2 NFs) are prepared from the conventional electrospun TiO2 NFs followed by the solvosonication process. The FE-SEM analysis is confirmed the porous texture of the TiO2 NFs. The bandgap of the Cu2AgInSe4 QDs and TiO2 NFs are determined from the Tauc plot and it was found to be 1.93 eV and 3.19 eV, respectively. QDSC is assembled using Cu2S counter electrode, polysulfide redox couple electrolyte and Cu2AgInSe4 QDs sensitized P-TiO2 NFs photoanode. The photoconversion efficiency (PCE) of the assembled QDSC is found to be 4.24%.
关键词： Tauc plot,QDSC,Porous TiO2 Nanofibers,Cu2AgInSe4 QDs,Hot injection method
更新于2025-09-23 15:19:57
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Highly efficient mixed-halide mixed-cation perovskite solar cells based on rGO-TiO2 composite nanofibers
摘要： In this investigation, the electrospun reduced graphene oxide-titanium oxide composite nanofibers as an electron transporting materials have been employed for the perovskite solar cells. The synthesized electron transporting materials have been used for the fabrication of mixed-cation lead mixed-halide (FAPbI3)0.85(MAPbBr3)0.15 perovskite solar cells. The influence of reduced graphene oxide on titanium oxide nanofibers and their morphological and electronic properties have been investigated in detail. The optimized device having FTO/Bl-TiO2/rGO4–TiO2/(FAPbI3)0.85(MAPbBr3)0.15/spiro-MeOTAD/Au configuration exhibited 17.66 % power conversion efficiency with an open circuit voltage of 1.070 V, short circuit current density of 22.16 mAcm-2 and fill factor of 0.754. This obtained efficiency is much higher than that of mesoporous- titanium oxide (14.39 %), pristine- titanium oxide nanofibers (15.82 %) and other reduced graphene oxide- titanium oxide composite nanofibers based electron transporting materials.
关键词： electron transporting materials,large grain size,high-efficiency,Perovskite solar cells,role of rGO in TiO2 nanofibers
更新于2025-09-19 17:13:59
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Light scattering effect of polyvinyl-alcohol/titanium dioxide nanofibers in the dye-sensitized solar cell
摘要： In the present work, polyvinyl-alcohol/titanium dioxide (PVA/TiO2) nanofibers are utilized as a light scattering layer (LSL) on top of the TiO2 nanoparticles photoanode. The TiO2 nanoparticles decorated PVA/TiO2 nanofibers display a power conversion efficiency (PCE) of 4.06%, which is 33% higher than tio2 nanoparticles without LSL, demonstrating the incorporation of PVA/TiO2 nanofibers as LSL reduces the radiation loss and increases the excitation of the electron that leads to high PCE. The incorporation of PVA/TiO2 nanofibers as LSL also increases the electron life time and charge collection efficiency in comparison to the TiO2 nanoparticles without LSL.
关键词： power conversion efficiency,dye-sensitized solar cell,PVA/TiO2 nanofibers,light scattering layer,electron life time
更新于2025-09-19 17:13:59
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Research on epoxy-based nanocomposites with high energy density and charge-discharge efficiency filled with Ti0 <sub/>2</sub> nanofibers
摘要： Capacitor films with high energy density are critical to energy storage. However, the energy density of state-of-the-art commercial capacitor films are limited by their low dielectric permittivity. In this study, epoxy-based nanocomposite films are prepared by filling with TiO2 nanofibers. Results show that nanocomposite films have larger discharge energy density because of the significant increase in dielectric permittivity, which caused by the additional interface polarization and space charge polarization. And a superior charge-discharge efficiency is achieved in the composite films at the same time due to the low dielectric loss. In addition, the composites also keep a high breakdown strength because of the dispersion of the nanofibers. The discharge energy density of 5.19 J/cm3 with the efficiency of 80% is achieved at 470 MV/m in the nanocomposites containing 2wt% nanofibers. The excellent energy density and charge-discharge efficiency of epoxy-based nanocomposites offer a promising opportunity for future researches and industrial application.
