CHEMICAL PHYSICS LETTERS
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2024
·
IF 2.8
Yelin Ding,Yiwei Zhao,Zhihui Deng,Kai Lian,Zhengtong Wang,Xiaohui Liu,Chun Sun
Halide perovskites have attracted widespread attention in the fields of photovoltaics, LEDs, lasers, and photocatalysis due to their unique optoelectronic properties. Here, we proposed a method to synthesize CsPbBr 3 /TiO 2 composite material by embedding precursors into mesoporous titanium dioxide pores and inducing in-situ growth of the perovskites within the pores. Due to the encapsulation of mesoporous TiO 2 , CsPbBr 3 maintains its excellent luminescent characteristics in water, air, and at high temperatures. Furthermore, the Z-type heterojunction structure formed between mesoporous TiO 2 and internal CsPbBr 3 significantly enhances the photo-generated current, and the response time has increased by 1.7 times.
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ACS Applied Energy Materials
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2024
·
IF 5.4
Jiajing Zhu,Hui Wang,Yuqi Zhai,Liangjun Huang,Jie Cui,Liuzhang Ouyang,Min Zhu,Jacques Huot
MgH2 is a promising solid-state hydrogen storage medium with a high hydrogen capacity and low cost, but it suffers from high hydrogen sorption temperatures. In this work, Cr-doped TiO2 solid solution nanocatalysts were synthesized and demonstrated to significantly reduce the hydrogen sorption temperatures and pressure of MgH2. The Ti(5Cr)O2 catalyzed MgH2 releases over 6.1 wt % of H2 at 200 °C, and even at 175 °C, 2.62 wt % H2 can be desorbed. The dehydrogenation activation energy is greatly reduced to 85.3 ± 8.7 kJ/mol, which is ∼49.7 kJ/mol less than that observed for pure MgH2. The dehydrogenated product can absorb 4.5 wt % of H2 within 10 s at a low temperature of −20 °C and back pressure of 30 bar, or the hydrogen uptake content can reach 4.81 wt % under 5 bar and 75 °C. The mechanism study indicates that the Cr-doped TiO2 can markedly reduce the adsorption energy and dissociation energy barrier of H2 molecules and greatly enhance the dissociation ability of H on the catalyst surface. This work demonstrates the potential of modified TiO2 as a cost-effective and efficient catalyst for Mg-based hydrogen storage materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Kaiyang Zhang,Chuanming Guo,Yun Wu,Rui Yao,Qiang Zhao,Jinping Li,Guang Liu
Ir-based electrocatalysts are commonly acknowledged as top-performing materials for water oxidation under acidic conditions. Decreasing the precious metal loading and improving the intrinsic activity of Ir sites are vital for creating effective electrocatalysts for PEMWE applications . Here, we employed a simple solvothermal method to create IrO x @TiO 2 core-shell structure electrocatalyst for efficient anodic OER in acidic environment. The obtained IrO x @TiO 2 requires an overpotential of only 227 mV to achieve 10 mA cm −2 and maintains such stability over 200 h. Furthermore the intrinsic and mass activity of IrO x @TiO 2 demonstrate a remarkable improvement of hundreds of times compared to that of IrO 2 . The core-shell structure of IrO x @TiO 2 possesses a high specific surface area , with the amorphous IrO x shell layer enhancing the catalytic activity of the Ir sites. Further structural analysis of the post-OER IrO x @TiO 2 revealed that the amorphous IrO x was effectively stabilized and high-valent IrO x generated on its surface may be more favorable for acidic water oxidation process. This study introduces a practical approach for developing high-performance, low-iridium-loading acidic OER electrocatalysts .
