JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 3
·1983-1987
·
IF 1.149
Zhu Yajun,Zhang Xuebin,Ji Yi,Feng Yi,Zhang Jingcheng
This paper describes a procedure of synthesizing long WS2 nanofibers. WO3 nanofibers were prepared as precursors by electrospinning of ammonium meta-tungstate (AMT), polyvinyl alcohol (PVA) and alcohol solution followed by calcination at 550 °C in air. WS2
nanofibers were obtained by sulfurization of the WO3 nanofibres at 800 °C in an argon atmosphere, with sulfur powder acting as sulfuration reducer. The nanofibres were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron
microscopy (SEM), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). The results show that the final products are pure WS2 nanofibres, which have high aspect ratio. The WS2 nanofibers with rough surface were formed of nanoparticles, while some
nanoflakes appeared on the surface of WS2 nanofibres. The diameters of the WS2 nanofibers were between 200 and 300 nm, which is similar to WO3 nanofibers. In addition, the WS2 nanofibers were polycrystalline.
研究领域:
材料科学
·
纳米技术
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
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
·
环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jia Lei,Huanhuan Liu,Changpeng Yuan,Qiang Chen,Ji-An Liu,Fengchun Wen,Xinying Jiang,Wenjie Deng,Xudong Cui,Tao Duan,Wenkun Zhu,Rong He
The efficient, safe, and low-cost treatment of uranium-containing wastewater is still an urgent and meaningful problem. The uranium-containing wastewater system commonly contains a variety of soluble organics, which complex with hexavalent uranium (U(VI)) and thus increase the difficulty for U(VI) treatment. Herein, we introduced oxygen vacancy into WO 3 nanosheets to achieve highly efficient photocatalytic reduction of U(VI) and photo-degradation of organics. The WO 2.78 nanosheets showed U(VI) removal ratio of 95.6% with the reduction ratio of 84.5% in 8 mg/L of U(VI). Additionally, the maximum extraction capacity of U(VI) on WO 2.78 nanosheets reached 507.2 mg/g at 200 mg/L of U(VI). Meanwhile, the presence of excessive interfering ions and the cycle use of the WO 2.78 nanosheets hardly decreased the removal ratio of U(VI). The mechanistic study demonstrated that the introduction of oxygen vacancies not only broadened the response range of visible light, but also increased the adsorption of U(VI) over WO 3 nanosheets. Moreover, the decreased reduction potential of WO 2.78 nanosheets to U(VI) verified the enhanced photocatalytic activity of WO 2.78 nanosheets. Our work provided a successful example for the promotion of reduction efficiency toward U(VI) pollutants by the vacancy engineering in metal oxides.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 15
·2897-2904
·
IF 3.545
Beixi An,Yibing Luo,Jinglong Bai,Yanrong Wang,Xu Cheng,Jianpeng Li,Qiao Wang,Yifan Yang,Erqing Xie
In this study, we used a hydrothermal method to prepare WO3 nanospheres doped with a bimetal of Pd and Ni and used them in hydrogen sensing. The results show that the bimetal-doped WO3 nanospheres have a higher response, faster response/recovery time, and better selectivity than single metal-doped WO3. Moreover, they still have a high response to hydrogen at a low concentration. With 5 ppb of hydrogen, the sensor's response can reach 1.5, which is 1.5 times greater than that of pure WO3. Furthermore, the bimetal-doped WO3 has a shorter response time (14 s) and recovery time (8 s). This superior performance of the Pd/Ni-doped WO3 to hydrogen is most probably because of the strong adsorption of hydrogen, which results from the synergistic effect of two metals.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 3
·682-692
·
IF 1.1
Wu Jun,Zhao Lei,Yang Cuina,Zhang Yuhua,Sun Shengfei,Yao Lu
This paper adopted the hydrothermal method to prepare tungsten oxide (WO 3 ) nanorod films and studied the effects of precursor solution concentration (0.02, 0.03, 0.06 mol/L peroxytungstic acid) and annealing temperature (200, 300, 400 °C) on their electrochromic properties. The microstructure characterization of WO 3 films were performed using scanning electron microscope (SEM), X-ray diffraction (XRD), and transmission electron microscope (TEM), and their electrochromic properties were tested by combining an electrochemical workstation with an ultraviolet-visible spectrophotometer. The results showed that the precursor solution concentration directly affected the thickness (290, 560, 990 nm) and microstructure of WO 3 films, significantly impacting their electrochromic properties. However, the annealing temperature had a negligible effect. As the precursor solution concentration increased, the optical modulation of WO 3 films gradually decreased, reaching 51.1%, 43.8%, and 35.1%, respectively. The switching time first increased and then stabilized, with coloring times of 7.3, 7.7, and 7.7 s, respectively, and bleaching times of 3.8, 6.5, and 6.5 s, respectively. The coloration efficiency gradually increased but the increase was relatively small, reaching 41.8, 44.4, and 44.8 cm 2 /C, respectively. Moreover, the cycling stability of WO 3 films was poor, with the ratios of the final value of optical modulation to the initial value 0.33, 0.26, and 0.34, respectively. Additionally, there were bigger differences in the bleached state transmittance, while the colored state transmittance showed smaller variations. However, the former has better cycling stability than the latter. In summary, to obtain better electrochromic properties, the thickness of WO 3 films should not exceed 290 nm.