Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 5
·3036-3043
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IF 11.301
Yating Wang,Chaosheng Peng,Tao Jiang,Jing Zhang,Zheng Jiang,Xingang Li
To improve solar light harvesting and charge separation efficiency, we develop a facile strategy for synthesizing defect-engineered three-dimensionally ordered macroporous (3DOM) WO3 photonic crystals via the colloidal crystal template method and subsequent H2/N2 atmosphere thermal treatment. The oxygen evolution rate of the obtained defect-engineered 3DOM WO3 (W270–400) is 40.1 μmol h−1, which is much higher than that of the untreated 3DOM WO3 and the defect-engineered WO3 nanoparticles. The enhanced performance is due to the good light harvesting and excellent charge transportion properties. The results show that the slow photon effect and bulk oxygen vacancy (VO) induced narrowed band gap greatly improve the light harvesting efficiency, while abundant surface VO can lower the valence band to increase the driving force for water oxidation, and thus significantly promote electron–hole separation. Our work can guide further design and preparation of high-efficiency defect-engineered 3DOM semiconductors for solar energy conversion.
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JOURNAL OF ELECTRONIC MATERIALS
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2020
·Vol. 49
·期 8
·4995-5002
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IF 1.774
Chen Mengshi,Xiao Ye
Tungsten oxide (WO 3 ) has been widely used as a photocatalyst for its suitable bandgap and relative stability. However, the high recombination rate of photo-generated carriers impedes raising the photocatalytic efficiency of tungsten oxide (WO 3 ) beyond its current value. In this work, a cadmium sulfide (CdS) and tungsten oxide (WO 3 ) Z-scheme heterostructure system was constructed which shows improved photocatalytic performance due to better hole-electron separation. In addition, photonic crystal fluorine-doped SnO 2 (FTO) was applied to the photoanode as a supporting framework for CdS and WO 3 , which can also play a role in assisting photocatalytic materials to assimilate light at the same time. As a result, the overall photocatalytic performance of a Z-scheme system on a photonic crystal framework has been significantly increased beyond that of conventional tungsten oxide.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Junchang Liu,Minghui Zhu,Weijie Yuan,Guoying Yang,Chen Zhang,Huayang Zhang,Dafeng Zhang,Peiqing Cai,Xipeng Pu
A unique lamellar WO 3 /AgI S-scheme heterojunction is constructed via integrated hydrothermal and coprecipitation methods. Optimized WO 3 /AgI composite shows significantly enhanced photocatalytic ciprofloxacin (CIP) degradation under visible light irradiation, achieving a removal rate of 53.4 % within 3 h, which is about 7.63 and 1.56 times superior than those of pristine WO 3 and AgI, respectively. The characterizations, experiment results and Density Functional Theoretical (DFT) calculation results confirm the enhanced light absorption, well-aligned straddling band structures and reasonable formation of S-scheme heterojunction with efficient photogenerated carriers transfer between WO 3 and AgI. Moreover, O 2 − and h + are identified as the main active species, with O 2 − plays a dominant role in WO 3 /AgI during the photocatalytic degradation of CIP. This work elucidates a possible approach to develop photocatalysts with a high antibiotic removal efficiency through a higher reducing ability and stronger oxidizing ability of S-scheme heterojunction by reasonable structure configuration.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Xuan Wu,Xingwu Guo,Chenjing Gao,Lewen Nie,Liming Peng,Juan Chen
A method to prepare mesoporous WO 3 thin films (represented by MP-WO 3 ) with a uniform pore size of ∼18 nm is developed successfully by utilizing poly(ethylene oxide)-b-polystyrene (PEO-b-PS) as the structure-directing agent (SDA). The properties of the gasochromic MP-WO 3 thin film are studied in detail and compared with the control groups prepared by using homopolymer PEO , PS, or their mixtures as SDA. Utilizing an optimized thermal treatment procedure, the gasochromic MP-WO 3 thin film of which the transmittance change Δ T is 59.1% exhibites the fastest coloration and bleaching speed with a coloration time of 27.3 s and a bleaching time of 19.7s as well as excellent reversibility within 90 cycles. This study offers a new strategy and insight into the development of mesoporous WO 3 hydrogen gasochromic films with excellent performances and paves its way toward the application of an optical hydrogen sensor.
