INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
·
IF 2.93
Qizhao Wang,Guoxia Yun,Yan Bai,Ning An,Yutao Chen,Rongfang Wang,Ziqiang Lei,Wenfeng Shangguan
TiO 2 photocatalysts loaded CuS and NiS as co-catalyst were prepared by hydrothermal approach and characterized by XRD , UV–visible DRS , BET, XPS, SEM and TEM. When TiO 2 was loaded MS as co-catalyst, it showed higher photocatalytic activities for splitting water into hydrogen in methanol aqueous solution under 500 W Xe lamp. Among the photocatalysts with various compositions , the maximum evolution of H 2 obtained from 5 wt% CuS – 5 wt% NiS – TiO 2 sample was about 800 μmol h −1 , which was increased up to about twenty-eight times than that of TiO 2 alone. It was proven that CuS, NiS can act as effective dual co-catalysts to enhance the photocatalytic H 2 production activity of TiO 2 .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
FERROELECTRICS
·
2019
·
IF 0.697
Jun Liu,Yuguo Zhuo,Zefeng Zhang,Qingshan Li,Xiaofeng Guo,Xuejun Ren
TiO2/WPU/PVA nanofibers were prepared by electrospinning with modified nano-TiO2, waterborne polyurethane (WPU) and polyvinyl alcohol (PVA) as main materials that were blended mechanically. The nanofibers morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), Fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that nano-TiO2 was modified by r-aminopropyltriethoxysilanehe in order to improve the dispersion of nano-TiO2 in WPU/PVA matrix and the spinning quality of composite fibers was improved by adding proper amount of modified nano-TiO2. When the content of modified nano-TiO2 was 1%, the composite fibers with uniform diameter distribution were obtained. Results from FTIR and TG suggested that modified nano-TiO2 had been successfully introduced to the WPU/PVA nanofibers and TiO2/WPU/PVA nanofibers had the best thermal stability when the content of modified nano-TiO2 was 1%. Results from UV-Vis suggested that the photocatalytic performance of composite nanofibers that degraded methyl orange was enhanced by the addition of modified nano-TiO2.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Wang Yaju,Zhou Zhiming,Wang Chao,Zhao Leihong,Xia Qineng
The selective hydrogenolysis of glycerol to 1,3-propanediol (1,3-PDO) with high added value is attraction but challenging. Pt-WOx-based catalysts have been extensively studied in the selective hydrogenolysis of glycerol. The catalyst support and the physicochemical state of WOx play important roles on this reaction. In this paper, Pt-WOx catalysts supported on TiO2 with different crystal forms were prepared and studied for their catalytic performance in hydrogenolysis of glycerol. It was observed that the catalytic performance of anatase-type (A-type) TiO2-supported catalyst (Pt/W/A-Ti) is much better than that of the rutile-type (R-type) TiO2 catalyst (Pt/W/R-Ti) due to its higher stability. Furthermore, the influence of W loading amount and state were thoroughly investigated for the Pt/W/A-Ti catalysts, and Pt/W/A-TiO2 with 5 wt% loading of WOx achieved the best catalytic performance (100% conversion of glycerol and 41% yield of 1,3-PDO under the optimal reaction conditions), owing to the suitable WOx domains and high dispersion of W species, as evidenced by XRD patterns and TEM images. Mechanism study by in-situ DRIFTS experiments indicated that glycerol was first converted to 3-hydroxypropanal and then converted to 1,3-PDO through subsequent reactions.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5543-5553
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IF 5.287
Xin Zhao,Lei Huang,Supawadee Namuangruk,Hang Hu,Xiaonan Hu,Liyi Shi,Dengsong Zhang