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Chemosensors
·
2025
·Vol. 13
·期 2
·45
·
IF 3.7
Wenhao Li,Bo Zhang,Xiangrui Dong,Qi Lu,Hao Shen,Yi Ni,Yuechen Liu,Haitao Song
In this work, WO3/TiO2core–shell (C-S) nanowires (NWs) were successfully synthesized by the coaxial electrospinning method and subsequent high-temperature calcination treatment. After some microscopic structural characterizations, although the prepared WO3–TiO2and TiO2–WO3C-S NWs displayed quite different surface morphologies, both of the shell coatings were uniform and their typical shell thicknesses were extremely close, with mean values of 22 and 20 nm, respectively. In gas sensing tests, WO3/TiO2C-S NWs exhibited good selectivity towards triethylamine (TEA) without significant interfering gases. Compared with bare WO3and TiO2NWs, WO3/TiO2C-S NWs showed better gas sensing performance. Specifically, the optimal operating temperature and response of TiO2–WO3C-S NWs to 100 ppm TEA were 130 °C and 106, which were reduced by 70 °C and increased by 5.73 times compared to bare WO3, respectively. Obviously, the C-S nanostructures contributed to improving the gas sensing performance of materials towards TEA. Finally, some hypothetical sensing mechanisms were proposed, which were expected to have important reference significance for the design of target products applied to TEA sensing.
研究领域:
材料科学
·
纳米技术
·
传感器技术
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Zhaonian Li,Daorong Li,Zhanzhao Feng,Shuqi Lv,Qingxuan Zhang,Yanru Yu,Ying Tian,Runfeng Huang,Hongxia Chen,Kunfeng Zhang,Hongxing Dai
WO 3 nanorods and x WO 3 @TiO 2 (WO 3 /TiO 2 mass ratio ( x ) = 1−5) photocatalysts were synthesized using the hydrothermal and sol-gel methods, respectively. The photocatalytic activities of x WO 3 @TiO 2 for NH 3 oxidation first increased and then decreased with a rise in TiO 2 content. Among them, the heterostructured 3WO 3 @TiO 2 photocatalyst showed the highest NH 3 conversion (58 %) under the simulated sunlight irradiation, which was about two times higher than those of WO 3 and TiO 2 . Furthermore, the smallest amounts of by-products (i.e., NO and NO 2 ) were produced over 3WO 3 @TiO 2 . The enhancement in photocatalytic performance (i.e., NH 3 conversion and N 2 selectivity) of 3WO 3 @TiO 2 was mainly attributed to the formed interfacial electric field between WO 3 and TiO 2 , which promoted efficient separation and transfer of photogenerated charge carriers. Based on the results of reactive species trapping and active radical detection, photocatalytic oxidation of NH 3 over 3WO 3 @TiO 2 was governed by the photogenerated holes and superoxide radicals . This work combines two strategies of morphological regulation and interfacial electric field construction to simultaneously improve light utilization and photogenerated charge separation efficiency, which promotes the development of full-spectrum photocatalysts for the removal of ammonia.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sensors
·
2022
·
IF 9.618
Xiafen Hu,Xiang Li,Huimin Yang,Chengjia Xu,Weiqiang Xiong,Xiang Guo,Changsheng Xie,Dawen Zeng
Defect engineering has received extensive attention as an effective method to tune the gas sensing properties of semiconductor materials. Here, defective WO3 (D-WO3) nanosheets were obtained by a simple hydrogenation process with a detection limit as low as 5 ppb for dimethyl trisulfide (DMTS) and a response of 2.3 times that of the initial WO3 nanosheets to 100 ppb DMTS. Importantly, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the partial loss of oxygen atoms in D-WO3 nanosheets, and density functional theory calculations found that the W sites near the oxygen defect showed higher adsorption energy for DMTS and transferred more electrons during the gas interaction, indicating that the active W site caused by oxygen atom loss can effectively enhance the reactivity of two-dimensional WO3 nanosheets. Different from the traditional oxygen defect model, this work reveals the positive effect of active metal sites on gas sensing for the first time, which is expected to provide an effective reference for the sensing application of defect engineering in metal oxides.
