Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
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IF 4.706
Nan Zhang,Feng Li,Yanyang Yin,Jing Han,Xin Li,Caixia Liu,Jingran Zhou,Shanpeng Wen,Samira Adimi,Yu Chen,Xin Song,Shengping Ruan
WO 3 -TiO 2 heterostructural nanofibers (HNFs) were prepared by a simple two-step process. The structures, chemical constitutions and morphologies of the samples were characterized by various kinds of techniques, including XRD, XPS, EDX, SEM and TEM. The results suggested that WO 3 nanocubes with a size range of 80–120 nm were decorated uniformly on the surface of TiO 2 nanofibers in the WO 3 -TiO 2 samples. XPS results confirmed the existence of W 5+ and the increased amount of both chemisorbed oxygen species and oxygen vacancies after the WO 3 nanocubes were decorated on the surface of TiO 2 nanofibers. Compared with the pure materials, the WO 3 -TiO 2 HNFs exhibited higher response, better selectivity and lower limit detection to xylene. The improvement of the performance can be attributed to the formation of heterojunction between TiO 2 and WO 3 and the conversion between W 6+ and W 5+ . The sensing mechanism of the enhanced gas sensing properties was also discussed.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 14
·11276-11285
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IF 2.22
Deng Yuehong,Zhou Yi,Tang Haiqin,Xu Yifeng,Tan Yawen,Zou Hao,Xiang Ye
In this work, Bi spheres were deposited on bulk WO 3 ·0.33H 2 O and TiO 2 (P25) nanoparticles to form Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction material for the first time by a simple hydrothermal method. The as-prepared materials were comprehensively characterized by XRD, XPS, SEM, TEM, UV–Vis DRS, BET surface area, EIS, and Mott-Schottky analysis. The ternary Bi/TiO 2 /WO 3 ·0.33H 2 O composites exhibited superior degradation efficiency for RhB than pure WO 3 ·0.33H 2 O, TiO 2 (P25), and their binary composites. The degradation rate reached 99.84% after 30 min under simulated sunlight. The enhancement of photocatalytic activity could be attributed to the Z-scheme heterojunction system with metal Bi as an electronic medium, which greatly enhanced the efficiency of charge separation. This report demonstrated that Z-scheme Bi/TiO 2 /WO 3 ·0.33H 2 O heterojunction photocatalytic material has potential application value in dye wastewater treatment.
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Nanomaterials
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2020
·Vol. 10
·期 4
·724
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IF 4.324
Yongkui Huang,Shuangwu Kou,Xiaoting Zhang,Lei Wang,Peili Lu,Daijun Zhang
The rational fabrication of direct Z-scheme heterostructures photocatalysts is a pivotal strategy to boost the interfacial charge migration and separation. Herein, direct Z-scheme Bi2WO6/WO3composites were rationally fabricated for the degradation of bisphenol A combined with the activation of peroxymonosulfate (PMS). The tight interface contact between Bi2WO6and WO3was successfully formed by the in situ epitaxial growth of ultrathin Bi2WO6nanosheets at the surface of WO3nanorods. The Bi2WO6/WO3composite presented highly efficient catalytic performance toward degradation of BPA with PMS activation as compared to the WO3and Bi2WO6. PMS can dramatically boost the photocatalytic activity of the composites. Moreover, the results of active radical scavenging experiments revealed thath+, •O2−, and •SO4−are critical active species in the photodegradation reaction. Finally, the photocatalytic mechanism for the degradation of BPA is also discussed in detail. The great improvement of photocatalytic performance should be ascribed to the effective formation of the direct Z-scheme heterojunctions between Bi2WO6and WO3, resulting in improved light absorption, an efficient transfer and separation of photoinduced charge carriers, and a considerable amount of the electrons and holes with strong reduction and oxidation abilities. The study might provide new inspirations to design and construct heterostructured nanomaterials with outstanding photoactivity for environmental remediation.Keywords:bisphenol A;peroxymonosulfate;photocatalysis;composites;Z-scheme
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Minghuan Gao,Lisha You,Linna Guo,Tiesheng Li