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 128
·期 2
·1095-1100
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IF 1.289
Mengzhu Liu,Zhiqiang Cheng,Juntao Yan,Linhui Qiang,Xin Ru,Fei Liu,Dawei Ding,Junfeng Li
A simple procedure is reported for the fabrication of TiO 2 nanofibers via electrospinning technique using polylactic acid (PLA), tetrabutyl titanate, and hexafluoroisopropanol as a spinning solution. TiO 2 nanofibers (600–700 nm in diameter), with bundled nanofibrils align in the fiber direction, are obtained from the calcination of the as-spun TiO 2 /PLA composite nanofibers at 550°C. The structure and physicochemical property of generated nanofibers are elucidated by Fourier transform-Infrared radiation spectrometer, X-ray diffraction, scanning electron microscope, and Thermogravimetric-differential thermal analysis, respectively. The photocatalytical activity of the TiO 2 nanofibers is testified by quantifying the degradation of methylene orange. The result indicates that the TiO 2 nanofibers with pure anatase phase, which are prepared at 550°C, shows an excellent photocatalytic activity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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DESALINATION
·
2012
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IF 2.59
Shanshan Zhao,Peng Wang,Ce Wang,Xin Sun,Linhuan Zhang
Poly (phthalazine ether sulfone ketone) (PPESK)/TiO 2 organic–inorganic composite ultrafiltration (UF) membranes with enhanced performance for high temperature condensed water treatment were prepared using a phase-inversion method. The effects of TiO 2 concentration on the membrane morphologies, physic-chemical properties, membrane permeability and antifouling performance were investigated and discussed. The SEM result reveals that the penetrated finger-like structure in sublayer is suppressed, and sponge-like structure begins to be developed. The mechanical strength and thermal stability of composite membrane are improved due to the existence of hydrogen bond between TiO 2 and polymer. The permeate flux is also enlarged due to the improved hydrophilicity and porosity. Compared with neat PPESK membrane, the composite membranes present improved antifouling properties, showing lower filtration resistances, MFI values and better flux recover property during high temperature condensed water treatment. The optimal addition amount of TiO 2 is 2 wt.%. The high temperature condensed water with excess oil and iron can be treated efficiently using PPESK/TiO 2 composite membrane. The turbidity of feed solution is almost removed. The oil and iron concentrations in permeate solution are 0.89 mg/L and 26.4 μg/L which meet the Quality Criterion of Water and Steam for Steam Power Equipment in China.
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SOLID STATE SCIENCES
·
2012
·
IF 1.856
Chunjing Zhang,Jinlong Yan,Chunxiao Zhang,Zhengpeng Yang
TiO 2 film imprinted by atrazine molecule at the surface of quartz crystal was prepared using molecular imprinting and surface sol-gel process. The molecularly imprinted TiO 2 film was characterized by scanning electron microscopy and cyclic voltammetry , and the atrazine adsorption was investigated by quartz crystal microbalance (QCM) technique. In comparison with non-imprinted TiO 2 film, the molecularly imprinted TiO 2 film exhibits high selectivity for atrazine, better reversibility and a much higher adsorption capacity for the target molecule, the adsorption equilibrium constant estimated from the in situ frequency measurement is about 6.7 × 10 4 M −1 , which is thirteen times higher than that obtained on non-imprinted TiO 2 film.
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Soft Matter
·
2010
·Vol. 6
·期 19
·4800-4806
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IF 4.869
Peng Tan,Jiping Huang,Dakang Liu,Wenjia Tian,Luwei Zhou
We fabricated TiO2 nanoparticles modified by a thin salt solution layer. The suspensions, formed by the nanoparticles in silicone oil, serve as model systems for exploring very general theories about interactions between colloidal particles with arbitrary ions confined on surfaces in the presence of an applied electric field. The system showed a static-yield-stress peak, not found before. The peak can be manipulated by tuning the amount of cations and anions confined in the salt solution layer. Excellent agreement between our experiment and theory reveals the mechanism concerning the competition between ions' polarized trapped state and conductively transmitted state. This work makes it possible to manipulate colloidal interactions by confining exogenous ions appropriately, and it is expected to have applications in colloidal science, materials engineering, and biotechnology.
