CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2021
·Vol. 37
·期 4
·900-905
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IF 1.307
Liu Xiaoyan,Zhou Yan,Zheng Tingting,Tian Yang
W ith the advancement of nanomaterials for surface-enhanced Raman scattering(SERS) detection, a deeper understanding of the chemical mechanism(CM) and further applications has been achieved. Herein, we prepared a porous tungsten trioxide(WO 3 ) film by the pulse electrodeposition method, and constructed a WO 3 film SERS aptasensor. With methylene blue(MB) as the adsorption molecule, the developed WO 3 film SERS aptasensor revealed remarkable Raman activity. Through experimental data and theoretical calculations, we found that the significant SERS enhancement[enhancement factor(EF)=1.5× 10 6 ] was due to the CM based on charge transfer and molecular resonance. Utilizing the Raman response of MB on the WO 3 film and specific aptamers, we successfully developed the aptamer sensor by covalently attaching the MB modified aptamer to the WO 3 film. The sensor realized the specific and sensitive determination of vascular endothelial growth factor(VEGF) with the detection limit down to 8.7 pg/mL. In addition, the developed aptasensor indicated the excellent selectivity among other interferences, such as metal ions, reactive oxygen species(ROS), and proteins. This WO 3 film SERS aptasensor not only contributed to the study of the enhancement mechanism of semiconductor material, but also provided a powerful platform for the sensitive detection of VEGF, possessing a great potential in the real-time monitoring of biomarkers of glioblastoma in vitro .
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Yuan Li,Hongtao Wang,Yueying Liu,Yueyue Li,Chenchang Wang,Jihao Bai,Lin Yang,Yilin Wang,Fengmin Liu,Xishuang Liang,Geyu Lu
Bimetallic nanocrystals (NCs) have received a lot of attention due to its excellent catalytic performance. Here, PtRu NCs were successfully synthesized by ethylene glycol and used to modify flower-like WO 3 which was prepared via a simple hydrothermal method . The morphology and structure of the as-synthesized materials were characterized, and the performance of the gas sensor based on PtRu NCs decorated WO 3 was carefully studied. The gas sensing investigation showed that there was a significant improvement in response after PtRu NCs being introduced. Among all samples, the WO 3 sample modified with 0.4 wt% PtRu NCs showed the highest response to xylene at 170 °C (Ra/Rg = 261), which is almost 75 times than that of pristine WO 3 . In addition, it also presented fast response speed (2 s), good selectivity to xylene and excellent repeatability. The possible sensitization mechanism was proposed, the improvement of sensing performance could be ascribed to the high catalytic activity of PtRu NCs, and the regulation of depletion layer by Schottky barrier and heterojunction at the contact interface between WO 3 and PtRu NCs. This work can be promising for rapid detection of xylene for environmental protection at low temperature.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 38
·21874-21883
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IF 10.733
Yidong Zou,Shibo Xi,Tao Bo,Xinran Zhou,Junhao Ma,Xuanyu Yang,Caozheng Diao,Yonghui Deng
In this study, a versatile multicomponent co-assembly strategy is developed to rationally construct ordered mesoporous amorphous Al2O3/crystalline WO3 heterophase materials (denoted as mAl2O3/WO3). These materials exhibit excellent performance as electrocatalysts in hydrogen evolution reaction (HER) at high Al2O3 contents and as gas sensors in acetone detection at low Al2O3 contents. X-ray absorption fine structure spectroscopy reveals an unexpected local phase transition of the framework from γ-WO3 to metastable ε-WO3 and lattice distortion, which accounts for their application performances. Compared with commercial WO3 powders and mesoporous WO3, the mAl2O3/WO3 hybrid materials exhibit a high cathodic current density of 100 mA cm−2 at an overpotential of −230 mV and a low Tafel slope (52 mV dec−1), close to that of expensive commercial 20% Pt/C (−219 mV and 48 mV dec−1), and they also possess high alkali-stability for even 10 000 cyclic voltammetric sweeps. Thanks to the synergic effect between the catalytic ability of Al2O3 and the strong interfacial interaction of WO3 toward acetone molecules (a typical biomarker for diabetes), the mAl2O3/WO3 nanocomposites with low contents of Al2O3 (<2 wt%) exhibit superior sensing performance toward acetone with excellent selectivity and higher responses even at low concentrations as compared with mesoporous WO3. The concept about designed synthesis of such mesoporous amorphous/crystalline nanocomposites with dual functions at different content ratios holds great promise in development of novel advanced functional materials.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Xingyu Xiao,Xinran Zhou,Junhao Ma,Yongheng Zhu,Xiaowei Cheng,Wei Luo,Yonghui Deng
