JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 7
·4250-4260
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IF 2.2
Zhao Yuan,Jiang Kanrui,Wang Wei,Chen Wenjing,Liu Qiutan,Zhi Guowei
Metal oxide semiconductors have been proven to be a very effective photocatalytic material. In this study, Au-WO 3 was successfully synthesized through a microwave irradiation-assisted one-pot method. The results demonstrated that the hydration degree of WO 3 · n H 2 O could be controlled by Au, and the nanorods could be refined. When the optimum Au modification level was 5.4 wt.%, the specific surface area of WO 3 · n H 2 O increased from 36.67 m 2 g −1 to 71.72 m 2 g −1 , indicating that active sites on the catalyst surface were added. The photocatalytic degradation of rhodamine B (RhB) is considered to assess the photocatalytic performance of the Au-WO 3 nanoparticles under visible light. The deterioration of the sample increased initially, then decreased as the Au level increased. The photocatalytic degradation capacity was strongest when the Au content was 5.4 wt.%, and the degradation rate was 0.0084 min −1 .
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 13
·11336-11344
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IF 2.324
Qiu Zhilei,Tian Xuemin,Li Yan,Zeng Yan,Fan Chao,Wang Mengjun,Hua Zhongqiu
In this paper, WO 3 nanosheets were prepared by an acidification method and Ru catalyst was loaded on the surface of nanosheets through a conventional impregnation process. NH 3 gas sensors based on the neat and Ru-loaded WO 3 nanosheets were fabricated by the scree-printing technique and their sensing properties to NH 3 were investigated. The morphologies and surface structures of neat and Ru-loaded WO 3 nanosheets were analyzed. It is revealed that WO 3 nanosheets have an irregular flake shape and Ru catalyst is found on the surface of nanosheets with an oxided state. It is also found that the sensor response of WO 3 is greatly improved by the loading of Ru. Based on the power-law response of oxygen and TPR results, the sensitization mechanism of Ru is explained. It is proposed that the introduction of Ru promotes the catalytic activity of WO 3 and in turn modulates the reaction route of NH 3 with oxygen adsorbates on the surface, which inhibit the generation of nitrogen oxides and consequently reduces the competitive adsorption with oxygen during the sensor responses.
研究领域:
材料科学
·
化学
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DOI
高影响因子
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
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 45
·15769-15777
·
IF 4.029
Bo Song,Tingting Wang,Honggang Sun,Qian Shao,Junkai Zhao,Kaikai Song,Luhan Hao,Li Wang,Zhanhu Guo
In this study, carbon nanodots (C-dots)/WO3 photocatalysts were prepared via a two-step hydrothermal method. The morphologies and optical properties of the as-prepared materials were investigated. Compared with the prepared WO3 and C-dots, the C-dots/WO3 possessed stronger photocatalytic capability and excellent recyclability for photocatalytic elimination of Rhodamine B. For example, the achieved first order reaction rate constant of 0.01942 min−1 for C-dots/WO3 was ∼7.7 times higher than that of the prepared WO3. The enhanced photocatalytic activity of C-dots/WO3 was attributed to the enhanced light harvesting ability and efficient spatial separation of photo-excited electron–hole pairs resulting from the synergistic effect of WO3 and C-dots. The high photocatalytic activity of C-dots/WO3 remained unchanged even after 3 cycles of use. Meanwhile, a possible mechanism of C-dots/WO3 for the enhanced photocatalytic activity was proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuxiang Hua,Chengyao Hu,Muhammad Arif,Shen-ming Chen,Min Zhang,Xiaoheng Liu
The design of efficient and stable photocatalysts for the removal of heavy metals in the environment has become a research hotspot. Here, a composite photocatalyst with three-dimensional In 2 S 3 microspheres supported by WO 3 nanoparticles was synthesized for the photoreduction of Cr(VI) for the first time. The constructed composite catalyst has a direct Z-scheme electron transport mechanism without any precious metals (Au, Pt, and Ag), quantum dots (TiO 2 QDs) or carbon materials (Graphene) as electronic media. Constructing a direct Z-scheme WO 3 /In 2 S 3 photocatalyst can greatly retain the reduction and oxidation reaction sites on the surface of the heterojunction and accelerate the reduction reaction. Under visible light irradiation, it greatly promotes the photocatalytic reduction of Cr(VI), which is 67.7 times and 3.6 times the reduction rates of WO 3 and In 2 S 3 , respectively. The favorable photocatalytic performance of WO 3 /In 2 S 3 should be attributed to the effective interfacial contact between the semiconductors in the Z-scheme system, thereby realizing effective electron transfer and charge separation. In addition, the stability of WO 3 /In 2 S 3 was studied, and a possible mechanism in the photoreduction process of Cr(VI) was proposed.