A novel Zr–CeVO4/TiO2 catalyst was developed for the selective catalytic reduction (SCR) of NO with NH3. Both TiO2 nanosheets (TiO2-NS) and nanoparticles (TiO2-NP) with different crystal facets were used as supports for the catalyst. It was found that the TiO2-NS-supported catalyst showed much better activity, stability and H2O/SO2 durability than the TiO2-NP-supported catalyst. In particular, the catalyst loading amount was much lower than those of previously reported vanadate-based SCR catalysts. The crystal structures and morphologies were analysed by X-ray diffraction (XRD), Raman spectroscopy and (high-resolution) transmission electron microscopy ((HR)TEM). The redox properties, surface active species and acid sites of the catalysts were investigated through hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), ammonia and nitrogen oxide temperature-programmed desorption (NH3-TPD and NOx-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTs) experiments. The improved activity at lower temperature was due to the presence of more active oxygen species and Brønsted acid sites, as well as the formation of NO2 on the surface of the TiO2 nanosheets which have exposed (001) facets. The enhanced stability and H2O/SO2 durability of Zr–CeVO4/TiO2-NS was due to the limited formation of NH4NO3 and (NH4)2SO4/NH4HSO4. The excellent low operation temperature, low vanadium content and absence of WO3(MoO3) in this catalyst indicated that it has promising potential as a SCR catalyst for practical applications.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yu Huang,Xinyang Xu,Guangjian Fan,Xiaoxuan Zhu,Lin Zhu,Xi Chen
The effect of TiO 2 crystal phase on the photocatalytic properties of TiO 2 /g-C 3 N 4 heterojunction photocatalyst under sunlight irradiation was investigated through experiments and theoretical calculations. Results reveal that for TiO 2 /g-C 3 N 4 heterojunction photocatalyst, anatase phase TiO 2 can adjust the band edge positions to ensure the generation of strongly oxidizing radical species (·O 2- and ·OH), and rutile phase TiO 2 can effectively reduce the band gap to more efficiently utilize sunlight. Consequently, the combination of g-C 3 N 4 with P25 TiO 2 composed of both anatase and rutile phases is the most favorable combination for sunlight-driven photocatalyst among the obtained three TiO 2 /g-C 3 N 4 heterojunction photocatalyst. P25 TiO 2 and g-C 3 N 4 form a type-II/type-II heterostructure with stepped heterojunction and concave heterojunction. The P/CN photocatalyst exhibits excellent photocatalytic activity with degradation efficiencies for naphthalene reaching 100% within 120 min of sunlight irradiation, as well as considerable stability. The combination of P25 TiO 2 and g-C 3 N 4 has shown significant potentials in improving the separation and transfer efficiency of photogenerated electron-hole pairs, as well as enhancing the utilization of sunlight in photocatalytic process. This work provides a promising strategy for the preparation of highly active TiO 2 /g-C 3 N 4 heterojunction photocatalyst for the effective treatment of naphthalene from water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Shuo Wang,Bao Liu,Yu Zhu,Zirui Ma,Beibei Liu,Xu Miao,Ruixin Ma,Chengyan Wang
Perovskite solar cells (PSCs) as the most promising alternative to the Si solar cells have been developed rapidly in recent time. Superior electron mobility and conductivity of the compact layer material are necessary for high efficiency in perovskite solar cells by reducing excessive charge accumulation and guaranteeing effective electron injection at the compact layer/perovskite interface. In this study, Ru ions were introduced into traditional compact TiO 2 to improve the electron transporting layer (ETL) properties and conductivity performance. Ru 4+ was discovered in the Ru:TiO 2 according to the result of XPS. The reduced trap-filled limit voltage (V TFL ) of the Ru:TiO 2 compact layers showed that trap density in the Ru:TiO 2 film was lower than that of the pristine TiO 2 film. The PSCs based on 1 mol% Ru:TiO 2 exhibited the suitable band gap, low resistivity and high carrier density, comparing with the undoped compact TiO 2 , the charge transportation at the compact layer/mesoporous layer interface was enhanced with the incorporation of Ru, resulting in the reduction in hysteresis of the device. The power conversion efficiency (PCE) of the Ru-doped compact TiO 2 film based PSCs was improved from 14.83% to 18.35%.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
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2025
·
IF 7.9
Mengjiao Jiao,Yang Zhang,Guishang Pei,Zhuoyang Li,Xuewei Lv