Semiconducting metal oxides have attracted increasing attention in various fields due to their intrinsic properties. In this study, a facile solvent evaporation-induced multicomponent co-assembly approach coupled with a carbon-supported crystallization strategy is employed to controllably synthesize crystalline mesoporous nickel oxide-doped tungsten oxides in an acidic THF/H2O solution with poly(ethylene oxide)-b-polystyrene diblock copolymers (PEO-b-PS) as the structure-directing agent, tungsten(VI) chlorides as WO3 precursors, and Ni(AcAc)2 as the NiO precursor. The obtained materials possess a face-centered cubic mesoporous structure, large pore size (∼30 nm), high surface area (30–50 m2 g–1), large pore volume (0.15–0.19 cm3 g–1), and ultralarge pore windows (12–16 nm) connecting adjacent mesopores, and the mesoporous WO3 framework was decorated by ultrafine NiO nanocrystals. Due to their well-connected porous structure and high surface areas with rich WO3–NiO interfaces, the composite materials exhibit superior gas sensing performance with an ultrafast response (∼4 s), high sensitivity (Ra/Rg = 58 ± 5.1), and selectivity to 50 ppm H2S at a relatively low working temperature (250 °C). The chemical mechanism study reveals complicated surface reactions of WO3/NiO-based gas sensors, and SO2, WS2, and NiS intermediates were found to be generated during the gas sensing process.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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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.
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ELECTROCHIMICA ACTA
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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.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 14
·10338-10350
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IF 2.993
Xiao Yong-Hao,Yu Yu-Xiang,Zhang Wei-De
Novel visible-light-driven WO 3 nanorod arrays with oriented (200) facet were successfully synthesized via a facile solvothermal process using mixed ethanol and water as solvents. Subsequently, WS 2 quantum dots (QDs) derived from bulk WS 2 powder via ultrasonication were interspersed on WO 3 nanorod arrays. The presence of suitable volume ratio of ethanol is a key factor to achieve greater exposure of the WO 3 (200) facet. The morphologies, microstructures and optical properties of the prepared samples were systematically explored. The results illustrated that the preferential exposure on the (200) facet of WO 3 nanorods as well as the efficient relative electrochemically active surface areas provided by WS 2 QDs could facilitate the charge transfer between WS 2 QDs and the (200) facet of WO 3 nanorods. This study provides a promising approach to design high performance photoanodes for photoelectrochemical water splitting.
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HYDROMETALLURGY
·
2019
·
IF 3.465
Wenbo Lou,Yang Zhang,Shili Zheng,Ping Li,Ying Zhang,Yi Zhang,Bo Zhao,Zhefei Li,Wei Jin
China generates a large number of scrapped selective catalytic reduction (SCR) catalysts in the fossil fuel combustion plants every year. As a result, there is a giant quantity of 5 × 10 5 t scrapped V 2 O 5 -WO 3 /TiO 2 SCR catalyst annually worldwide, in which arsenic poisoning is a major cause of catalysts deactivation . In this study, a novel cleaner recovery process of alkaline-acid stepwise leaching was proposed for the high‑arsenic scrapped SCR catalysts to achieve excellent arsenic removal and structural reforming. It is found that arsenic can be completely removed from 1.92% to below the detection limit, and the surface area of regenerated catalysts is restored to 31 m 2 /g (similar to that of commercial catalysts). In the subsequent pickling and regeneration, Na + can be eliminated to obtain anatase-type TiO 2 for further activity recovery. Besides, valuable elements (W, V) have been successfully recycled by leaching the As-containing solid waste with ammonium salt. After replenishing active components, regenerated catalyst exhibits comparable activity with the commercial fresh catalyst, offering a promising method for scrapped catalyst recovery and further understanding of cleaner produces for waste management .