关键词： dielectric permittivity,energy density,epoxy-based nanocomposites,charge-discharge efficiency,TiO2 nanofibers
更新于2025-09-16 10:30:52
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Lily (Iris Persica) pigments as new sensitizer and TiO2 nanofibers as photoanode electrode in Dye Sensitized Solar Cells
摘要： In this study, lily (Iris Persica) dyes as sensitizer were examined by UV-Vis and FTIR analyses. Corresponding results showed that lily pigments effectively absorb incident light. This was mainly due to the presence of functional groups such as C=O and O-H in the pigment structure appeared on the FTIR analysis. This shows the appropriateness of lily pigment as sensitizer. On the other hand, anatase TiO2 nanofibers with different diameters were synthesized by Electrospinning method, using Titanium isopropoxide (TIPP) and polyvinylpyrrolidone (PVP) solution. The Electrospinning feed rate was altered from 0.1 to 0.5 mL/h to control the diameter of the TiO2 nanofibers. Other effective parameters including voltage, needle tip distance to collector and speed of collector were 25 kV, 15 cm and 500 rpm, respectively and were kept constant during synthesizing of nanofibers. The Synthesized nanofibers were analyzed and characterized by means of SEM, FESEM, XRD and TEM techniques. The FESEM and XRD analyses indicated that the nanofiber's diameter and crystallinity increase with increase in feed rate. The fabricated DSSC with 430nm TiO2 nanofibers (obtained from flow rate of 0.3mL/h) provided 1.72% energy conversion efficiency (? ), 50.78% conversion efficiency of photon to electron (IPCE), short-circuit current density (JSC) of 2.716 mA/cm2 and open circuit voltage (VOC) of 0.738V. The efficiency of the developed DSSCs, in comparison with the previously fabricated similar cells, were found higher, due to more effective absorption of light by the dyes and adsorption of pigment by nanofibers.
关键词： TiO2 nanofibers,wild lily dyes,Dye sensitized solar cell (DSSC),electrospinning
更新于2025-09-12 10:27:22
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Ag-decorated TiO2 nanofibers for highly efficient dye sensitized solar cell
摘要： For dye-sensitized solar cell, the modification of noble metals plays an important role in improving the light absorption of TiO2 films and reducing the recombination of electrons and holes. The composite photoanode of TiO2 nanoparticles/nanofibers (NP/NF) was prepared and soaked in AgNO3 solution at 0.01 mol/L, and the silver content was obtained according to different reduction times. The power conversion efficiency (PCE) increased from 5.39% to 6.36%. The PCE of composite photoanode increased by 18.0% compared with that of the photoanode without Ag modification.
关键词： TiO2 nanofibers,Ag-decorated TiO2 nanofibers,Solar energy materials,Dye sensitized solar cell,Nanocrystalline materials
更新于2025-09-11 14:15:04
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Green synthesized plasmonic nanostructure decorated TiO2 nanofibers for photoelectrochemical hydrogen production
摘要： We herein present the Au and Ag NPs synthesized via chemical reduction with green synthesized carbon nanolights (CNL) as a visible light photosensitizer for TiO2 nanofibers (TNFs) towards photoelectrochemical water splitting. The synthesized photoanodes (PA1: TNFs, PA2: Ag@CNLs/TNFs and PA3: Au@CNLs/TNFs) were probed ex-situ for morphological, structural, optical and electronic properties before being used for the PEC experiments. We first show the efficient photocatalytic activity of these photoanodes for the degradation of methylene blue under visible light irradiation. Followed by the photoelectrochemical (PEC) water splitting investigation, which reveals the substantially improved photocurrent density to 13 mA/cm2 and 18 mA/cm2, for PA2 and PA3, respectively under simulated AM 1.5 solar illumination at 1.36 V vs RHE, ~15 fold enhancement compared to that obtained for a PA1. This improvement we attributed to the synergic consequence, improved absorption and effective charge carrier separation & transport due to surface plasmonic effect, which is well evident in the decrease of measured charge transfer resistance (Rct), for PA2 (15.1 Ω) and PA3 (6.71 Ω), as compared to PA1 (139 Ω).
