APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jun Feng,Tao Jiang,Yingchun Han,Otieno Kevin Okoth,Ling Cheng,Jingdong Zhang
A dual Z-scheme Bi 2 S 3 /Bi 2 O 3 /WO 3 ternary film was constructed via a controllable reduction of peroxotungstate by ethanol, calcination of Bi (NO 3 ) 3 and in situ anion exchange of Bi 2 O 3 with sulfide. The as-prepared composite film was characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The UV–visible diffuse reflectance spectroscopic and photoluminescence studies indicated that the introduction of Bi 2 S 3 in Bi 2 O 3 /WO 3 film effectively improved the absorption of the film in the visible region and suppressed the recombination of photogenerated carriers. The photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was evaluated by decoloration of Rhodamine B under visible light illumination. Compared with WO 3 and Bi 2 O 3 /WO 3 films, the Bi 2 S 3 /Bi 2 O 3 /WO 3 film exhibited much higher degradation efficiency. Moreover, the enhanced visible light photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was also demonstrated by efficient degradation of diclofenac. According to the reactive oxygen species detected by electron spin resonance, a dual Z-scheme system formed in the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was proposed, which offered a new approach to the construction of semiconducting composite film with high photoelectrocatalytic performance for pollutant removal.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Man Zhang,Changzhu Yang,Wenhong Pu,Yuanbin Tan,Kun Yang,Jingdong Zhang
ABSTRACT The heterojunction films of WO 3 /TiO 2 were prepared by liquid phase deposition (LPD) method via two-step processes. The scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopic analysis indicated that flower-like WO 3 film was successfully deposited on TiO 2 film with the LPD processes. The TiO 2 film provided an excellent platform for WO 3 deposition while WO 3 obviously expanded the absorption of TiO 2 film to visible light. As the result, the heterojunction film of WO 3 /TiO 2 exhibited higher photocurrent response to visible light illumination than pure TiO 2 or WO 3 film. The photoelectrocatalytic (PEC) activity of WO 3 /TiO 2 film was evaluated by degrading Rhodamin B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation. The results showed that the LPD WO 3 /TiO 2 film possessed high PEC activity for efficient removal of various refractory organic pollutants.
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Dinghua Zhou,Min He,Yunxuan Ding,Jiaguo Yu,Ke Fan,Licheng Sun
Precious metals (like Ir, Ru, and Pt) and their derivatives are the benchmark catalysts for water splitting in acidic media due to their high stability and activity. However, the high cost and scarcity of these materials hamper the large-scale applications. To solve this issue, construction of catalysts containing low content of precious metals with high intrinsic activity can be an efficient strategy, which expectedly can decrease the cost but meanwhile preserve the activity. Herein, we synthesized an IrW/WO3 array catalyst by in situ formation of IrW alloy on hierarchical WO3 nanosheet arrays. With extremely low Ir content of 1.25 wt % in 0.5 M H2SO4, this composite catalyst not only shows superior water oxidation activity (the overpotential at 10 mA cm–2 is only 229 mV, significantly lower than that of the commercial IrO2 (358 mV)) but also exhibits excellent proton reduction performance (the overpotential at −10 mA cm–2 is 49 mV, close to that of commercial Pt/C catalyst (42 mV)), showing promising bifunctionality for the overall water splitting. As a result, only 1.5 V is needed to drive the overall water splitting at 10 mA cm–2 with a good long-term stability under acidic conditions. These remarkable features can be ascribed to the abundant active sites exposed by the three-dimensional nanostructure, and the high intrinsic activity per Ir site. The theoretical calculation verifies that Ir sites in IrW surface after oxidation have a higher intrinsic activity than IrO2 for water oxidation. We believe this research can supply a strategy to design highly active and stable catalysts with low loading of noble metals for acidic water splitting.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lixia Yang,Zhenglin Chen,Tianzhu Ma,Shuqu Zhang,Weili Dai,Xiao Xiao,Xubiao Luo,Jianping Zou,Xinman Tu,Liming Yang,Shenglian Luo
Complete dehalogenation of florfenicol (FLO) was realized on a self-supporting, electrochromic WO 3 nanocluster electrocatalyst prepared by anodization, effectively inhibiting the generation of toxic intermediates that can pose harmful influence on the ecosystem. Three dimensional, omnidirectional WO 3 clusters made up of WO 3 nanoflakes are grown from a W mesh substrate, which can work as catalyst and electrode enable the complete dehalogenation via a direct electron transfer because of the inherent electron-storage and self-supporting nature. Assisted by bias potential, continuous electron streams are generated and reserved in the porous WO 3 interface, building an electron-rich circumstance for activating the C–Cl and C–F bonds to detach the halogen groups. The best electrocatalytic dehalogenation performance, 99.7% in 120 min was acquired using the optimal WO 3 /W anodized at 25 V. The possible sites attacked by electrons is predicted by Fukui index, that is evidenced by the MS of intermediates originated from FLO decomposition. ECOSAR simulation and E. coli surviving evaluation verifies that there is no hazard on ecosystem of the chemicals without –F and –Cl. Particularly, the self-supporting WO 3 nanocluster electrocatalyst exhibits a superior durability with no decay in activity after 20 h running, indicating a promising prospect in establishing a feasible, cost-effective, and durable electrochemical strategy for antibiotic dehalogenation.
