- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Scalable Route toward Superior Photoresponse of UV-Laser-Treated TiO <sub/>2</sub> Nanotubes
摘要： Titanium dioxide nanotubes gain considerable attention as a photoactive material due to chemical stability, photocorrosion resistance, or low-cost manufacturing method. This work presents scalable pulsed laser modification of TiO2 nanotubes resulting in enhanced photoactivity in a system equipped with a motorized table, which allows for modifications of both precisely selected and any-large sample area. Images obtained from scanning electron microscopy along with Raman and UV?vis spectra of laser-treated samples in a good agreement indicate the presence of additional laser-induced shallow states within band gap via degradation of crystalline structure. However, X-ray photoelectron spectroscopy spectra revealed no change of chemical nature of the modified sample surface. Photoelectrochemical measurements demonstrate superior photoresponse of laser-treated samples up to 1.45-fold for an energy beam fluence of 40 mJ/cm2 compared to that of calcined one. According to the obtained results, optimal processing parameters were captured. Mott?Schottky analysis obtained from impedance measurements indicates an enormous (over an order of magnitude) increase of donor density along with a +0.74 V positive shift of flat band potential. Such changes in electronic structure are most likely responsible for enhanced photoactivity. Thus, the elaborated method of laser nanostructuring can be successfully employed to the large-scale modification of titania nanotubes resulting in their superior photoactivity. According to that, the results of our work provide a contribution to wider applications of materials based on titania nanotubes.
关键词： nanotubes,titanium dioxide,Mott?Schottky analysis,laser modification
更新于2025-09-12 10:27:22
-
TiO <sub/>2</sub> ‐PDVB Janus particles enhanced compatibility of titanium dioxide and recycled waste styrofoam
摘要： People are always puzzled by “white pollution” in recent decade. Recycling of waste styrofoam as a coating is a good sustainable solution to resolve this problem. However, the poor compatibility between inorganic additives and polymer hinders the application of recycled polystyrene. In this article, anisotropic Janus particles were used to increase the compatibility of titanium dioxide/waste styrofoam coatings. SEM results show that Janus particles can be anchored at the interface between styrofoam and titanium dioxide, increasing the dispersion of titanium dioxide, and improving the compatibility of inorganic particles and organic polymer. The glass-transition temperature of styrofoam coating increases from 77 (cid:1)C to 89 (cid:1)C in titanium dioxide/styrofoam contained 1 wt % of Janus particles, which certi?ed that Janus particles have compatibilization on titanium dioxide/styrofoam coating. Attributing to this compatibilization, the tensile strength of titanium dioxide/styrofoam with 1 wt % of Janus particles rises about 45% compared with titanium dioxide/styrofoam. The yield stress, storage modulus, and viscosity of titanium dioxide/styrofoam contained 1 wt % of Janus particles are the smallest and the closest to Newtonian ?uid. Janus particles used in the recycled styrofoam coating is bene?t to expand the application of waste styrofoam and the new anisotropic Janus compatibilizer. ? 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48691.
关键词： Titanium dioxide,compabilization,composite coatings,waste styrofoam,Janus particles
更新于2025-09-12 10:27:22
-
TiO2 Coated ZnO Nanorods by Mist Chemical Vapor Deposition for Application as Photoanodes for Dye-Sensitized Solar Cells
摘要： In this study, a mist chemical vapor deposition method was applied to create a coating of titanium dioxide particles in order to fabricate ZnO/TiO2 core–shell nanostructures. The thin layers of titanium dioxide on the zinc oxide nanorods were uniform and con?rmed as pure anatase phase. The morphological, structural, optical and photoluminescence properties of the ZnO/TiO2 core–shell structures were in?uenced by coating time. For instance, the crystallinity of the titanium dioxide increased in accordance with an increase in the duration of the coating time. Additionally, the thickness of the titanium dioxide layer gradually increased with the coating time, resulting in an increased surface area. The transmittance of the arrayed ZnO/TiO2 core–shell structures was 65% after 15 min of coating. The obtained ZnO/TiO2 core–shell nanostructures demonstrated high potentiality to serve as photoanodes for application in dye-sensitized solar cells.
