JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 14
·5492-5498
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IF 5.101
Jun Zhang,Jiang-ping Tu,Xin-hui Xia,Xiu-li Wang,Chang-dong Gu
A hexagonal WO3 nanowire array film is obtained using a template-free hydrothermal method by adding ammonium sulfate as a capping agent. The WO3 nanowires grown vertically on a FTO-coated glass substrate are woven together at the surface of the film, forming well-aligned arrays at the bottom part and a porous surface morphology. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) reveal that each nanowire is a hexagonal single crystal and their long axes are oriented toward the [0001] direction. Due to the highly porous surface, good contact with the conductive substrate and large tunnels of the hexagonal-structured WO3, a fast switching speed of 7.6 and 4.2 s for coloration and bleaching, respectively, and a high coloration efficiency of 102.8 cm2C−1 are achieved for the WO3 nanowire array film.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2014
·
IF 4.086
Wenzhang Li,Guanhua Jin,Haishi Hu,Jie Li,Yanghui Yang,Qiyuan Chen
Dye-sensitized solar cells (DSSCs) based on phosphotungstic acid–TiO 2 composites (PT) and WO 3 nanoparticle incorporated TiO 2 photoanodes were successfully constructed by doctor blading TiO 2 paste containing PT and various amounts of WO 3 . Film features were investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and ultraviolet–visible spectroscopy. Photoelectrochemical properties were examined by the photocurrent–voltage ( J – V ) curves as well as monochromatic incident photon-to-photocurrent conversion efficiency and electrochemical impedance spectroscopy (EIS) measurements. Compared with the DSSC based on pure P25 films, that based on PT/P25 films yielded a 16.9% higher J sc and a 21.3% higher η , while that based on PT/P25 + 1/70WO 3 films resulted in a 49.2% higher J sc and a 40.3% higher η . EIS data demonstrated that charge transfer resistance was clearly reduced by introducing PT and WO 3 into TiO 2 films. The introduction of PT and WO 3 was observed to promote electron transfer and retard recombination synergistically, leading to a significant improvement in cell performance.
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
CATALYSIS LETTERS
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2020
·Vol. 151
·期 1
·124-137
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IF 2.482
Xi Zhiwen,Jia Wenzhi,Zhu Zhirong
Abstract Two series of WO 3 –ZrO 2 and WO 3 –ZrO 2 –TiO 2 composite oxides were prepared via an Evaporation Induced Self Assembly (EISA) method and applied for the hydrogenolysis of glycerol after loading with Pt. Several techniques like XRD, BET, Raman spectroscopy, NH 3 -TPD, Py-IR, TEM and XPS were adopted to characterize the physicochemical properties of the as-synthesized catalysts. The structure and catalytic activities of these catalysts were significantly affected by the calcination temperature of the composite oxides. The introduction of TiO 2 into Pt/WO 3 –ZrO 2 could inhibit the drastic decrease in catalytic performance due to the formation of inactive crystalline WO 3 under high calcination temperature of 800 ℃. A maximum activity was obtained on the Pt/WO 3 –ZrO 2 –TiO 2 catalyst when the calcination temperature was 600 ℃, which gave 73.8% glycerol conversion and 25.4% 1,3-propanediol yield. While the Pt/WO 3 –ZrO 2 catalyst only exhibited 53.4% glycerol conversion and 20.2% 1,3-propanediol yield. The enhanced activity of Pt/WO 3 –ZrO 2 –TiO 2 was ascribed to the improved acidity originating from (i) higher acidic properties of WO x species when linked to Ti with larger electronegativity other than Zr and (ii) new acid centers caused by heteroatoms linkage as the combination of ZrO 2 and TiO 2 . The effects of Pt loading amount and reaction temperatures were also investigated. Graphic Abstract
研究领域:
催化化学
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材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·
IF 0
You Mengyun,Wu Shufeng,Feng Xiaotong,Zhao Yong,Wang Yubin,Zhang Zhang