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Wei Li,Xuesen Du,Zhi Li,Yaqin Tao,Jingyu Xue,Yanrong Chen,Zhongqing Yang,Jingyu Ran,Vladislav Rac,Vesna Rakić
Vanadia-based catalysts are widely used in selective catalytic reduction (SCR) reaction for reducing nitrogen oxides emissions, however, they only exhibit sufficient DeNO x efficiency within a narrow temperature window. In this study, a catalyst embedded with electrothermal alloy was prepared. The catalyst surface temperature could be heated using the electrothermal alloy, in order to widen the operating temperature window of the V 2 O 5 -WO 3 /TiO 2 catalyst. Experimental results revealed that the electrothermal alloy embedded V 2 O 5 -WO 3 /TiO 2 catalyst can maintain superior NH 3 -SCR performance and high resistance to H 2 O in a wide gas temperature range of 100–400 °C by controlling the surface temperature. In the meantime, the NH 4 HSO 4 poisoned catalyst could be efficiently regenerated through electric heating, and NO x conversion can be restored to the level of fresh samples. Additionally, the effect of additives including methylcellulose and glass fiber , on the physicochemical properties of the plate-type catalyst was also investigated, and the catalyst samples were characterized by means of BET, XRD , NH 3 -TPD, H 2 -TPR, TG and SEM-EDS. This study proves the electric heating strategy is a promising way to enhance the performance of the V 2 O 5 -WO 3 /TiO 2 during wide temperature SCR applications.
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 43
·434005
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IF 3.409
Yang Li,Yue Lu,Xiaofang Jia,Zhaoyu Ma,Junying Zhang
Graphitic carbon nitride (g-C3N4) is a photocatalytic semiconductor with great potential for application, whereas, its photocatalytic activity is limited by the high re-combination rate of photo-generated electrons and holes. Here, we load two-dimensional (2D) WO3 nanosheets on the surface of one-dimensional (1D) g-C3N4 porous nanotubes to form a Z-scheme heterojunction. The built-in electric field at the interface of the heterojunction is conducive to promoting electrons transfer from the conduction band of WO3 to the valence band of g-C3N4 and therein combine with the holes. This inhibits electron–hole re-combination in g-C3N4 and WO3, and thus retains the high redox potential of the photo-generated charge-carriers. Therefore, the 2D/1D WO3/g-C3N4 heterojunction shows excellent photocatalytic hydrogen production and Rhodamine B degradation activities. Under simulated sunlight, photocatalytic hydrogen production rate of the WO3/g-C3N4 heterojunction reaches 7.78 mmol g−1 h−1, 2.7 times that of the single g-C3N4 porous nanotubes.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Shifu Chen,Yingfei Hu,Sugang Meng,Xianliang Fu
The separation mechanisms of photogenerated electrons and holes for composite photocatalysts have been a research focus. In this paper, the composite g-C 3 N 4 -WO 3 photocatalysts with different main parts of C 3 N 4 or WO 3 were prepared by ball milling and heat treatment methods. The photocatalytic performance was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) methods. The separation mechanisms of photogenerated electrons and holes of the g-C 3 N 4 -WO 3 photocatalysts were investigated by electron spin resonance technology (ESR), photoluminescence technique (PL), and determination of reactive species in the photocatalytic reactions. When the main part of the g-C 3 N 4 -WO 3 photocatalyst is WO 3 (namely g-C 3 N 4 /WO 3 ), the transport process of the photogenerated electrons and holes adopts the generic band–band transfer. Meanwhile, g-C 3 N 4 is covered by WO 3 powder, and the role of g-C 3 N 4 can not be played fully. The photocatalytic activity of the photocatalyst is not obviously increased. However, when the primary part of the WO 3 -g-C 3 N 4 photocatalyst is g-C 3 N 4 (namely WO 3 /g-C 3 N 4 ), the migration of photogenerated electrons and holes exhibits a typical characteristic of Z-scheme photocatalyst, and the photocatalytic activity of the photocatalyst is increased greatly.