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MOLECULES
·
2023
·Vol. 28
·期 24
·8013
·
IF 4.6
Yuzhou Xia,Xinghe Xia,Shuying Zhu,Ruowen Liang,Guiyang Yan,Feng Chen,Xuxu Wang
Visible-light-driven N2reduction into NH3in pure H2O provides an energy-saving alternative to the Haber–Bosch process for ammonia synthesizing. However, the thermodynamic stability of N≡N and low water solubility of N2remain the key bottlenecks. Here, we propose a solution by developing a WO3−xhollow sphere with oxygen vacancies. Experimental analysis reveals that the hollow sphere structure greatly promotes the enrichment of N2molecules in the inner cavity and facilitates the chemisorption of N2onto WO3−x-HS. The outer layer’s thin shell facilitates the photogenerated charge transfer and the full exposure of O vacancies as active sites. O vacancies exposed on the surface accelerate the activation of N≡N triple bonds. As such, the optimized catalyst shows a NH3generation rate of 140.08 μmol g−1h−1, which is 7.94 times higher than the counterpart WO3-bulk.Keywords:WO3;hollow sphere;O defect;N2reduction;photocatalysis
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2023
·
IF 4
Han Yu,Faguan Hu,Hongliang Xu,Bo Song,Hailiang Wang,Mingliang Li,Gang Shao,Bingbing Fan,Hailong Wang,Hongxia Lu
g-C 3 N 4 /WO 3 heterojunction composites were synthesized via an in-situ method by thermal polymerizing the mixture of dual precursors (urea and thiourea with molar ratio of 3:1) and different amount of tungstic acid. The as-synthesized g-C 3 N 4 /WO 3 composites, with lamellar and rod-like nano-porous structure, were mainly composed of g-C 3 N 4 and monoclinic WO 3 , in which the crystal size of WO 3 was about 5–10 nm. The specific surface area of the composite increased gradually with the tungstic acid dosage and reached 79.41 m 2 /g when the addition amount of tungstic acid was 1 wt%. The in-situ construction of g-C 3 N 4 /WO 3 heterojunction contributed to the reduction of band gap, improvement of the visible response range as well as the acceleration of the separation and migration of the photogenerated carriers. As the dosage of tungstic acid increased, the photocatalytic degradation performance of g-C 3 N 4 /WO 3 composite towards tetracycline improved gradually and achieved the optimum when the addition amount of tungstic acid was 0.1 wt% (CN/WO 3 -10). CN/WO 3 -10 (0.05g) degraded 83 % of tetracycline molecules (100 mL, 20 mg/L) after photocatalysis for 100 min, whose degradation rate constant was 10.1 and 1.48 times that of pure WO 3 and g-C 3 N 4 , respectively. Moreover, g-C 3 N 4 /WO 3 composite exhibited excellent stability and reusability for the photocatalytic degrading tetracycline. This work provides a facile and practicable approach for the preparation of g-C 3 N 4 /WO 3 composite.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Xueming Dang,Xiufang Zhang,Huimin Zhao