关键词： chemical bath deposition,titanium dioxide,core–shell nanorods,mist chemical vapor deposition,zinc oxide
更新于2025-09-12 10:27:22
-
The Role of Thickness Control and Interface Modification in Assembling Efficient Planar Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have achieved tremendous success within just a decade. This success is critically dependent upon compositional engineering, morphology control of perovskite layer, or contingent upon high-temperature annealed mesoporous TiO2, but quantitative analysis of the role of facile TiCl4 treatment and thickness control of the compact TiO2 layer has not been satisfactorily undertaken. Herein, we report the facile thickness control and post-treatment of the electron transport TiO2 layer to produce highly efficient planar PSCs. TiCl4 treatment of TiO2 layer could remove the surface trap and decrease the charge recombination in the prepared solar cells. Introduction of ethanol into the TiCl4 aqueous solution led to further improved open-circuit voltage and short-circuit current density of the related devices, thus giving rise to enhanced power conversion efficiency (PCE). After the optimal TiCl4 treatment, PCE of 16.42% was achieved for PSCs with TiCl4 aqueous solution-treated TiO2 and 19.24% for PSCs with TiCl4 aqueous/ethanol solution-treated TiO2, respectively. This work sheds light on the promising potential of simple planar PSCs without complicated compositional engineering and avoiding the deposition and optimization of the mesoporous scaffold layer.
关键词： titanium tetrachloride,titanium dioxide,surface treatment,perovskite solar cell
更新于2025-09-11 14:15:04
-
Improved Reproducibility of PbS Colloidal Quantum Dots Solar Cells Using Atomic Layer–Deposited TiO <sub/>2</sub>
摘要： Thanks to their broadly tunable band gap and strong absorption, colloidal lead chalcogenide quantum dots (QDs) are highly appealing as solution-processable active layers for third generation solar cells. However, the modest reproducibility of this kind of solar cell is a pertinent issue, which inhibits the exploitation of this material class in optoelectronics. This issue is not necessarily imputable to the active layer but may originate from different constituents of the device structure. This work is focused on the deposition of TiO2 electron transport layer. Atomic layer deposition (ALD) greatly improves the reproducibility of PbS QD solar cells compared to the previously optimized sol-gel (SG) approach. Power conversion efficiency (PCE) of the solar cells using ALD-TiO2 lies in the range between 5.5 and 7.2%, while solar cells with SG-TiO2 have PCE range from 0.5 to 6.9% with a large portion of short-circuited devices. Investigations of TiO2 layers by atomic force microscopy and scanning electron microscopy revealed that these films have very different surface morphology. While the TiO2 films prepared by sol-gel synthesis and deposited by spin coating are very smooth, TiO2 films made by ALD repeat the surface texture of the FTO substrate underneath.
关键词： electron transporting layer,quantum dots,titanium dioxide,solar cells,atomic layer deposition
更新于2025-09-11 14:15:04
-
Cu-S codoping TiO <sub/>2</sub> /SiO <sub/>2</sub> and TiO <sub/>2</sub> /SiO <sub/>2</sub> /Fe <sub/>3</sub> O <sub/>4</sub> core-shell nanocomposites as a novel purple LED illumination active photocatalyst for degradation of diclofenac: the effect of different scavenger agents and optimization
摘要： Cu-S co-doped TiO2/SiO2 as a novel photocatalyst which is active in visible light was synthesized by simple sol-gel method. Also, Fe3O4 nanoparticles were used as the core to create a magnetically separable photocatalyst. The prepared samples were characterized by XRD, BET, BJH, DRS-UV/Vis, PL, FESEM, EDX, TEM, XPS, and VSM analysis. The photocatalytic effect of synthesized samples was examined on diclofenac (as a model hazardous contaminant) degradation. The central composite design was employed to optimize the operational parameters including irradiation time, pH, photocatalyst mass, and diclofenac concentration, whose optimal values were 213.85 min, 4.31, 0.06 g, and 10.25 mg L?1 for irradiation time, pH, photocatalyst mass, and diclofenac concentration, respectively. Under the optimum conditions, the photocatalytic degradation percentages of diclofenac at desirability function value of 1.0 were found to be 99.56%. The photocatalytic activity of the nanoparticles was also studied under sunlight. Overall, the UV/Vis spectrophotometry and total organic carbon results indicated that the synthesized nanoparticles have an extraordinary photocatalytic activity for the degradation of diclofenac under both purple LED and solar lights. Furthermore, different scavenger agents were investigated.