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APPLIED SURFACE SCIENCE
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2012
·
IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
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Journal of Physical Chemistry C
·
2012
·
IF 4.805
Yangming Lin,Danzhen Li,Junhua Hu,Guangcan Xiao,Jinxiu Wang,Wenjuan Li,Xianzhi Fu
The polyaniline (PANI)/TiO2 nanocomposites have been successfully synthesized via a hydrothermal method and followed by a low-temperature calcination treatment process. We find that such a PANI/TiO2 nanocomposite exhibits higher photocatalytic activity and stability than bare TiO2 and TiO2-xNx toward the liquid-phase degradation of methyl orange (MO) under both UV and visible light (420 nm < λ < 800 nm) irradiation. More noteworthy, the PANI/TiO2 photocatalyst still perform good activity toward MO and 4-chlorophenol (4-CP) under the longer wavelength of light (550 nm < λ < 800 nm). The total organic carbon (TOC) tests show that the mineralization rate of MO and 4-CP over PANI/TiO2 are apparently higher than bare TiO2 under the irradiation of both UV and visible light. The presence of synergic effect between PANI and TiO2 is believed to play an essential role in affecting the photoreactivity. At last, the roles of active species in the photocatalytic process are compared by using different types of active species scavengers. Meanwhile, the degradation mechanism of the photocatalysts is proposed. It is hoped that our work could provide valuable information on the design of polymer modified semiconductor with more excellent properties and set the foundation for the further industrial application.
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Progress in Natural Science-Materials International
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2012
·
IF 1.099
Delong Li,Chunxu Pan
A process to fabricate a kind of novel micro–nano scaled TiO 2 /CuS composite fibers by electrospinning technique and chemical precipitation method was developed in the present study. The microstructures and photoelectronic properties of the fibers were characterized using SEM, FT-IR, UV–vis and fluorescence spectroscopy. The results revealed that the TiO 2 portion in the composite fibers was a mixture rutile and anatase phases while TiO 2 and CuS had been fully composite. The fibers had smooth surface with a diameter of 50–300 nm. Comparing with pure TiO 2 fiber, the TiO 2 /CuS micro–nano-scaled composite fibers exhibited a strong absorption in the visible light region and the efficiency of photo-induced charge separation were enhanced. This composite system is of widely potential applications in the areas such as solar cells, supercapacity, photocatalysis, etc.
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CHEMICAL PAPERS
·
2017
·Vol. 72
·期 2
·359-368
·
IF 1.258
Xia Bin,Yao Juan-juan,Han Chen-xi,Zhang Zhi,Chen Xiang-yu,Fang Yan-juan
The degradation of ofloxacin (OFX) at low concentration in aqueous solution by UVA-LED/TiO 2 nanotube arrays photocatalytic fuel cells (UVA-LED/TiO 2 NTs PFCs) was investigated. TiO 2 nanotube arrays (TiO 2 NTs) photoanode prepared by anodization-constituted anatase–rutile bicrystalline framework. The results indicated that the degradation efficiency of OFX by UVA-LED/TiO 2 NTs PFC was significantly enhanced by 14.3% compared with UVA-LED/TiO 2 NTs photocatalysis. The pH affected the degradation efficiency markedly; the highest degradation efficiency (95.0%) and the pseudo-first-order reaction rate constant k value (0.049 min −1 ) were achieved in neutral condition (pH 7.0). The degradation efficiency increased with the increasing concentration of dissolved oxygen (DO) in the UVA-LED/TiO 2 NTs PFC. The main reactive species of OFX degradation are positive holes (h + ) and superoxide ion radicals (O
·− 2
) in a DO sufficient condition. Furthermore, the possible pathways of OFX degradation were proposed.
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POLYMER BULLETIN
·
2017
·Vol. 75
·期 2
·623-635
·
IF 1.43
Zhang Qing,Li Deling,Zhang Hongxia,Su Guixian,Li Guanghui
Poly(lactic acid)/sesbania gum/nano-TiO 2 composites were prepared by melt blending in the mixing chamber of a torque rheometer in this work. The processing rheological properties, mechanical properties, morphologies, thermal properties, and optical properties of the resulting composites were evaluated. Effects of nano-TiO 2 content and plasticizer content on the processing rheological properties and mechanical properties of composites were discussed. Scanning electron microscopy micrographs clearly revealed good dispersion of nano-TiO 2 aggregates in the matrix at the low nano-TiO 2 content, while higher content contributed to easy aggregation within the matrix, which was consistent with the results of mechanical properties, thermal properties, and optical properties. As for the processing rheological properties, a reasonable choice of nano-TiO 2 and plasticizer content should be made depending on the used processing equipment and process.
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