OPTICS COMMUNICATIONS
·
2017
·
IF 1.588
Xiaohui Ren,Hui Qiao,Zongyu Huang,Pinghua Tang,Shuhua Liu,Siwei Luo,Hao Yao,Xiang Qi,Jianxin Zhong
Hybridization of WS 2 and TiO 2 by a facile hydrothermal method was realized to construct WS 2 - TiO 2 heterostructure photodetector which exhibits preferable photoresponse activity in association with structural robustness. The relationship between photocurrent density and applied bias potential has also been uncovered. Photoresponse measurements demonstrate the photocurrent density of WS 2 - TiO 2 hybrid nanosheets (HNs) has been greatly improved when compared to that of as-prepared TiO 2 , while the steady current density can achieve 130 nA ∕ cm 2 when applied potential is 1.0 V. Besides that, the stability test exhibits no detectable distinction after processing 15 cycles. The improved photoresponse activities can be attributed into the positive synergetic effect between the WS 2 and TiO 2 . We hope the present work can provide fundamental implementations about WS 2 - TiO 2 heterostructure photodetector, meanwhile, offering it potential availabilities for constructing high-performance photodetectors.
研究领域:
材料科学
·
光电化学
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产品关联
DOI
高影响因子
Materials Today Chemistry
·
2018
·
IF 0
Ce Wang,Chao Tan,Weiqiang Lv,Gaolong Zhu,Zhaohuan Wei,Kelvin H.L. Zhang,Weidong He
In this work, we report the synthesis of a Bi 2 O 3 -TiO 2 hetero-junction (HJ) material through a facile colloidal method. The hetero-junction formation follows a growth with a 145°Bi 2 O 3 /TiO 2 crystal angle, owing to the large lattice mismatch between Bi 2 O 3 and TiO 2 crystals. With the Bi 2 O 3 -TiO 2 hetero-junction material as a photocatalyst , methyl orange is degraded completely within two hours under common UV-lamp irradiation. The photo-catalyst remains highly-active for complete photo-degradation of methyl orange even after multiple experiments. The remarkable photo-catalytic properties are attributed to the remarkable mono-dispersivity of the colloidal Bi 2 O 3 -TiO 2 nano-structure as well as the refined band structure with a valence band of 0.85 eV below that of TiO 2 crystal.
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
Surfaces and Interfaces
·
2023
·
IF 6.2
Jie Jiang,Yuqiang Ding
As a widely used semiconductor photocatalyst , TiO 2 has been explored in organic compounds hydrogenation. In this study, the hydrogenation of C=N bonds on the surface of TiO 2 was accomplished for the first time utilizing Cu 2 O/TiO 2 type-II (p-n) heterojunction . The probe reactions, hydrogenation of N -benzylphenylamine with benzyl alcohol, and N -methylation of amines with methanol exhibited that the hydrogenation of C=N bonds on TiO 2 surface can be achieved through borrowing hydrogen reaction (BH, alcohols as hydrogen source). Additionally, the BH reaction rate could be improved by adding external H + to the reaction system. The catalytic activity of Cu 2 O/TiO 2 was discovered to remain at an efficient level even after six reaction cycles.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 21
·10591-10598
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IF 8.867
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
In the development of photocatalytic hydrogen (H2) production, designing and optimizing photocatalyst nanostructures with efficient charge transfer and separation for catalytically active sites are still a great challenge. Herein, a well-controlled synthetic strategy is developed to prepare an Mo2C/TiO2 hetero-nanostructure, in which the TiO2 3D hierarchical configuration is loaded with highly dispersed Mo2C nanoparticles. This heterostructure achieves the excellent photocatalytic activity of 39.4 mmol h−1 g−1 with its rate ∼25 times higher than that of pristine TiO2. Also, our photocatalysts process excellent long-term durability (>20 h). The impressive photocatalytic H2 activity of Mo2C/TiO2 indicates favourable charge carrier dynamics, as determined by the results of photoluminescence (PL), time-resolved photoluminescence (TRPL), surface photovoltage (SPV), and open circuit potential (OCP) decay curves. Moreover, this study provides a guide for researchers to design new functional materials with excellent hydrogen production activity.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
DALTON TRANSACTIONS
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2018
·Vol. 47
·期 35
·12130-12137
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IF 4.099
Xiaofei Guo,Chuanxiang Qin,Mingyue Zhu,Jian-jun Wang,Jun Sun,Lixing Dai
A composite photocatalyst, with a BiOI/TiO2 heterojunction supported on carboxyl polystyrene spheres, was prepared using a two step hydrothermal reaction method. The products were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results show that the polystyrene microspheres were covered with smaller-sized BiOI microspheres, while nano-sized TiO2 particles were deposited on the surface of the flower-like BiOI microspheres. As an internal electric field exists when BiOI is hybridized with TiO2, the photogenerated carriers could be separated effectively and the resulting composite photocatalyst PS/BiOI/TiO2 had better performance for degrading rhodamine B in aqueous solution under visible-light irradiation with a 40 W incandescent lamp than that of PS/BiOI. Meaningfully, the composite photocatalyst can be recycled easily by filtering.
