JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 11
·15242-15250
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IF 2.478
Guo Xiaogang,Liang Taotao,Bao Hebin,Yuan Chengsong,Lai Chuan,Tang Chuyue,Giwa A. S.
The fabrication of functional nanocomposite films by electrically driven techniques is an emerging method that has attracted increasing research interest because of advantages such as easy operation, low-cost, no secondary pollution. In this study, electrophoretic assembly technique (EAT) was firstly developed to design the promising novel nano-aluminum@tungsten trioxide (nano-Al@WO 3 ) energetic coating with even distribution of nanoparticles under room temperature and pressure conditions, using the mixed liquor of isopropyl alcohol, PEG-1000, and polyethyleneimine as the optimal dispersion liquid for EAT. High crystallinity and purity of product was demonstrated by X-ray diffractometer. Differential scanning calorimetry (DSC) results that the obtained Al@WO 3 was an outstanding high-energy coating with a high output of heat (~ 2400 J/g) due to the sufficient thermite reaction between nano-Al and WO 3 particles, and the heat-release process of product can be highly controlled by adjusting the solid loading concentration ratio of nano-Al@WO 3 before EAT. Thus, the fabrication method of EAT proposed here has great potentials to high-efficient construction or design of various energetic nanocomposite coatings such as thermite and bimetallic reactive composites with wide applications.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xuesong Liu,Peng Jiang,Yong Chen,Yaoguang Wang,Qiaoling Ding,Zhiming Sui,Hongfeng Chen,Zhongyun Shen,Xiaodong Wu
Two Ce-W-Ti mixed oxide catalysts were prepared by wet impregnation (CeW/Ti-I) and mechanical mixing (Ce/W/Ti-M) methods. CeW/Ti-I catalyst exhibits over 80% NO x conversion and nearly 100% N 2 selectivity at 200–550 °C. The superior catalytic performance is associated with the high dispersion of active CeO 2 and acidic WO 3 on TiO 2 and the synergistic effects among different components. The X-ray Diffraction, Raman spectroscopy, Nitrogen physisorption, X-ray photoelectron spectroscopy, H 2 temperature-programmed reduction, temperature-programmed desorption of ammonia and infrared spectroscopy were performed. It is found that the formation of solid solutions, as well as the high specific surface area, would increase the amounts of Ce 3+ , oxygen vacancies and acid sites in the catalyst. These broaden the operating temperature window of NH 3 -SCR reaction and enhance the N 2 selectivity by facilitating “fast SCR” reaction at low temperatures and inhibiting the unselective oxidation of NH 3 at high temperatures.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Dingqiong Wei,Yao Ding,Zhaohui Li
To fabricate an efficient two-component Z-scheme system for visible light induced overall water splitting, CdS/WO 3 nanocomposites , with cubic CdS nanoparticles grown on the surface of hexagonal WO 3 nanorods , were prepared via a facile precipitation of Cd 2+ with S 2− in the presence of pre-obtained hexagonal WO 3 nanorods. MnO 2 and MoS 2 , the co-catalysts for O 2 and H 2 generation respectively, were selectively deposited on WO 3 and CdS in the CdS/WO 3 nanocomposites. The resultant MoS 2 –CdS/WO 3 –MnO 2 composites show photocatalytic activity for overall water splitting under visible light, with an optimized performance observed over 2.0%MoS 2 -0.2 CdS/WO 3 -1.0%MnO 2 . The visible light induced overall water splitting over MoS 2 –CdS/WO 3 –MnO 2 nanocomposites can be attributed to the presence of a Z-scheme charge transfer pathway in the CdS/WO 3 nanocomposites, ie, the transfer of the photo-generated electrons from the CB of WO 3 to the VB of CdS to recombine with the photo-generated holes through an efficient interface between cubic CdS and hexagonal WO 3 . The left photo-generated holes in VB of WO 3 and the photo-generated electrons in CB of CdS therefore can accomplish the water oxidation and water reduction simultaneously, with the assistance of the surface deposited cocatalysts (MnO 2 and MoS 2 ). This work demonstrated the great potential of fabricating the two-component direct Z-scheme photocatalytic systems for overall water splitting from two semiconductors with a staggered band structure .