Polyhedron-like WO 3 (n-type WO 3 ) nanoparticles were synthesized by a simple hydrothermal reaction without using any template or surfactant. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst was first synthesized by a simple impregnation-deposition way. The obtained samples were investigated by XRD, BET, XPS, SEM, TEM etc. The separation mechanisms of photo-induced electrons (e − ) and photo-induced holes (h + ) of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction samples were characterized by PL technique, EIS and determination of active sites and species in the photocatalytic reactions. In this p-n junction structure, Polyhedron-like WO 3 nanoparticles adhered to the surface of the Rod-like p-type Ag 2 CO 3 nanoparticles. The Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst showed much higher photocatalytic activity than both single materials for RhB degradation under UV–vis light irradiation, and even 17 times higher than commercial powders (P25) at the same circumstance. Even compared with the related photocatalyst, it still exhibits the highest photocatalytic ability. The highly enhanced photocatalytic of the Polyhedron-like WO 3 /Ag 2 CO 3 p-n junction photocatalyst can be attributed to extended absorption, more effective separation of photogenerated charges, the transfer rate of photo-induced charge carriers and forming of p-n junction system.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Fuhang Mai,Zhe Wen,Yunfei Bai,Zewei Ma,Kai Cui,Kai Wu,Fei Yan,Hong Chen,Yongdan Li
A WO3/γ-Al2O3 catalyst prepared by an incipient-wetness impregnation method is employed in the selective conversion of enzymatic hydrolysis lignin (EHL) into various alkylphenols in supercritical ethanol. In the reaction, EHL is completely dissolved and converted into aliphatic and aromatic compounds with a total yield of 363.4 mg/g lignin at 320 °C for 8 h. The yield of aromatic compounds is 315.8 mg/g lignin, accounting for 86.9% of the total yield of the products, and the overall selectivity of alkylphenols reaches 67.5%. Compared to WO3 and H2WO4, the WO3/γ-Al2O3 shows a higher activity for the conversion of EHL in supercritical ethanol. Besides, ethanol is found to be the most effective solvent for the depolymerization of EHL with the WO3/γ-Al2O3 catalyst. The WO3/γ-Al2O3 keeps the high catalytic activity in three reuses.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Yi Xiao,Zeqing He,Renshan Wang,Xueqin Tao,Benxia Li
Notwithstanding intensive research in recent decades, the conspicuous restrictions in photocatalysts still remain as low utilization of visible light, poor charge transfer/separation, and insufficient surface active sites. Designing semiconductor heterostructures as photocatalysts is a promising approach to enhance the photocatalytic efficiency for degrading organic pollutants. In this work, a novel WO 3 /BiOCl p–n heterostructure photocatalyst with optimal molar ratio was successfully fabricated by growing BiOCl nanosheets on WO 3 nanofibers through the electrospinning method followed with a solvothermal process. The optical properties and photoelectrochemical tests indicated that the WO 3 /BiOCl heterostructures possess high ability of photogenerated charge separation. The photocatalytic performance of the as-obtained materials was assessed by the degradations of rhodamine B (RhB) and phenol in water under visible light. Compared with pure WO 3 nanofibers and BiOCl nanosheets, the WO 3 /BiOCl heterostructure catalysts showed improved photocatalytic efficiencies, and the apparent rate constant of RhB degradation is 0.259 min −1 on the optimal WO 3 /BiOCl(2) sample, which is about 2.3 times that of pure BiOCl (0.113 min −1 ). The roles of different active species in the photocatalytic system were determined by active-species-eliminating experiments, revealing that the photogenerated holes play a leading function in the degradation of organic pollutants. The enhanced photocatalysis of WO 3 /BiOCl(2) heterostructures results from the joint effect of high activity of BiOCl nanosheets, anti-agglomeration of WO 3 nanofibers, and well-matched straddling band-structures for charge separation. This photocatalyst presents great potential in the removal of organic pollutants from aquatic environment.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
A novel Ag nanoparticles (NPs) decorated WO 3 nanoplates/g-C 3 N 4 (CN) nanosheets 2D/2D heterostructure was successfully synthesized by a solvent evaporation and in situ calcination method. The as-prepared WO 3 /Ag/CN ternary composite exhibited remarkably enhanced photocatalytic activity towards rhodamine B (RhB) and tetracycline (TC) degradation compared with WO 3 , CN, Ag/WO 3 , Ag/CN and WO 3 /CN under visible light irradiation. The enhanced photocatalytic activity could be attributed to the efficient separation of photogenerated charge carriers, the strong redox ability and enhancement of visible-light absorption derived from the construction of Z-scheme 2D/2D heterostructure. Ag NPs not only possess the surface plasmon resonance (SPR) effect, but also act as an electron mediator in Z-scheme heterostructure. The UV–vis absorption spectra analysis indicated that the loading of Ag NPs can enhance the visible-light adsorption. And the decreased photoluminescence and the increased photocurrent demonstrated the high separation rate of photoinduced charge carriers owing to the successful heterojunction construction. Furthermore, the possible degradation pathways of RhB and TC were proposed according to HPLC-MS analysis. The results of radical trapping experiments indicated that O 2 − and OH were the primary active species during the photocatalytic degradation process.