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
PubMed
高影响因子
Catalysts
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2024
·Vol. 14
·期 6
·335
·
IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Minquan Sun,Shuling Shen,Zhujun Wu,Zhihong Tang,Jiaping Shen,Junhe Yang
A novel rice spike-like g-C 3 N 4 /TiO 2 nanowire heterojunctions are fabricated by hydrothermal treating Na 2 Ti 3 O 7 ultralong nanotubes in the presence of g-C 3 N 4 . The presence of g-C 3 N 4 promotes the hydrolysis of Na 2 Ti 3 O 7 ultralong nanotubes. The partially replaced O of TiO 2 by N from g-C 3 N 4 leads to the formation of a tight-binding interface between one dimensional TiO 2 and two dimensional g-C 3 N 4 , which is crucial for fast and effective transfer of photogenerated electrons in heterostructured photocatalysts . As a result, the g-C 3 N 4 /TiO 2 nanowire heterojunctions exhibit excellent visible-light photocatalytic activity. The kinetic constant (k) of g-C 3 N 4 /TiO 2 (0.024 min −1 ) for degradation of methylene blue under visible light irradiation is 1.85 and 4 times than that of pure g-C 3 N 4 and P25, respectively.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Water Process Engineering
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2021
·
IF 5.485
Qi Wang,Wenming Zhang,Xiaoru Hu,Limei Xu,Guodong Chen,Xiaochen Li
A novel hollow-sphere structure of tungsten trioxide and titanium dioxide (WO 3 /TiO 2 ) heterojunction was prepared by using a combination of hydrothermal and calcination method. The prepared WO 3 /TiO 2 heterojunction was characterized with scanning electron microscope (SEM), X-ray diffractometer (XRD), Transmission electron microscopy (TEM), X-ray electron spectrometer (XPS), etc. The results showed that 10 % WO 3 /TiO 2 (the mass ratio of W in WO 3 to Ti in TiO 2 was 10 %) has a hollow spherical structure, and the bandgap energy of WO 3 /TiO 2 sample was lower than that of TiO 2 . WO 3 /TiO 2 heterojunction showed an improved photocatalytic performance, compared to pure TiO 2 and WO 3 as well as ZnO and SnO 2 , in degrading a high concentration dye methylene blue (MB) and a micro-organic pollutant metoprolol (MET) under visible-light. MB and MET removal efficiencies could reach 87.8 % and 67.1 %, respectively, within 150 min, by 10 % WO 3 /TiO 2 sample. The relevant photocatalysis mechanisms of the WO 3 /TiO 2 photocatalyst were revealed and discussed. TiO 2 in a heterojunction acted as a photo-generated holes acceptor, effectively decreasing the recombination of photo-generated carriers and improving photocatalytic performance. Our results indicate that the hollow spherical WO 3 /TiO 2 heterojunction is more promising candidate for wastewater treatment in practical applications.
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
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Xinjuan Du,Jindou Hu,Jing Xie,Aize Hao,Zhenjiang Lu,Yali Cao
The convenient modification of transition metal and the simultaneous adjustment of energy band are effective measures to improve the photocatalytic activity of titanium dioxide but remains challenging in photocatalytic hydrogen evolution field. Herein, In(OH) 3 -TiO 2 heterostructures were constructed by solid-state synthetic strategy under room temperature for tuning the band structure and accelerating the photoexcited charge separation to enhance the photocatalytic activity for hydrogen evolution. By the quantified modification of In(OH) 3 , the obtained In(OH) 3 -TiO 2 delivers an appreciable photocatalytic activity and stability for hydrogen evolution, which is 15.7 folds superior to commercial P25. Due to the narrowed band gap, the increased charge carrier density, the restrained recombination rate of photoexcited electron-hole pairs and the accelerated photogenerated charge separation, the In(OH) 3 -TiO 2 heterostructures thereby achieve the boosted photocatalytic hydrogen evolution performance. This work provides a feasible strategy to enhance the photocatalytic hydrogen evolution of TiO 2 via tuning the band gap and accelerating the photoinduced charge separation.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Colloid and Interface Science Communications
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2021
·
IF 4.914
Xueqin Wang,Helong Xu,Xiaohang Luo,Ming Li,Man Dai,Qihui Chen,Hua Song
Herein, CeO 2 /TiO 2 heterostructures are synthesized adopt a simple and profitable sol-gel technique. The nanostructures comprised of ultrafine and well-distributed CeO 2 nanoparticles on the TiO 2 surface. The obtained catalysts were characterized via X-ray diffraction, nitrogen adsorption , Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy , photoluminescence spectroscopy, and ultraviolet (UV)-visible spectroscopy tests. The as-prepared heterostructures exhibited a visibly enhanced photodegradation performance using phenol(38 ppm) as the model of organic pollutants . The achieved degradation efficiency was 99.1% under UV-light irradiation for 120 min and the TOC removal was 81.31% when using CeO 2 /TiO 2 as catalyst with the CeO 2 loading of 0.5%. The enhanced property was ascribed to the formation of a heterojunction after coupling CeO 2 with TiO 2 , which could capture the phenol molecules and improve the adsorption properties of the materials. Meanwhile, the heterostructures inhibited photogenic carriers recombination, thereby extending the optical response range. Furthermore, the as-prepared catalysts possessed favorable cycle performances and were reutilized for four cycles with insignificantly reduced property, the degradation rate were decreased slightly to 94.0% with a inappreciable decline in Ce and Ti leaching, suggesting it's preeminent stability and recyclability in the process of photocatalytic .