研究领域:
材料科学
·
传感器技术
·
表面化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Zisheng Zhang,Chenxiao Zhao,Shuanglong Lin,Hong Li,Yalan Feng,Xin Gao
A novel oxygen vacancy (OVs) modified Bi 2 MoO 6 /WO 3 hybrid electrode based on the ITO glass was successfully fabricated by a facile two-step hydrothermal and solvothermal method with one calcination process between two reactions. The result exhibited an enhanced optical harvesting and photogenerated electron migration capability. In the degradation process of rhodamine B (RhB), the hybrid electrode showed a better photoelectrocatalytic removal ratio of 80.1% within 4 h under visible light irradiation and 2.0 V bias, which is mainly ascribed to the synergistic promotion of surface OVs, heterostructure and external bias. The optical features and band structures of the composite catalyst were analyzed to give out the possible electrode system mechanism of the PEC degradation process. This work not only constructs a newly designed OVs Bi 2 MoO 6 /WO 3 photoelectrode but also provides some investigations in fabricating and controlling process of photoelectrodes.
研究领域:
材料科学
·
环境科学
·
光催化
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Minji Yang,Huichao He,Hongping Zhang,Xiaohui Zhong,Faqin Dong,Gaili Ke,Yaqi Chen,Jinyan Du,Yong Zhou
High surface states induced photoelectrochemical (PEC) activity and stability issue is the major performance bottleneck for nanostructured WO 3 photoanode. Here we report that amorphous TiO 2 ( α -TiO 2 ) be used as passivator to modify the surface states of WO 3 nanoflakes film for improving its PEC water oxidation performance. In comparison with bare WO 3 film, the α -TiO 2 -coupled WO 3 ( α -TiO 2 /WO 3 ) film is of higher PEC water oxidation activity and stability. The photocurrent on α -TiO 2 /WO 3 film photoanode is improved by 2 times that reached 1.4 mA/cm 2 in 0.1 M Na 2 SO 4 solution at 0.8 V ( vs. SCE). After α -TiO 2 coupling, the UV–vis absorption edge and intensity of WO 3 film do not change obviously, but the formation and oxidation kinetics of H 2 O 2 on WO 3 photoanode are modified. The density functional theory calculations indicate the monoclinic WO 3 (002) has a surface energy of 1.17 J/m 2 , whereas the α -TiO 2 /WO 3 (002) with a much lower surface energy of 0.3 J/m 2 . Additionally, the length of Ti O bond of α -TiO 2 is changed from the initial 1.929 Å to a shorter length of 1.886 Å and a longer length of 2.290 Å in α -TiO 2 /WO 3 (002) through the O 2- -W 6+ bonding effect at α -TiO 2 /WO 3 interface. Therefore, the enhanced PEC water oxidation performance on α -TiO 2 /WO 3 film can be attributed to that α -TiO 2 passivates the surface states of WO 3 nanoflakes film, and the formation of H 2 O 2 from the photoexcited-electrons/dissolved-oxygen route is depressed and the PEC oxidation of H 2 O 2 is accelerated.
研究领域:
材料科学
·
能源化学
·
计算化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Changlin Yu,Fanyun Chen,Zhen Liu,Kai Yang,Hongbing Ji,Dehao Li,Wenyu Xie,Shaoyu Li
A series of robust AgCl/WO 3 composite microrods (0.1–0.2 μ m) with different Ag/W molar ratios (0.25, 0.50, 0.75, 1.00, 1.25) were synthesized via hydrothermal-calcination process. The obtained samples were characterized by XRD , SEM, TEM , FT-IR, UV-vis DRS, PL , BET, Raman, transient TPRT and EIS . The photocatalytic test for organic dyes degradation showed that AgCl/WO 3 microrods possess much higher photocatalytic activities and stability than bare AgCl and WO 3 . With optimal AgCl/WO 3 molar ratio (0.75 ∼ 1), 2 ∼ 5 times increase in dye decomposition efficiency was obtained over AgCl/WO 3 microrods. The formation of intimate WO 3 /AgCl heterojuction (interface) largely enhanced the separation efficiency of photogenerated carriers. This investigation suggested that AgCl/WO 3 microrods could a promising photocatalyst for environmental remediation.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8338-8346
·
IF 2.324
Song Kai,Ma Zizai,Yang Weiyou,Hou Huilin,Gao Fengmei
In the present work, we reported the fabrication of Fe-doped WO 3 nanofibers via a versatile electrospinning method towards efficient photoelectrochemical (PEC) water splitting. The resultant Fe-WO 3 nanofibers had a high purity in morphology, and the Fe doping levels within the WO 3 nanofibers were controlled in the range from 0.32 to 1.47 at.%, making the band gaps of WO 3 nanofibers tailored from 2.92 to 2.8 eV. The incorporated Fe dopants could not only increase the light absorption, but also improve the charge transport and charge transfer efficiencies, bringing an enhanced PEC activity of the WO 3 nanofiber photoanodes. The WO 3 nanofibers with the optimized 0.32 at.% Fe doping level exhibit the best PEC performance. The mechanism for the enhanced PEC behaviors was proposed.
研究领域:
材料科学
·
能源科学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）