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Lei Chen,Ding Weng,Jiadao Wang,Duan Weng,Li Cao
The CeO 2 -TiO 2 (CeTi) and CeO 2 /WO 3 -TiO 2 (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH 3 -NO/NO 2 selective catalytic reduction (SCR) performance was studied. N 2 O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO 2 /NO x ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH 3 -NO/NO 2 SCR performance due to the catalyst reoxidation rate by NO 2 higher than by O 2 . Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NO x performance under NH 3 -NO/NO 2 SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO 3 provides more acid sites which accelerate the reaction between NH 4 NO 3 and NO to get a superior low-temperature activity. Amount of N 2 O formation shows a peak at 250 °C mainly derived from NH 4 NO 3 decomposition.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Kedir Ebrahim Ahmed,Dong-Hau Kuo,Misganaw Alemu Zeleke,Osman Ahmed Zelekew,Angaw Kelemework Abay
Sn-WO 3 /g-C 3 N 4 composites were synthesized by calcination method. The materials were characterized with different techniques and photocatalytic activities examined by the degradation of anionic methyl orange (MO) and cationic Rhodamine B (RhB) under visible light. 8% Sn-WO 3 /g-C 3 N 4 showed superior degradation efficiency with 87% MO and 99% RhB dye removal within 120 and 50 min of irradiation time, respectively. X-ray photoelectron spectroscopy (XPS) analysis reveals molecular oxygen adsorption on the surface of the as-prepared composite material. The introduction of tin in Sn-WO 3 solid solution with a high atomic Sn:W ratio of 1:2 and the construction of interfacial hetrojunction with graphitic carbon nitride (g-C 3 N 4 ) plays a vital role to enhance the photocatalytic activity of the as-prepared composites by activating oxygen to react with dye molecules.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2014
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IF 5.03
G.F. Cai,J.P. Tu,D. Zhou,X.L. Wang,C.D. Gu
Vertically aligned hierarchical WO 3 nano-architectures on transparent conducting substrate (3×2.5 cm 2 in size and sheet resistance R s =10 Ω) are produced via a template-free solvothermal method . The nanostructured array films with thicknesses of about 1.1 μm show remarkable enhancement of the electrochromic properties in visible spectrum and infrared region . In particular, a significant optical modulation (66.5% and 66.0% at 633 nm, 73.8% and 53.9% at 2000 nm, 57.7% and 51.7% at 8 μm), fast switching speed (4.6 s/3.6 s and 2.0 s/3.4 s), high coloration efficiency (126 and 120 cm 2 C −1 at 633 nm) and excellent cycling stability (maintained 77.5% and 81.7% of the initial optical modulation after 4500-cycles) are achieved for the nanotree and nanowire arrays, respectively. The improved electrochromic properties are mainly attributed to the vertically aligned structure and the porous space among the nanotrees or nanowires, which make the diffusion of H + in these arrays easier and also supply larger surface area for charge-transfer reactions.
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ACS Applied Materials & Interfaces
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2015
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IF 6.723
Zhiyang He,Qiao Liu,Huilin Hou,Fengmei Gao,Bin Tang,Weiyou Yang
In this work, polycrystalline WO3 nanobelts were fabricated via an electrospinning process combined with subsequent air calcination. The resultant products were characterized by X-ray diffraction, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy in regard to the structures. It has been found that the applied voltage during the electrospinning process played the determined role in the formation of the WO3 nanobelts, allowing the controlled growth of the nanobelts. The ultraviolet (UV) photodetector assembled by an individual WO3 nanobelt exhibits a high sensitivity and a precise selectivity to the different wavelength lights, with a very low dark current and typical photo-dark current ratio up to 1000, which was the highest for any WO3 photodectectors ever reported. This work could not only push forward the facile preparation of WO3 nanobelts but also represent, for the first time, the possibility that the polycrystalline WO3 nanobelts could be a promising building block for the highly efficient UV photodetectors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Cunbiao Song,Guitai Wu,Beilei Sun,Yao Xiong,Sheng Zhu,Yongming Hu,Haoshuang Gu,Yu Wang,Wanping Chen
Pt–WO 3 porous composite ceramics have been prepared from Pt and WO 3 nanoparticles through pressing and sintering. These ceramics exhibit extraordinary room-temperature sensing capabilities, including high sensitivities, fast response and recovery speeds, and good stability, for low concentrations of hydrogen (at and below 1000 ppm) in air; while for high concentrations of hydrogen (above 2000 ppm) in air, the recoveries in air are only partial in given amounts of time. We propose that for low concentrations of hydrogen, the response results from the reaction of hydrogen with chemisorbed oxygen on WO 3 ; while for high concentrations of hydrogen, hydrogen chemisorption on WO 3 will occur after all chemisorbed oxygen on WO 3 is reacted. The relatively high stability of chemisorbed hydrogen on WO 3 is responsible for the observed partial recoveries. Our results show that Pt–WO 3 composite ceramics are highly competitive for sensing low concentrations of hydrogen in air at room temperature among various metal oxide semiconductor bulk materials.
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