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DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2200054
·
IF 1.599
Xinjun Wang,Bian Li,Fang Xu,Dapeng Wu,Yuqin Jiang,Wei Li,Kai Jiang
The composite photocatalyst composed of WO 3 and Bi 2 WO 6 can play the synergistic effect between the two individual components. Herein, a WO 3 /Bi 2 WO 6 heterogeneous material with high quality interface has been synthesized via situ growing Bi 2 WO 6 directly on the surface of WO 3 nanoplates. The photocatalytic degradation efficiency of tetracycline (TC) for BWO-3 reaches ≈92%, which is much higher than that of WO 3 (≈27%) due to the coupling effect of WO 3 and Bi 2 WO 6 . Electrochemical impedance and photocurrent measurements prove that WO 3 /Bi 2 WO 6 heterogeneous material has decreased carriers’ transfer resistance and higher photocurrent density, which endows its improved photocatalytic performance. Also, the radical trapping experiment proves that superoxide radical has great impacts on the degradation of TC. This work provides an efficient method for developing photocatalysts with excellent performance.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xuanwen Liu,Juanjuan Xu,Zhiyuan Ni,Renchao Wang,Junhua You,Rui Guo
The debated photocatalytic mechanism in the photocatalyst composite Ag 3 PO 4 /WO 3 is explored by analyzing the electron flow direction between Ag 3 PO 4 and WO 3 . Cubic phase WO 3 nanosheets with a thickness of 10–20 nm are prepared using the sintering method at 200 °C and decorated by cubic Ag 3 PO 4 particles using a practical deposition-precipitation method. Pure WO 3 shows a strong adsorption activity for rhodamine B (RhB) and methylene blue (MB), but no adsorption activity for methyl orange (MO) and it shows no photocatalytic activity on these three dye molecules. Pure Ag 3 PO 4 has no adsorption activity on RhB but shows a strong photocatalytic activity on RhB under visible light irradiation. As-prepared AW-x composites with different weight ratios show no adsorption activity but a high photocatalytic activity. However, after heat-treatment at 200 °C for 24 h, the composite catalysts show both a strong adsorption and photocatalytic activities on RhB. The results provide an indirect evidence that the electron flow direction is from WO 3 to Ag 3 PO 4 , which thus supports the Z-scheme photocatalytic mechanism.
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Junhua Hu,Lijie Wang,Peng Zhang,Changhao Liang,Guosheng Shao
Carbon-layer-coated TiO 2 /WO 3 nanofibers (WTC) were fabricated by combining the electrospinning technique (for TiO 2 /WO 3 nanofibers) and hydrothermal method (for carbon shell). The structure characterization results showed that TiO 2 /WO 3 nanofibers (WT) were encased within an uniform carbon shell about 10 nm in thickness. By adjusting the content of WO 3 , the graphitization degree of carbon layer could be controlled, and the WTC nanofibers had remarkable light absorption in the visible region. Furthermore, the photoelectrochemical performance and photocatalytic activity were investigated systematically. As expected, the H 2 -generation rate of the as-prepared composite materials was greatly enhanced compared with pure TiO 2 nanofibers (TNFs), TiO 2 /WO 3 nanofibers (WT) and TiO 2 @carbon core/shell nanofibers (TC). The enhanced activities were mainly attributed to the multichannel-improved charge-carrier photosynthetic heterojunction system with the carbon layer on the surface of TiO 2 as an electron collector and WO 3 as a hole collector, leading to effective charge separation on these components, which were evidenced by photoluminescence spectroscopy (PL), electrochemical impedance spectroscopy (EIS) and photocurrent analysis. Besides, the addition of WO 3 promoted the graphitization of carbon layer, which in turn improved transport of electrons in the carbon layer and also contributed to the performance improvement.