The enhancement effect of Ce modification on V 2 O 5 -WO 3 /TiO 2 catalysts at low temperatures was investigated for the selective catalytic reduction (SCR) of NO x with NH 3 (NH 3 -SCR). By adding 9% CeO 2 to 0.5%V 2 O 5 -3%WO 3 /TiO 2 catalyst, the low-temperature denitrification performance of Ce 9 V 0.5 W 3 Ti catalyst after Ce modification was significantly improved, achieving a NO conversion above 90% within a broad temperature range of 200–350℃, with catalytic activity comparable to that of 3% V 2 O 5 -3% WO 3 /TiO 2 . The catalysts were characterized by XPS, H 2 -TPR, NH 3 , and NO-TPD. The results indicated that the Ce additive could enhance the adsorption of NO x on Ce 9 V 0.5 W 3 Ti catalyst due to the synergetic interaction among the Ce and V, W species. The interaction between V and Ce also promoted the formation of V 5+ and Ce 3+ on the surface of the catalyst, which was conducive to enhancing the adsorption and oxidation capacity of the catalyst for NO. Additionally, the introduction of Ce led to a substantial deposition of nitrate species on the surface of the catalyst, especially the increase of nitrite species, which was beneficial to the NH 3 -SCR reaction process, resulting in a significant enhancement of the catalyst’s low-temperature catalytic activity.
研究领域:
环境科学
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催化化学
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DOI
PubMed
VACUUM
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2025
·
IF 3.9
Junsheng Wen,Boyan Fu,Leyao Bi,Jiahui Lin,Jiaxing Fu,Wenyue Tian,Chunjie Wang,Yue Wang
Recently, the monitoring of TEA has garnered significant attention, particularly concerning food safety, which could potentially lead to health risks. However, current studies on the detection of TEA using tungsten trioxide (WO 3 ) materials are suboptimal and require the exploration of effective WO 3 -based sensitive materials. This work employs a one-step solvothermal method to synthesize Sn-doped WO 3 materials with varying ratios and analyzes their selectivity and sensitivity to gases. The physicochemical properties of materials were characterized using multiple techniques including XRD, SEM, XPS, BET and Raman spectroscopy. The high response to TEA gas is successfully achieved by adjusting the doping amount of Sn 4+ (∼12 wt%). Qualitative analyses indicate that 10 wt% Sn-WO 3 exhibits superior response to TEA in all samples, showcasing a response of 94.5 at 175 °C for 100 ppm TEA, which is 5.7 times higher than that of WO 3 . Also, the related mechanisms were studied in detail. The low-intensity ratio of the (002) facet, small particle size, large specific surface area, and high concentration of oxygen vacancy defects resulting from Sn 4+ doping play pivotal roles in enhancing the response to TEA. It is expected that this work will contribute to advancements in WO 3 -based materials in the field of gas sensing.
研究领域:
材料科学
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化学
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环境监测
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DOI
高影响因子
Catalysis Science & Technology
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2017
·Vol. 7
·期 23
·5540-5549
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IF 5.773
Xinqiang Feng,Chun Shen,Kaiyue Ji,Jiabin Yin,Tianwei Tan
Mesoporous solid acid catalyst WO3/SBA-15 exhibited high performance for the production of bio-based p-xylene (PX). After immobilization on SBA-15, isolated [WO4]2− tetrahedral species which were coordinatively unsaturated, were generated and functioned as Lewis acid centers. The ratio of Lewis to Brønsted acid sites varied in the range of 7.4 to 13.4 by adjusting the calcination temperature. A high ratio of Lewis to Brønsted acid sites and the mesoporous structure contributed to the high activity and stability: a selectivity of 88.0% for PX with a conversion of 64.4% and a carbon balance of 90.1% was achieved over 0.20-WO3/SBA-15-700. Compared with microporous Sn-Beta, the as-prepared catalyst showed better resistance to carbon deposition with a 20% higher yield. The spent catalyst could be easily regenerated by calcination at high temperature. The conversion decreased by 3% and no loss in PX selectivity was observed after five regeneration cycles. The as-prepared WO3/SBA-15 catalyst is highly active, stable and recyclable, and has high potential towards bio-based PX production.