A novel photoelectrochemical (PEC) aptasensor based on the g-C 3 N 4 nanosheets modified WO 3 film with inverse opal photonic crystals (IOPCs) structure was developed. Oxytetracycline (OTC) aptamer was immobilized on the surface of composites through π-π interaction between g-C 3 N 4 and DNA nucleotide. Benefiting from the great optical absorption ability and photo-generated charge separation capacity, the g-C 3 N 4 /WO 3 IOPCs aptasensor exhibited excellent PEC response performance in an electrolyte containing 0.1 M ascorbic Acid (AA). After the recognition and capture of OTC, the configuration change of OTC-aptamer restrained the oxidation of AA by the photogenerated hole on the valance band of g-C 3 N 4 , resulting in photocurrent change. The results showed that the PEC aptasensor possessed a linear detection range from 1 nM to 230 nM and a detection limit of 0.12 nM (≈59.58 ng L −1 ) for the detection of OTC in water. The satisfactory detection results in real sample further revealed the potential of WO 3 IOPCs and its heterostructure for PEC analytical applications, and provided a novel approach for design of PEC platform.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
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2018
·Vol. 120
·期 7
·1700415
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IF 2.2
Meizhen Lu,Libo Peng,Qinglong Xie,Yong Nie,Xuejun Liu,Xianghong Lu,Jianbing Ji
At present, the utilization of grease has attracted more and more attention. This article presents a simple method that efficiently cleaves methyl oleate-derived methyl 9,10-epoxystearate ( a ) to give high yields of methyl 9-oxononanoate ( d ) with nonanal ( c ) as co-product. A WO 3 /MCM-41 catalyst is prepared via direct mixed-gel synthesis. The catalyst is tested in the oxidative cleavage of a to produce d which can be used as a polymer precursor or an important feedstock. The effects of WO 3 loading, temperature, time, H 2 O 2 / a molar ratio, catalyst/ a weight ratio, and t -BuOH/ a weight ratio on the a conversion and d yield are examined using single-factor experiments. The optimal reaction conditions are determined by orthogonal experiments. The optimal WO 3 loading, temperature, time, H 2 O 2 / a molar ratio, catalyst/ a weight ratio, and t -BuOH/ a weight ratio are 35%, 80 °C, 20 min, 1.3, 0.04, and 0.5, respectively. Under these conditions, the a conversion and d yield reach 99.4 and 78.4%, respectively. In addition, the catalyst shows no significant decrease in activity after being reused three times. Moreover, the reaction mechanism is studied based on the product distribution over time. Practical Applications : Few studies on methyl 9,10-epoxystearate used as the raw material to give methyl 9-oxononanoate and nonanal are found. Because the ethylene oxide bond is more unstable than the carbon–carbon double bond, the oxidative cleavage of methyl 9,10-epoxystearate is easier than cleavage of methyl oleate that allows the oxidative cleavage to be done under milder conditions. Methyl 9-oxononanoate can be converted to a monomer of high-value polymers and is also an important feedstock in the production of chemicals. The co-product nonanal is a natural spice which can be used in the fragrance industry. The results show that the reaction time is short and methyl 9-oxononanoate yield is high under mild reaction conditions. The method in this study can also be widely used in other oxidative cleavage reactions of epoxides. Methyl 9,10-epoxystearate is used as the raw material to produce methyl 9-oxononanoate with nonanal as co-product using WO 3 /MCM-41 as catalyst and H 2 O 2 as oxidant.