This study focused on the high-temperature phase equilibrium of the Fe 2 O 3 -TiO 2 system by employing the classic phase equilibration and quenching method, X-ray diffraction, electron-probe microanalysis, and thermal analysis experiments. The solubility of the hematite, pseudobrookite, and rutile phases as the equilibrium temperature rose from 1100 °C to 1450 °C was determined. Besides, the solubility of TiO 2 in the spinel phase at 1450 °C was verified by experiments. A comprehensive comparison with the phase diagram optimized by Panda indicates that the solubility of solid solutions involved in the Fe 2 O 3 -TiO 2 system should be larger than the predicted one. Additionally, the ordered rutile phase was transformed into the high-temperature rutile-derived crystallographic shear structure at 1400 °C with Fe 2 O 3 higher than 15 mol%. Furthermore, the eutectic reaction of liquid → pseudobrookite + rutile occurred at 1512 °C. The liquidus was determined to be 1512 °C and 1535 °C at 30 and 75 mol% of TiO 2 , respectively. These measured phase equilibrium data are expected to provide reliable input for future thermodynamic reassessments of the Fe 2 O 3 -TiO 2 system within the CALPHAD framework.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Javid Khan,Naveed Ur Rahman,Wasim Ullah Khan,Asif Hayat,Zhiyong Yang,Gulzar Ahmed,Muhammad Nadeem Akhtar,Shengfu Tong,Zhenguo Chi,Mingmei Wu
Recently, organo-metal halide perovskite (e.g., CH 3 NH 3 PbI 3 ) solar cells have shown a significant surge in progress and efficiency. The photovoltaic performance of perovskite solar cells (PSC) extensively depends on the morphology of the materials at nano-level, because the intrinsic electrical, optical and electrochemical properties also change with a change in morphology. Different TiO 2 nanostructures with diverse dimensionalities, 0D hollow TiO 2 nanoparticles (HTNPs), 3D hollow TiO 2 mesospheres (HTMSs) and 3D hierarchical TiO 2 spheres (HTSs) were synthesized hydrothermally. The PSCs based on 3D HTSs or 3D HTMSs as electron transport layers (ETLs) shows better performance than the PSCs fabricated with 0D HTNPs as ETL. The enhanced results can be attributed to the better penetration of the perovskite materials in the porous network of the HTSs or HTMSs and decreased interfacial recombination due to superior charge extraction and electron transport at the HTSs/CH 3 NH 3 PbI or HTMSs/CH 3 NH 3 Pb interfaces. By using a self-assembled TiO 2 compact layer (c-TiO 2 ), followed by a mesoporous layer of HTSs, produces PSCs with an excellent efficiency of 15.08%. Such c-TiO 2 -ETL films may improve PSCs performance by enhancing electron extraction and block the photogenerated holes.
研究领域:
材料科学
·
太阳能
·
纳米技术
·
光伏
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1680
·
IF 3.1
Xiao Sang,Ke Han,Manfu Zhu,Liran Ma
Controlling friction by light field is a low-cost, low-energy, non-polluting method. By applying ultraviolet light on the surface of photosensitive materials, the properties of the friction pairs or lubricant can be influenced, thus achieving the purpose of reducing friction. In this study, TiO2, an inorganic photosensitive material, was selected to investigate the modulating effect of light fields on friction lubrication when using polyalphaolefin (PAO) base oil as a lubricant, and the modulation law of light fields on the friction lubrication behavior was investigated under different loads (1–8 N), different speeds (20–380 mm/s), and different viscosities (10.1–108.6 mPa·s) of PAO base oil. The experimental results showed that light treatment could reduce the friction coefficient of PAO4 base oil lubrication from 0.034 to 0.016, with a reduction of 52.9% under conditions of 3 N-load and 56.5 mm/s-speed, and the best regulation effect could be achieved under the mixed lubrication condition. After TiO2was treated with ultraviolet light, due to its photocatalytic property, PAO molecules were oxidized and adsorbed on the TiO2surface to form an adsorption layer, which avoided the direct contact of rough peaks and thus reduced the friction coefficient. This study combines photosensitivity, photocatalysis, and friction, presenting a method to reduce the friction coefficient by applying a light field without changing the friction pairs or lubricants, which provides a new direction for friction modulation and gives new ideas for practical applications.