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yao He,Aiqin Liang,Danhua Zhu,Meihua Hu,Liming Xu,Shixing Chao,Weiqiang Zhou,Yanli Wu,Jingkun Xu,Feng Zhao
Although WO 3 with high theoretical capacitance has a future in the field of energy storage, its electrode processing to obtain high capacitance is still a challenge. Here, we propose an innovative electrode structure design by utilizing PEDOT and PEDOT:PSS to sequentially assemble with the oxygen vacancies-enriched WO 3 and WO 3 -CeO 2 hybrid nanowires on the glassy carbon (GC). As-prepared PEDOT:PSS/WO 3 /PEDOT/GC and PEDOT:PSS/WO 3 -CeO 2 /PEDOT/GC electrodes show high areal capacitance of 1139.6 and 1310 mF cm −2 at 2 mA cm −2 , respectively, greater than 822.3 mF cm −2 of the WO 3 -PTFE-C/GC. The asymmetric supercapacitor based on PEDOT:PSS/WO 3 -CeO 2 /PEDOT and PEDOT:PSS/RuO 2 /PEDOT electrodes works at 1.6 V high working voltage, delivers an energy density of 0.61 Wh m −2 at power density of 8.22 W m −2 . Therefore, the electrode structure design will be suitable to improve the capacitance performance of other low-conductivity active materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Rui Guo
The metastable α-Ag 2 MoO 4 was usually prepared under high pressure conditions, but it was successfully prepared by epitaxial growth on WO 3 nanosheets at room temperature under normal pressure in this work. The interfacial structure of α-Ag 2 MoO 4 /WO 3 (AW) was characterized by XRD , SEM, TEM, and Raman spectra to explain the process of phase transformation from the β phase to the α phase. The photocatalytic activities were evaluated by the degradation of methylene blue and Escherichia coli . The results indicate that AW-60 exhibits the best photocatalytic activity. The enhancement in photocatalytic performance is mainly due to the photogenerated electron flow between the components from WO 3 to Ag 2 MoO 4 in AW-60. The initial inactivation of E. coli is due to the decomposition of macromolecules with a typical mass range m / z of 2–7 kDa. The corresponding photocatalytic mechanism was proposed and confirmed by the measurements, such as BET, fluorescence spectrum, free radical trapping and the ζ potential of WO 3 and AW-60.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Bihong Zhang,Hao Wang,Jiajia Xi,Faqiong Zhao,Baizhao Zeng
A novel three-dimensional (3D) ZnIn 2 S 4 /WO 3 (ZIS/WO 3 ) photocatalyst is prepared via a simple hydrothermal method and used as photoanode material in constructing photoelectrochemical (PEC) immunosensor of prostate specific antigen (PSA). The photocatalyst presents high activity, and its photocurrent intensity is up to 23 and 7 times of WO 3 and ZnIn 2 S 4 (ZIS) respectively, under 430 nm light illumination. The improved PEC behavior is due to the sensitization and 3D structure of ZIS and the formation of Z-scheme heterojunction between ZIS and WO 3 , which greatly enhance light harvesting, promote the spatial separation of interfacial charges and prolong the lifetime of photogenerated electrons. At the same time, the high oxidation capacity of valence band holes of WO 3 is retained. A label-free PEC immunosensor is fabricated by using the photocatalyst, and it shows good performance for PSA detection. The linear response range is 0.01–500 ng/mL, and the detection limit is low to 5 pg/mL. Moreover, the PEC immunosensor afforded high stability, specificity and reproducibility. Therefore, it possesses great application potential in biological/clinical analysis.
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APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Sijie Xie,Zhijie Bi,Yongbo Chen,Xiaoli He,Xiangxin Guo,Xiangdong Gao,Xiaomin Li
Amorphous Mo-doped WO 3 films are successfully synthesized via an electrodeposition method. In comparison with the reported time-consuming and costly techniques involving heating or vacuuming steps, the proposed electrodeposition method achieves the preparation of Mo-doped WO 3 in a simple and economic all-solution route. By optimizing the dopant concentration of Mo, the as-prepared 2 at% Mo-doped WO 3 film exhibits excellent electrochromic and energy-storage properties with large optical modulation of 83.3% at 633 nm and high pseudocapacitance of 117.1 mF cm −2 (334.6 mF g −1 ), greatly superior to those of pure WO 3 films. These great electrochemical properties could be attributed to the amorphous state and the proper structure distortion caused by doped atoms. Furthermore, bifunctional devices on various substrates contained the 2 at% Mo-doped WO 3 films are demonstrated with satisfactory electrochromic and energy-storage properties as well, indicating the practical applications of the Mo-doped WO 3 films in both energy-saving and energy-storage fields.
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CHEMOSPHERE
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2019
·
IF 5.108
He Guo,Nan Jiang,Huijuan Wang,Kefeng Shang,Na Lu,Jie Li,Yan Wu
Pulsed discharge plasma (PDP) was adopted to induce WO 3 for synergetic degradation of ciprofloxacin (CIP) in water. WO 3 was firstly characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), UV–Vis diffuse reflectance spectroscopy (DRS), Photocurrents and Photoluminescence . The degradation results showed that PDP could induce WO 3 photocatalysis successfully, and a synergetic effect was established in PDP/WO 3 system. After 60 min treatment time, 0.16 g/L WO 3 increased the CIP removal from 71.3% to 99.6%, with the enhancement of the first-order kinetic constant from 0.020 min −1 to 0.081 min −1 . Then, the effect of peak voltage, air flow rate and pH on CIP removal was evaluated. Active species trapping test verified that ·OH and ·O 2 − played the major role for plasma-degradation of CIP degradation, whereas OH and h + were conductive to catalytic degrade CIP. WO 3 addition lead to the decline of O 3 and enhancement of OH no matter in deionized water or CIP solution. The degradation process was explored using fluorescence spectrograph , liquid chromatography-mass spectrometry (LC-MS) and ion chromatography (IC). Finally, the possible degradation pathways of CIP degradation were proposed. The reuse test suggested WO 3 possessed excellent catalytic performance as well as good stability.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Li Cao,Xiaodong Wu,Ze Chen,Yue Ma,Ziran Ma,Rui Ran,Zhichun Si,Duan Weng,Baodong Wang
CeO 2 /WO 3 -TiO 2 (CeWTi) and Nb 2 O 5 -CeO 2 /WO 3 -TiO 2 (NbCeWTi) catalysts were prepared by a sol-gel precipitation method. Both the catalysts exhibit high selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) activities at 270–500 °C. The sulfur tolerances of the catalysts were evaluated at 270 °C by adding H 2 O and SO 2 in the feeding gas and NbCeWTi exhibited a significantly improved resistance. The thermogravimetric (TG) and mass spectrographic (MS) results indicated that much less sulfates formed on NbCeWTi and existed mainly in the form of ammonium hydrogen sulfate species which protected Ce x+ active sites effectively from attacking of SO 2 . According to the results of temperature-programmed desorption of ammonia (NH 3 -TPD), H 2 temperature-programmed reduction (H 2 -TPR) and SO 2 oxidation , loading niobia on CeWTi inhibited the SO 2 oxidative adsorption and SO 3 production which basically reduced sulfur poisoning of the catalyst. Additionally, the niobia modification ensured the formation of nitrates from the competitive adsorption of SO 2 and hereby facilitated the nitrate SCR route based on the in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS).