关键词： TiO2 nanofibers,Green synthesis,Hydrogen,Photo-electrochemical,Carbon quantum dots,Plasmonic nanostructures
更新于2025-09-11 14:15:04
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Photoelectrochemical water splitting properties of CdS/TiO2 nanofibers-based photoanode
摘要： CdS-sensitized TiO2 nanofibers (CdS/TiO2 NFs) structures were fabricated on the indium tin oxide (ITO) conducting substrate that acts as a working electrode in photoelectrochemical (PEC) cell for the generation of hydrogen by water splitting. TiO2 NFs on ITO conducting substrate were synthesized by electrospinning technique using Titanium tetraisopropoxide as the precursor, followed by a calcination process in air at 500 °C for 2 h. CdS deposition on TiO2 NFs structures was carried out by the dip coating method with different dipping times to optimize the water splitting efficiency. The morphologies and crystalline structures of fabricated samples were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The PEC properties of the electrodes were measured using a potentiostat instrument in a mixture of 0.25 M Na2S and 0.35 M Na2SO3 aqueous solutions for CdS/TiO2 photoanodes and in 0.5 M Na2SO4 electrolyte for uncoated TiO2 photoanode under the illumination of simulated sunlight (100 mW/cm2 from 150 W xenon lamp). It was found that an optimized TiO2 NFs structure sensitized by CdS layer yields a photoconversion efficiency of 3.2% at 0.0 V (vs. Ag/AgCl). The value of photocurrent density for CdS/TiO2 NFs samples were more than 20 times higher than that of the uncoated TiO2 NFs sample at 0.0 V (vs. Ag/AgCl) under a simulated sunlight irradiation.
关键词： photoelectrochemical water splitting,electrospinning,dip coating,hydrogen generation,CdS/TiO2 nanofibers
更新于2025-09-10 09:29:36
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Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO <sub/>2</sub> –Polyaniline Ternary Nanofibers
摘要： Herein, perylene-3,4,9,10-tetracarboxylic acid-doped polyaniline (PTP) nanofibers with/without photoreactive anatase TiO2 (TiO2?PTP and PTP, respectively) have been successively synthesized and subsequently decorated by Pt nanoparticles (Pt NPs) to prepare Pt?PTP and Pt?TiO2?PTP composites. High-resolution transmission electron microscopy confirms the presence of ～3 nm spherical-shaped Pt NPs on both the composites along with TiO2 on Pt?TiO2?PTP. Pt loading on the composites is deliberately kept similar to compare the methanol electro-oxidation in the two composites. The Pt nanocomposites along with the precursor polyanilines are characterized by optical characterization, X-ray diffraction study, X-ray fluorescence spectroscopy, and Raman spectroscopy. The ternary composite-modified (Pt?TiO2?PTP) electrode demonstrates high electrocatalytic performance for methanol oxidation reaction in acid medium than Pt?PTP and Pt?TiO2. The higher electrochemical surface area (1.7 times), high forward/backward current ratio, and the higher CO tolerance ability for Pt?TiO2?PTP make it a superior catalyst for methanol oxidation reaction in the electrochemical process than Pt?PTP. Moreover, the catalytic activity of Pt?TiO2?PTP is further enhanced significantly with light irradiation. The cooperative effects of photo- and electrocatalysis on methanol oxidation reaction in Pt?TiO2?PTP enhance the methanol oxidation catalytic activity approximately 1.3 times higher in light illumination than in dark. Therefore, the present work will be proficient to get a light-assisted sustainable approach for developing the methanol oxidation reaction activity of Pt NP-containing catalysts in direct methanol fuel cells.
关键词： photo-assisted,TiO2 nanofibers,methanol oxidation,electrocatalysis,Pt nanoparticles
更新于2025-09-04 15:30:14