关键词： Diclofenac,LED light,Photodegradation,Titanium dioxide,Codoping,Scavenger agents
更新于2025-09-11 14:15:04
-
Dye-Sensitized Solar Cells Using Aluminum-Doped Zinc Oxide/Titanium Dioxide Photoanodes in Parallel
摘要： In this study, both zinc oxide (ZnO) nanorods and aluminum-doped zinc oxide (AZO) nanosheets were deposited by hydrothermal growth on ?uorine-doped tin oxide (FTO) glass. After a photoanode was added to ZnO nanorods or AZO nanosheets, the photovoltaic conversion e?ciency (PCE) increased due to improved electron transport and enhanced dye absorption. The improvement in electron transport was veri?ed by electrochemical impedance spectroscopy (EIS), and the increase in dye absorption was veri?ed by ultraviolet-visible spectroscopy. Both of these factors facilitated an increase in PCE. Parameters for dye-sensitized solar cells (DSSCs) using ZnO nanorods/TiO2 and AZO nanosheets/TiO2 photoanodes were tested and the results were recorded using EIS. The results indicated that the addition of the ZnO nanorods increased the short-circuit current density (Jsc) from 9.07 mA/cm2 to 10.91 mA/cm2, the open circuit voltage (Voc) from 0.68 V to 0.70 V, and the PCE from 3.70% to 4.73%, respectively. When the DSSCs were produced in a parallel silver-grid device, the results showed that PCE could be increased from 3.67% to 4.04% due to the reduction in connection resistance.
关键词： titanium dioxide (TiO2),dye-sensitized solar cells (DSSCs),parallel connection,aluminum-doped zinc oxide (AZO)
更新于2025-09-11 14:15:04
-
Titanium Dioxide Hole-Blocking Layer in Ultra-Thin-Film Crystalline Silicon Solar Cells
摘要： One of the remaining obstacles to achieving the theoretical ef?ciency limit of crystalline silicon (c-Si) solar cells is high interface recombination loss for minority carriers at the Ohmic contacts. The contact recombination loss of the ultra-thin-?lm c-Si solar cells is more severe than that of the state-of-art thick cells due to the smaller volume and higher minority carrier concentration. This paper presents a design of an electron passing (Ohmic) contact for n-type Si that is hole-blocking with signi?cantly reduced hole recombination. By depositing a thin titanium dioxide (TiO2) layer, we form a metal-insulator-semiconductor (MIS) contact for a 2 μm-thick Si cell to achieve an open circuit voltage (Voc) of 645 mV, which is 10 mV higher than that of an ultra-thin cell with a traditional metal contact. This TiO2 MIS contact constitutes a step towards high-ef?ciency ultra-thin-?lm c-Si solar cells.