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
ChemistrySelect
·
2025
·Vol. 10
·期 13
·e202500943
·
IF 2
Yuzhuo Hu,Chen Wang,Yuying Wang,Huawei Zhou
Graphical The effect of oxygen vacancies in WO 3-x on supercapacitors is currently unclear. In this study, we synthesized WO 3-x with rich oxygen vacancies, as an electrode of supercapacitor. The results imply that oxygen vacancies in WO 3-x make it a promising candidate for supercapacitor applications. The study about the relationship between micro-nano structure and performance in supercapacitors is important. Oxygen vacancies are prevalent in tungsten oxide. The effect of oxygen vacancies in WO 3-x on supercapacitors is currently unclear. In this study, we synthesized WO 3-x , an electrode material with rich oxygen vacancies, using a solvothermal-calcination method. The micro-nano structures of WO 3-x was characterized using SEM, EDS, XRD, FTIR, XPS, and UV–vis absorption spectrum, WO 3 serving as a comparative control. The above structural characterization demonstrated that there are more oxygen vacancies in WO 3-x than WO 3 . The electrochemical performance of the WO 3-x electrode was assessed through both three-electrode and asymmetric supercapacitors (ASCs). The results of CV and EIS indicate that better capacitance performance comes from more electron transport (larger current in CV) and faster electron transport (smaller R ct in EIS). The GCD tests show that WO 3-x has a greater specific capacitance (35.03 F g −1 ) than WO 3 (19.76 F g −1 ) at a current density of 0.1 A g −1 across a potential range of 0.0 to 3.5 V. Additionally, WO 3-x ASC displays superior cycling stability, maintaining 69.07% of its initial specific capacitance over 10,000 cycles at 0.5 A g −1 . These results imply that oxygen vacancies in WO 3-x make it a promising candidate for supercapacitor applications.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shang Xu,Dingfa Fu,Kai Song,Lin Wang,Zuobao Yang,Weiyou Yang,Huilin Hou
In the present work, we reported the exploration of WO 3 /BiVO 4 heterojunction photoanodes, which were consisted of one-dimensional WO 3 nanofiber (1D-WO 3 ) cores and BiVO 4 film shells. The 1D-WO 3 nanofibers were prepared by electrospinning, and the BiVO 4 outlayers were subsequently deposited around the surface of 1D-WO 3 fibers via a solution immersion process, leading to the construction of 1D-WO 3 /BiVO 4 heterojunctions. They had a maximum photocurrent density of 2.8 mA cm −2 at 1.23 V vs. RHE under AM 1.5 simulated solar light illumination, which was ∼20 times to that of pure 1D-WO 3 counterparts ( i.e. , 0.15 mA cm −2 ), and comparable to the best one of photoanodes based on WO 3 /BiVO 4 hybrids ever reported. Furthermore, the onset potential of FTO/1D-WO 3 /BiVO 4 photoanode was subsequently reduced, and the maximum incident photon-to-current efficiency ( IPCE ) was enhanced for ∼4 times in comparison to that of 1D-WO 3 counterparts. The mechanism for the enhanced PEC behaviors of WO 3 /BiVO 4 heterojunction photoanodes was proposed.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaozan Zhang,Fei Wu,Qiuju Zhang,Zhiyi Lu,Yueqing Zheng,Yin’an Zhu,Yichao Lin
Developing catalysts with high catalytic activity and stability in acidic media is crucial for advancing hydrogen production in proton exchange membrane water electrolyzers (PEMWEs). To this end, a self-supported WO3@RuO2 nanowire structure was grown in situ on a titanium mesh using hydrothermal and ion-exchange methods. Despite a Ru loading of only 0.098 wt %, it achieves an overpotential of 246 mV for the oxygen evolution reaction (OER) at a current density of 10 mA·cm–2 in acidic 0.5 M H2SO4 while maintaining excellent stability over 50 h, much better than that of the commercial RuO2. After the establishment of the WO3@RuO2 heterostructure, a reduced overpotential of the rate-determining step from M–O* to M–OOH* is confirmed by the DFT calculation. Meanwhile, its enhanced OER kinetics are also greatly improved by this self-supported system in the absence of the organic binder, leading to a reduced interface resistance between active sites and electrolytes. This work presents a promising approach to minimize the use of noble metals for large-scale PEMWE applications.