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
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Ao Jiang,Yuli Di,Shanhua Chen,Dafu Zhang,Xingyu Chen,Zhengdong Zhang,Xinyi Zhang,Qi Dong
The sol-gel method was used to prepare a series of muscovite/TiO 2 heterostructures for photocathodic protection of 304 stainless steels (304SS). The effects of different mass ratio of muscovite to TiO 2 (1:0.5, 1:1 and 1:1.5, denoted as MT-0.5, MT-1 and MT-1.5, respectively) on the crystal phase, grain size, light absorption properties and photoelectrochemical properties of TiO 2 and muscovite/TiO 2 heterostructures were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–visible diffuse reflection spectroscopy (UV–vis DRS). The corrosion resistances and photoelectrochemical properties of the 304SS coated with muscovite/TiO 2 heterostructures (304SS/MT) were studied through corrosion immersion test and electrochemical workstation in 3.5 wt% NaCl solution, respectively. In addition, Tafel curves and the electrochemical impedance spectroscopy (EIS) measurements were carried out to evaluate the photogenerated electron separation and transfer efficiency, and the interfacial charge transfer resistance of the 304SS and 304SS/MT electrodes, respectively. The time-dependent photocurrent responses of the MT-1 heterostructures demonstrated an enhanced photo-generated cathodic protection performance for 304SS substrates under visible light irradiation compared to TiO 2 . A photoinduced potential drop value for 304SS coated with MT-1 in 3.5 wt% NaCl solution was −0.54 V (vs. SCE). After immersion test, the corrosion image analyses of the 304SS, 304SS-MT, and 304SS coated with physically mixed muscovite/TiO 2 samples showed that the 304SS/MT-1 exhibits the best corrosion resistances . After connecting with 304SS/MT-1 in 3.5 wt% NaCl solution, the corrosion current densities ( i corr ) of 304SS increased significantly under the white light illumination, indicating more photoinduced electrons were migrated from the muscovite/TiO 2 heterostructures to the 304SS compared with that from pure TiO 2 . Furthermore, the simulated charge transfer resistance ( R ct ) of 304SS/MT-1 electrode is smaller than that of the 304SS electrode coated with TiO 2 , indicating that there exists an effective separation of the photogenerated electrons and holes, and a fast interfacial charge transfer after coating muscovite/TiO 2 heterostructures.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Ruili Lyu,Yiting Lei,Chi Zhang,Gaiping Li,Runping Han,Lina Zou
Due to widespread application of chlorpyrifos for controlling pests in agriculture, the continuous accumulation of chlorpyrifos residue has caused serious environmental pollution .The detection of chlorpyrifos is of great significance for humans and environment because it can arise a series of diseases by inhibiting acetylcholinesterase (AChE) activity. Photoelectrochemical sensing, as an emerging sensing technology , has great potential in the detection of chlorpyrifos. It is urgent that find a suitable photoelectric sensing strategy to effectively monitor chlorpyrifos. Herein, an n-n heterojunction was constructed by uniformly immobilizing n-type 3DBiOI, which had loose porous structure composed of numerous small and thin nanosheets , on the surface of TiO 2 with anatase/rutile (AR-TiO 2 ) heterophase junction. Under light irradiation , the proposed BiOI/AR-TiO 2 n-n heterojunction exhibited excellent optical absorption characteristics and photoelectrochemical activity. Additionally, the photoelectrochemical sensing platform demonstrated excellent analytical performance in monitoring chlorpyrifos. Under optimized conditions, it showed a wide detection range of 1 pg mL −1 - 200 ng mL −1 and a detection limit (S/N = 3) as low as 0.24 pg mL −1 , with superior selectivity and stability. The ultra-sensitivity and great specificity for detection of chlorpyrifos can be ascribed to chelation between Bi (Ⅲ) and C=N and P=S bonds in chlorpyrifos, which had been confirmed in this work. Meanwhile, the PEC sensor also had potential application value for monitoring chlorpyrifos in water samples, lettuce and pitaya, which the recoveries of samples ranged from 96.9% to 104.7% with a relative standard deviation (RSD) of 1.11%–5.93%. This sensor provided a novel idea for constructing heterojunctions with high photoelectric conversion efficiency and had a high application prospect for the detection of chlorpyrifos and other structural analogues.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）