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DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Zhanzhi Ge,Yuesong Shen,Sasa Gu
The catalyst for selective catalytic reduction of NO x at high temperatures is significantly demanded by current gas-fired exhaust purification. In this work, the complex oxides composed of two different structures of ZrO 2 -WO 3 and WO 3 /ZrO 2 with zirconium as the main component were prepared for NH 3 -SCR of NO at high temperatures by blending method and equal volume impregnation method, respectively. Combined with XRD, NH 3 -TPD, FE-SEM, BET and in situ DRIFTS characterization, the effects of component optimization of two kinds of ZrO 2 and WO 3 complex oxides on the performance for NH 3 -SCR of NO were mainly studied. The optimal compatibility of ZrO 2 and WO 3 complex oxides was determined, and the corresponding N 2 selectivity and anti-interference ability of water vapor and SO 2 were further investigated. Results showed that the performance of ZrO 2 -WO 3 prepared by blending method for NH 3 -SCR of NO was significantly better than that of WO 3 /ZrO 2 prepared by impregnation method. The ZrO 2 -WO 3 containing 20% WO 3 has the best performance in NH 3 -SCR of NO with NO conversion higher than 90% and N 2 selectivity higher than 90% at 450–650 °C, and the performance was not affected by SO 2 , slightly affected by competitive adsorption of water vapor at 450 °C and not disturbed by water vapor above 500 °C. Further investigation showed that the NH 3 -SCR of NO over the ZrO 2 -WO 3 reaction followed both L-H and E-R mechanisms. Characterization analysis revealed that ZrO 2 -WO 3 has finer microscopic particles, larger specific surface area, higher acid amount and stronger acid strength than WO 3 /ZrO 2 .
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DOI
高影响因子
RSC Advances
·
2026
·
IF 6.1
Baoliang Lv,Wei Zhang,Guohua Zhang,Guofu Zhang,Miao Zhang,Shoufeng Xue,Huixiang Wang
The epoxidation of long-chain α-olefins is an effective strategy for optimizing synthetic oil products and expanding their high-value-added derivatives. Tungsten trioxide (WO 3 ) is a promising catalyst for this reaction, yet pure WO 3 suffers from low specific surface area and a high density of Brønsted acid sites (B acid), resulting in poor activity and selectivity. Herein, graphene oxide (GO) was employed as a support to anchor WO 3 via an in situ growth strategy. Leveraging the strong interaction between the oxygen-containing functional groups of GO and the acidic hydroxyl groups of WO 3 , we achieved both high dispersion and effective reduction of B acid sites on WO 3 , successfully fabricating a high-performance WO 3 /GO catalyst. In the epoxidation of 1-octene, the WO 3 /GO catalyst exhibited excellent performance, specifically, its catalytic activity for producing 1,2-epoxyoctane increased from 7.9 mmol g WO 3 −1 h −1 (pure WO 3 ) to 20.3 mmol g WO 3 −1 h −1 , representing a 2.6-fold enhancement in catalytic efficiency. The catalyst also exhibited excellent performance towards other long-chain α-olefins. This study provides a simple, efficient, and dual-benefit strategy for the structural modification of WO 3 -based catalysts, offering a promising approach for designing low-acid, highly dispersed metal oxide catalysts for the efficient conversion of long-chain α-olefins. In situ anchoring of WO 3 onto GO enables high dispersion and reduced B acidity, boosting 1-octene epoxidation activity by 2.6 times.
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