研究领域:
材料科学
·
电催化
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可再生能源
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产品关联
DOI
PubMed
高影响因子
Crystals
·
2022
·Vol. 12
·期 2
·190
·
IF 2.67
Lihong Jia,Wansen Ma,Qianyu Zhuang,Yani Zhang,Jie Dang
Metal ion modification is considered to be an effective way to construct metal oxides with specific physical and chemical properties. In this paper, we prepare a tungsten oxide (WO3) film co-modified by Co-ion and Mo-ion to serve as the electrochromic material through a one-step electrodeposition method. The effect of electrodeposition time on film thickness, surface morphology and electrochromic properties is systematically studied as well. The results show that, compared with pure WO3film, the surface morphology of the tungsten oxide film modified by Co-ion and Mo-ion (WO3: Co, Mo) is significantly different. The Co and Mo co-modified film possesses a higher transmission modulation (58.5% at 600 nm) and rapid switching speed (coloring and bleaching time are 2.7 s and 5.6 s, respectively), low impedance value and excellent cycle stability. The performance enhancement is mainly attributed to the coral-like structure of the membrane, which provides a larger specific surface area, more ion adsorption sites and faster ion diffusion. Therefore, this work provides a fast and low-cost method to prepare tungsten oxide electrochromic films co-modified with cobalt and molybdenum ions. At the same time, it also provides an idea to obtain films with different electrochromic properties by adjusting the film thickness.Keywords:electrochromic;metal ion modification;structure;WO3film
研究领域:
材料科学
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电化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Yi Zheng,Gang Chen,Yaoguang Yu,Yansong Zhou,Fang He
A carbon doping method is developed to overcome the drawback of conventional carbon doping method. The carbon dopant is synthesized by treating carbon with dilute nitric acid through hydrothermal process. Carbon-doped WO 3 ·0.33H 2 O (C WO 3 ·0.33H 2 O) is obtained by adding the carbon dopant solution, and then through an additional hydrothermal process. Based on XRD, Raman and XPS, carbon have been incorporated into the interstitial position of WO 3 ·0.33H 2 O unit cell rather than substitution of oxygen in lattice of WO 3 ·0.33H 2 O, which induces distortion of WO 6 octahedron and lattice defect. In addition, carbon doping also induces the emergence of new level above the valence band. The new level increases the migration pathway of photo-generated carriers, which reduces the recombination rate of photo-generated carriers. The changes of band structure, distortion of WO 6 octahedron and lattice defect are beneficial to improve the photocatalytic performance of WO 3 ·0.33H 2 O. Compared with pristine WO 3 ·0.33H 2 O, C WO 3 ·0.33H 2 O display better photocatalytic performance on degradation of rhodamine B (RhB), which include the faster de-ethylation process and cycloreversion process. Moreover, the experiments of radical quenchers confirmed that the h + display the main influence on degradation of RhB. This study implies that carbon can be doped into some metal oxide hydrates through a mild preparation process, which provides a possible way for the synthesis of carbon doped thermal unstable materials.
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
Molecular Catalysis
·
2020
·
IF 3.687
Yangyang Fang,Jun Li,Na Sheng,Xiaozhong Wang,Di Chen,Menglu Cai,Yu An,Yingqi Chen,Liyan Dai
A series of MoW-doped MCM-41 catalysts were prepared for the selective oxidation of anthracene to high value-added anthraquinone. Although anthraquinone production has been progressively industrialized, the anthracene oxidation still faces the problems of poor solubility of reactants and low anthracene conversion, particularly when employing supported catalysts in solution media. We herein reported a challenging but crucial method for anthraquinone production by using anthracene, H 2 O 2 and Mo 1 W 2 -MCM-41 catalyst in HOAc under mild reaction conditions. In addition, experimental and theoretical results revealed that the synergistic effect between Mo, W and MCM-41 species contributes to an enchanced cataltic activity with conversion up to 97.6 %. The highly active H 2 O 2 -MCM-41 catalyst can be used for several cycles without obvious activity loss and serve as a promising candidate for anthraquinone as well as its derivatives production, making it a good alternative for various oxidation reactions.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Qi Zhao,Yasi Fang,Ke Qiao,Wei Wei,Yongji Yao,Yanfeng Gao
Electrochromic smart devices with controllable optical property are the most promising alternative to traditional windows and curtains. State of the art preparation and commercialization of large-scale electrochromic films are mainly based on vapor phase deposition , but massive application is limited by high price (due to complex preparation process). Here, an all-solution technology is developed for large-area low-cost preparation of electrochromic films. A WO 3 /ITO dispersion was successfully developed; high electrical conductivity ITO nanoparticle networks along with ITO coating on glass can serve as extended 3-dimensional electrode, which can form microelectrical field and act as the pathways for electron diffusion to WO 3 nanorods . In fact, experiment results show that the surface resistance of WO 3 /ITO nanocomposite film decreased to 32% of the pure WO 3 . In other words, the optimum WO 3 /ITO nanocomposite films in this study with “distributed conductive structure” and submicrometer-sized voids morphology have improved the electrochromic properties remarkably. Our optimized WO 3 /ITO films exhibit higher optical modulation than pristine WO 3 (ΔT = 81.7% vs 62.5% at 630 nm) and a faster switching speed (t b = 6 s vs 22 s).
研究领域:
材料科学
·
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）