研究领域:
化学工程
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催化科学
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绿色化学
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DOI
高影响因子
Nature Communications
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2022
·Vol. 13
·期 1
·1-10
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IF 17.694
Chen Jiadong,Chen Chunhong,Qin Minkai,Li Ben,Lin Binbin,Mao Qing,Yang Hongbin,Liu Bin,Wang Yong
Noble metal electrocatalysts (e.g., Pt, Ru, etc.) suffer from sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen in alkaline and neutral pH environments. Herein, we found that an integration of Ru nanoparticles (NPs) on oxygen-deficient WO 3-x manifested a 24.0-fold increase in hydrogen evolution reaction (HER) activity compared with commercial Ru/C electrocatalyst in neutral electrolyte. Oxygen-deficient WO 3-x is shown to possess large capacity for storing protons, which could be transferred to the Ru NPs under cathodic potential. This significantly increases the hydrogen coverage on the surface of Ru NPs in HER and thus changes the rate-determining step of HER on Ru from water dissociation to hydrogen recombination.
研究领域:
电化学
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材料科学
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催化
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能源材料
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Chao Zhang,Kaidi Wu,Hanlin Liao,Marc Debliquy
Pristine Bi 2 WO 6 nanosheets and hierarchical WO 3 -Bi 2 WO 6 microflowers were prepared via a facile hydrothermal technique. WO 3 -Bi 2 WO 6 microflowers were assembled with thin nanosheets, where WO 3 nanoparticles were uniformly loaded. The H 2 S sensing properties of pristine Bi 2 WO 6 nanosheets and hierarchical WO 3 -Bi 2 WO 6 microflowers were systematically investigated at room temperature. 20 WO 3 -Bi 2 WO 6 microflowers sensor displayed the best sensing property towards ppb-level H 2 S compared with all other samples. The enhancement was ascribed to the catalytic effect of WO 3 nanoparticles and the modified microstructure with large specific surface areas. Moreover, the n–n heterojunction structures also increase the thickness of electron depletion layer and potential barrier height, which could efficiently improve the sensing properties. The practical application of 20 WO 3 -Bi 2 WO 6 microflowers sensor in detecting the volatiles of Pangasius was also studied in this work. Therefore, the hierarchical WO 3 -Bi 2 WO 6 microflower is a promising ppb-level H 2 S sensing material for environment monitoring and fish freshness detection.
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
Advanced Composites and Hybrid Materials
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2021
·Vol. 4
·期 4
·1330-1342
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IF 5.693
Zhang Fuhao,Cheng Wei,Yu Zhuanghua,Ge Shengsong,Shao Qian,Pan Duo,Liu Bin,Wang Xiaojing,Guo Zhanhu
A novel nanocomposite (WO 3 /UiO-66) was successfully synthesized by the microwave hydrothermal method. The influence of the W:Zr molar ratio on the WO 3 /UiO-66 structure was explored in detail, and the photocatalytic activity of the nanocomposite for photodegradation of rhodamine B (RhB) was evaluated. The WO 3 /UiO-66 with a W:Zr molar ratio of 1:5 (WO 3 /UiO-66–5) exerted the most excellent photocatalytic performance, and the photocatalytic efficiency reached 96.6% after 100 min of simulated sunlight irradiation, thereby showing a higher photocatalytic performance than pure UiO-66 or pure WO 3 . In addition, the stability and reusability of the nanocomposite were studied by cyclic experiments, and the degradation rate of WO 3 /UiO-66–5 still reached 86.6% after 5 cycles. The mechanism underlying the photocatalytic degradation of WO 3 /UiO-66 was finally studied by quenching tests, and the crucial factor in the RhB degradation was hole (h + ), and the existence of the n–n heterojunction also promotes the degradation of RhB by nanocomposites. In this work, an effective method is provided for the preparation of photocatalysts that degrade organic dyes.