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 23
·15927-15938
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IF 2.993
Xun Suhang,Hou Caozheng,Li Hongping,He Minqiang,Ma Ruliang,Zhang Ming,Zhu Wenshuai,Li Huaming
The catalyst of WO 3 highly dispersed on mesoporous ZrO 2 was prepared by hydrothermal treatment and calcination. Ionic liquid templates with different cations and various calcination temperatures were taken into account to investigate factors that affect the structure of the catalysts. Wide-angle XRD, Raman, low-angle XRD, N 2 adsorption–desorption, SEM, EDS-mapping and TEM analyses were employed to characterize the composition, morphology and the dispersion of WO 3 . It was found that [C 16 H 33 N(CH 3 ) 3 ] 4 SiW 12 O 40 and 700 °C were the optimal ionic liquid template and calcination temperature; the obtained catalyst, expressed as 700-C 16 -WO 3 /ZrO 2 , exhibited the best catalytic activity in oxidation desulfurization. Dibenzothiophene (DBT) in the model oil could be oxidized to DBT sulfone (DBTO 2 ) completely, certified by GC-MS analysis, under optimum conditions. The oxidative desulfurization efficiencies of different substrates catalyze by 700-C 16 -WO 3 /ZrO 2 , and the cycle performance on the oxidation of DBT were studied.
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高影响因子
MATERIALS LETTERS
·
2014
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IF 2.269
Qingfei Wu,Jing Huang,Hua Li
Porous nanostructured WO 3 coatings were deposited by two routes, solution and suspension plasma spraying. The nanostructural characteristics of the coatings were tunable by adjusting the constituents of the starting liquid precursor and spray parameters. Planar or spherical WO 3 grains with controllable sizes in nano-scale have been fabricated. Complete formation of spherical WO 3 grains was attained during solution plasma spraying. Enhanced heating of the nano-WO 3 particles by augmenting plasma power gave rise to oriented WO 3 grain growth along (0 0 2) plane. The planar WO 3 grains with the dimension of ~50 nm, ~80 nm, and ~700 nm in thickness, width, and length respectively were fabricated by the suspension plasma spraying. The results provide clear insight into potential gas-sensing applications of the porous WO 3 coatings.
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高影响因子
FUEL
·
2015
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IF 3.52
Hao Wang,Zhenyu Yao,Xuchun Zhan,Yan Wu,Min Li
A microwave hydrothermal (MWH) method was used to deposit WO 3 onto ZrO 2 –Al 2 O 3 with various ZrO 2 contents to prepare hydrodesulfurization (HDS) catalysts with high WO 3 loading (23 wt%) close to industrial hydrotreating, for achieving high W dispersion and weak W-support interaction. The catalysts with the same WO 3 and ZrO 2 contents were prepared by a conventional impregnation (IM) method as reference. The effects of catalyst preparation methods and ZrO 2 contents on the catalyst property and dibenzothiophene HDS activity were investigated. The results show that the MWH method leads to highly dispersed octahedrally coordinated W species which are weakly linked on ZrO 2 –Al 2 O 3 and easy to be reduced; no bulk WO 3 crystallites are observed even at high ZrO 2 content (50 wt%). Therefore, it causes better sulfidation and shorter WS 2 slabs. Contrarily, the IM method induces W species to agglomerate into bulk WO 3 crystallites which are poorly dispersed and hard to be reduced, which is further aggravated by ZrO 2 . The HDS activity of the MWH-prepared catalysts significantly increases with ZrO 2 up to 40 wt% ZrO 2 . This catalyst shows 2 times higher rate constant and 1.64 times higher efficiency of HDS than the IM-prepared catalyst with the same ZrO 2 content. For the IM-prepared catalysts, the HDS activity slightly increases at small amount of ZrO 2 (10 wt%) and then decreases drastically.
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