研究领域:
材料科学
·
摩擦学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2014
·
IF 2.086
Yang Wang,Yali Cao,Yizhao Li,Dianzeng Jia,Jing Xie
TiO 2 nanorods with different crystal form and size have been successfully synthesized by two different solid-state chemical reaction routes. The composition and microstructure of as-synthesized materials were characterized by XRD , TGA , Raman, TEM , FESEM , BET, and DFT analysis. It was found that the growth of TiO 2 rod-like structure was directly assembled by anatase titanium nanoparticles about 20 nm in size. The photocatalytic activities of samples were investigated by measuring the degradation of methyl orange (MO) and methylene blue (MB) under UV or simulated sunlight irradiation. About 99% of MB was degraded by as-synthesized TiO 2 within 50 min, which revealed that samples had excellent photocatalytic activities. This study provides a simple and economical way to prepare high active anatase titanium photocatalysts .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 19
·17036-17043
·
IF 2.22
Zhi Guowei,Wang Wei,Zhang Ming,Hao Lingyun,Yang Lu,Liu Jijinhua,Zhao Yijie
In this work, a synergy structure to improve the photocatalytic properties of materials was proposed. CuSbS 2 nanoparticles synthesized by microwave irradiation method were dispersed in TiO 2 sol to form CuSbS 2 –TiO 2 nanoparticles. The properties of composite materials with different TiO 2 sol concentration were investigated by XRD, XPS, etc. The results indicated the as-synthesized CuSbS 2 nanoparticles exhibited chalcostibite structure and the TiO 2 showed anatase phase. The CuSbS 2 –TiO 2 nanoparticles had high absorbance in the visible light and good photocatalysts for the photodegradation reaction of Rhodamine B (RhB). When TiO 2 sol concentration was 0.23 mol/L, the sample possessed a photocatalytic degradation rate of 0.002 min −1 for the degradation of RhB, which was 3 times higher than that by the bare amorphous TiO 2 (0.0007 min −1 ).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2019
·
IF 3.327
Yangguang Yao,Jianhui Yuan,Xiaoxiao Chen,Liming Tan,Qingshan Gu,Wenjie Zhao,Jieshi Chen
Tungsten oxide (WO 3 ) is one of the most promising gas-sensitivity materials owing to its high decomposition temperature and stability of microstructure. The doping of oxides can significantly improve its gas-sensitivity properties. In this paper, WO 3 based coatings doped with TiO 2 were prepared via plasma spraying technology by using mixed feedstock suspensions containing a precursor as WCl 6 and a certain ratio of nano-TiO 2 . The characterization of microstructures and properties of the TiO 2 –WO 3 composite coatings were achieved and the gas sensitivity mechanism was researched. During the suspension plasma spraying, the solvent of the precursor droplets was evaporated and then the nucleation, crystallization and growth of WO 3 occurred. The crystallinity and crystal grains of WO 3 increased observably as the plasma spraying power improved. With the increase of TiO 2 in coatings, the average grain size of the TiO 2 –WO 3 composite coatings decreased at first and then increased. And the gas-sensitive properties of the composite coatings were significantly better than the pure WO 3 coatings. The gas-sensitive properties improvement of TiO 2 –WO 3 composite coatings doped with TiO 2 was firstly caused by the decrease of grains size, which leaded to an increase of the gas adsorption sites. And the Fermi level effect of the composite metal oxide heterojunction formed by TiO 2 and WO 3 also markedly enhanced the gas sensitivity properties of the composite coatings.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）