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 Environmental Chemical Engineering
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2021
·
IF 5.909
Jie Hu,Xueqing Xiong,Wangwang Guan,Haizhu Long
In this study, a structurally well-designed PdO@WO 3 core–shell, p–n heterojunction architecture was fabricated using a facile hydrothermal method. Its material characterization was performed via X-ray diffractometry, X-ray photoelectron spectroscopy, electron scanning microscopy, and transmission electron microscopy analyses. Besides, the gas sensing properties of pure WO 3 , PdO–WO 3 , and PdO@WO 3 nanocomposites were investigated. By benefiting from the unique synergistic effect between catalytic sensing and p–n heterojunction structure, the PdO@WO 3 core–shell nanostructure showed considerably enhanced acetone sensing performance compared with the other structures; especially, its response toward 50 ppm acetone gas was up to 40, four times higher than that of the pure WO 3 sensor. Its response/recovery times were also significantly reduced and its optimal operating temperature decreased from 250 °C to 200 °C. Finally, the possible sensing mechanism for the proposed PdO@WO 3 core–shell, p–n heterojunction architecture is discussed here; the considerable enhancement in the acetone sensing capability could be attributed to its well-designed fabrication.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2023
·
IF 3.8
Xin Yan,Shuai Zhang,Liangfeng Pan,Tao Ai,Zhuo Li,Yanhui Niu
Improving the separation efficiency of photo-generated charge carriers is an important strategy to enhance the photocatalytic performance. In this paper, the NaNbO 3 /WO 3 composite photocatalyst was prepared via a hydrothermal method , which exhibited a substantial increase in photocatalytic activity through the synergetic effect of visible light irradiation and ultrasound vibration. The XRD, FT-IR, Raman, SEM, XPS , UV–vis DRS, and photoluminescence spectroscopy results indicated that a large number of WO 3 particles were tightly attached to the surface of NaNbO 3 nanowires in the NaNbO 3 /WO 3 composite catalyst. Under the piezo-photocatalysis condition, the degradation efficiency of Rhodamine B (RhB) by 5 % NaNbO 3 /WO 3 was significantly improved, reaching 73.7 % within 120 min. Meanwhile, the piezo-photocatalytic degradation efficiency of the NaNbO 3 /WO 3 composite catalyst was increased by 30.1 % compared to single photocatalysis , and the corresponding reaction rate constant (K) was 2.23 times than that of single photocatalysis. In addition, quenching tests showed that h + was the primary active species in piezo-photocatalytic process. The significant enhancement of piezo-photocatalytic performance was attributed to the piezoelectric field caused by the bending deformation of the NaNbO 3 nanowires, which was an important driving force for photo-generated charge carrier separation. Furthermore, the production of multiple redox active sites simultaneously improved the photocatalytic performance.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Chuanxuan Zhou,Mengyun Wang,Cheng Huang,Fuchao Yang
Real-time and high efficient monitoring of triethylamine (TEA) is crucial for chemical industry production and environmental safety. However, it is still challenge to achieve ppb level detection efficiently and exact understanding. In this paper, bimetallic PtPd sensitized vacancies enriching WO 3 hollow microspheres materials were designed and harvested an ultra-high response and selectivity to TEA gas. It was found that the oxygen vacancies of WO 3 hollow microspheres can be enhanced by the introduction of Fe element. Furthermore, the PtPd@Fe-WO 3 exhibited a remarkable sensing response (409.58–20 ppm TEA), which was 4.85 times higher than that of Fe-WO 3 -based sensor and 21.28 times higher than that of pure WO 3 sensor. This further enhancement of response can be attributed to the strong catalytic spillover effect and electron sensitization of Pt as well as the reversible redox cycling properties of Pd. In addition, the PtPd@Fe-WO 3 material also possesses fast response, excellent selectivity, long-term stability, and a low detection limit of 69.59 ppb, and the gas sensing mechanism was understood by density functional theory (DFT). The proposed bimetallic PtPd sensitized oxygen vacancies enriching WO 3 system is a promising candidate for building high-performance TEA sensors for practical applications.
研究领域:
材料科学
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化学传感器
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环境监测
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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）