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Nanomaterials
·
2018
·Vol. 8
·期 10
·781
·
IF 3.504
Xinli Yang,Nan Wu,Yongxia Miao,Haobo Li
Tungsten oxide (WO3) and boron oxide (B2O3) were irreversibly encapsulated into the nanocages of the Zr-based metal organic framework UiO-66, affording a hybrid material B2O3-WO3/UiO-66 by a simple microwave-assisted deposition method. The novel B2O3-WO3/UiO-66 material was systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2adsorption, ultraviolet–visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray phosphorescence, and Fourier transform infrared (FTIR)-CO adsorption methods. It was found that WO3and B2O3were highly dispersed in the nanocages of UiO-66, and the morphology and crystal structure of UiO-66 were well preserved. The B2O3species are wrapped by WO3species, thus increasing the polymeric degree of the WO3species, which are mainly located in low-condensed oligomeric environments. Moreover, when compared with WO3/UiO-66, the B2O3-WO3/UiO-66 material has a little weaker acidity, which decreased by 10% upon the B2O3introduction. The as-obtained novel material exhibits higher catalytic performance in the cyclopentene selective oxidation to glutaraldehyde than WO3/UiO-66. The high catalytic performance was attributed to a proper amount of B2O3and WO3with an appropriate acidity, their high dispersion, and the synergistic effects between them. In addition, these oxide species hardly leached in the reaction solution, endowing the catalyst with a good stability. The catalyst could be used for six reaction cycles without an obvious loss of catalytic activity.Keywords:UiO-66;WO3;B2O3;metal organic frameworks;cyclopentene;glutaraldehyde
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2018
·Vol. 644
·期 18
·1072-1077
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IF 1.179
Kai Huang,Zhenyu Cai
This work presents the characterization and preparation of three-dimensionally ordered macroporous TiO 2 and TiO 2 /WO 3 composite nanoparticles with enhanced visible-light-responsive properties for rhodamine B (Rh B) photodegradation. The 3DOM TiO 2 and TiO 2 /WO 3 composites were prepared through a dip-infiltrating sol-gel process using a polystyrene (PS) colloidal crystal template. The materials were characterized by SEM, TEM, XRD, BET, XPS and UV/Vis. The 3DOM TiO 2 /WO 3 composite structures ranged from well-defined 3DOM structures, which are highly ordered and interconnected via small pore windows, to collapsed three-dimensional structures as the WO 3 content increased. The photoresponse range and specific surface area of the composite increased with less than 0.025 g of WCl 6 . The 3DOM TiO 2 /WO 3 composite with less than 0.025 g of WCl 6 exhibited a higher catalytic activity than 3DOM TiO 2 for the photocatalytic degradation of Rh B under simulated sunlight illumination.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jinguo Wang,Zimei Chen,Guangjun Zhai,Yong Men
Developing metal oxides with tailored surface oxygen vacancies is very important for heterogeneous photocatalysis. In this work, uniform WO 3 nanorods with tailored surface oxygen vacancies were prepared by a facile hydrothermal route, which exhibited highly enhanced photocatalytic activity for selective oxidation of alcohols to corresponding ketones in water medium. The physicochemical structural properties of uniform WO 3 nanorods have been characterized and correlated with their photocatalytic activities. Results indicated that the enhanced photocatalytic activity of uniform WO 3 nanorods was ascribed to the synergistic effect of the following three aspects: firstly, the high surface area favored the adsorption and diffusion of alcohol molecules; secondly, the small crystallite size shortened the transfer distance of photoelectrons and thus facilitated the fast transfer of photoelectrons, thereby restrained the recombination rate of photoelectron-hole pairs; finally, the surface oxygen vacancies acted as the photoelectron sinks could capture photoelectrons and promote their separation from holes. Meanwhile, the uniform WO 3 nanorods also demonstrated good stability owning to its stable crystal phase and robust morphological structure.
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THIN SOLID FILMS
·
2018
·
IF 1.939
Bo Wang,Chao Chen,Hongtao Liu,Bingbing Xia,Yinan Fan,Tianchi Chen
Tungsten trioxide (WO 3 ) and titanium dioxide (TiO 2 ) decorated commercial stainless steel meshes (SSM 304) were fabricated by chemical deposition and dip coating. WO 3 and TiO 2 particles were firmly and uniformly coated on the membrane surfaces, forming rough micro-nano double structures with underwater superoleophobicity, large contact angles and low oil-adhesion characteristic. Furthermore, the as-prepared membranes achieved effective oil-in-water (O/W) emulsions separation with high efficiency up to 98.5% or more. The separation of O/W emulsions was easily implemented under gravity with water fluxes of >200 L m −2 h −1 or low pressure with water fluxes up to 1300 L m −2 h −1 or more. In addition, the superhydrophilic membranes with WO 3 /TiO 2 coatings were demonstrated for high oil rejection, stable underwater superoleophobic properties after abrasion treatment and steady water permeation flux after several cycles.
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