关键词： titanium dioxide,Silicon photovoltaic,ultra-thin-?lm,selective contact
更新于2025-09-11 14:15:04
-
A Quarterthiophene-Based Dye as an Efficient Interface Modifier for Hybrid Titanium Dioxide/Poly(3-hexylthiophene)(P3HT) Solar Cells
摘要： This work focused on studying the in?uence of dyes, including a thiophene derivative dye with a cyanoacrylic acid group ((E)-2-cyano-3-(3,3,5,5-trihexyl-[2,2:5,2:5,2-quaterthiophene]-5-yl) acrylicacid)(4T), on the photovoltaic performance of titanium dioxide (TiO2)/poly(3-hexylthiophene)(P3HT) solar cells. The insertion of dye at the interface improved the e?ciency regardless of the dye used. However, 4T dye signi?cantly improved the e?ciency by a factor of three when compared to the corresponding control. This improvement is mainly due to an increase in short circuit current density (JSC), which is consistent with higher hole-mobility reported in TiO2/P3HT nanocomposite with 4T dye. Optical absorption data further revealed that 4T extended the spectral response of the TiO2/P3HT nanocomposite, which could also enhance the JSC. The reduced dark current upon dye insertion ensured the carrier recombination was controlled at the interface. This, in turn, increased the open circuit voltage. An optimized hybrid TiO2/P3HT device with 4T dye as an interface modi?er showed an average e?ciency of over 2% under-simulated irradiation of 100 mWcm?2 (1 sun) with an Air Mass 1.5 ?lter.
关键词： e?ciency,interface modi?er,photovoltaic,poly(3-hexylthiophene),oligothiophene dye,quantum e?ciency,titanium dioxide,absorption,polymers,hybrid solar cells
更新于2025-09-11 14:15:04
-
Studying the mix design and investigating the photocatalytic performance of pervious concrete containing TiO2-Soaked recycled aggregates
摘要： Demolished concrete, as one main form of construction and demolition wastes, has been widely studied of being utilized as recycled aggregates (RAs) in new concrete production. However, existing studies of applying RAs have been limited to the mechanical and durability issues of cementitious composites containing RAs. There has not been sufficient research of adopting RAs in cementitious products to also address the environmental sustainability. On the other hand, existing research utilizing cementitious products (e.g., concrete pavement) for air purification purpose have not adequately considered RA usage. Aiming to address the two sustainable objectives (i.e., waste diversion and air purification) simultaneously in concrete mix, this research adopted a two-step approach. Firstly, we studied and identified the optimal mix design of pervious concrete containing TiO2-soaked recycled coarse aggregates (RCAs) in order to achieve the higher compressive strength; secondly, we investigated the photocatalytic performance of pervious concrete containing RCAs coated with TiO2 photocatalysts. The photocatalytic performance of pervious concrete was also tested by applying a 10-min heavy rainwater wash. Experimental test results revealed that the internal voids of adhered mortar enabled RCAs to absorb more TiO2 particles. The NO degradation rate of TiO2-soaked RCAs increased from 71.4% to 80.6% when RCAs’ size decreased from 15-20 mm to 5e10 mm. The orthogonal experimental investigation indicated that water-to-binder ratio had the most significant effect on concrete compressive strength, followed by ratio of RCAs to binder, and replacement ratio of RCAs to natural aggregates. The optimized mix design for pervious concrete containing RCAs was identified to achieve highest strength (i.e., water-to-binder ratio at 0.35, coarse aggregate-to-binder ratio of 3 by mass, fly ash replacement rate to Portland cement at 5%, and 50% replacement ratio of RCAs to NCAs). The concentration of TiO2 solution at 0.3% was identified as the optimal ratio to achieve the highest NO degradation rate at 70% before rainwater wash. The NO degradation rates of pervious concrete still reached nearly 50% after 10-min heavy rainwater wash, indicating that pervious concrete using RCAs coated with TiO2 could largely maintain its photocatalytic capacity. This study addresses two main social and environmental issues in developing countries (e.g., China), namely overwhelming amount of construction & demolition wastes being generated, and air pollution. It leads to the cleaner production in concrete pavement construction by achieving the optimization between waste reuse, air purification, and engineering properties of porous concrete.
关键词： Pervious concrete,Photocatalytic effects,Mechanical properties,Recycled aggregate concrete,Titanium dioxide,Recycled aggregate
更新于2025-09-11 14:15:04