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 43
·21550-21557
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IF 9.931
Changyao Wang,Yujuan Zhao,Lili Zhou,Yang Liu,Wei Zhang,Zaiwang Zhao,Wael N. Hozzein,Hind M. S. Alharbi,Wei Li,Dongyuan Zhao
Transition metal oxides (TMOs)/carbon nanocomposites are promising for high capacity long life lithium ion batteries (LIBs). Herein, we report a mesoporous carbon matrix confinement growth strategy to synthesize ultrasmall WO3 nanocrystals for lithium storage. In this strategy, WCl6 and phenolic resins (resol) are co-assembled with amphiphilic diblock copolymer PEO-b-PS into ordered mesostructures through an evaporation induced self-assembly (EISA) process. During the pyrolysis process, the resol molecules can be polymerized and carbonized into amorphous mesoporous carbon matrices, which lock the amorphous W species well. Then, WO3 nanocrystals are formed and are uniformly distributed in the ordered mesoporous carbon matrix with the increased pyrolysis temperature; moreover, the particle size is well controlled to ∼3 nm under the confinement effect of the carbon matrices. The resultant ordered mesoporous carbon/WO3 composites show very large pore size (∼11.3 nm), high surface area (∼157 m2 g−1), high pore volume (∼0.25 cm3 g−1), and WO3 content of 84%. As an anode material for LIBs, the obtained composites show excellent cycling stability and rate performance. A high specific capacity of 440 mA h g−1 can be achieved after 100 cycles at a current density of 0.1 A g−1. We believe that such a confinement synthesis strategy is versatile to create TMO-based nanocomposites for outstanding LIBs.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2013
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IF 4.63
Jun Zhang,Jiang-ping Tu,Gao-hui Du,Zi-min Dong,Yi-shan Wu,Ling Chang,Dong Xie,Guo-fa Cai,Xiu-li Wang
Ultra-thin WO 3 nanorods (NRs) embedded polyaniline (PANI) composite thin films were synthesized by embedding WO 3 NRs into polyaniline using a surface-initiated-polymerization method, followed by spin-coating deposition. The ultra-thin WO 3 NRs with length of 60 nm and diameter of 4 nm were prepared by a solvothermal method . The nanofillers were well-dispersed in the polymer matrix . The nanocomposites were finally deposited onto ITO-coated glass via spin-coating technology. The electrochromic contrast, switching speed, and durability of the composite films were investigated in details. The composite film, being a dual electrochromic material, varied from purple to green, light yellow and finally dark blue. The switching speed (0.9 s) is much faster than the films only composed of WO 3 NRs. The durability of the hybrid film was enhanced compared with neat WO 3 NRs film.
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CHEMICAL ENGINEERING JOURNAL
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2013
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IF 3.473
Xinlin Liu,Yan Yan,Zulin Da,Weidong Shi,Changchang Ma,Peng Lv,Yanfeng Tang,Guanxin Yao,Yuting Wu,Pengwei Huo,Yongsheng Yan
In this report, a novel CdS–WO 3 nano-heterojunction photocatalyst was successfully synthesized by a multi-step hydrothermal method. Obtained samples exhibit enhanced photocatalytic activity compared with pure WO 3 and CdS for the degradation of Ciprofloxacin (CIP). Particularly, 30%-CdS–70%-WO 3 sample shows the highest degradation ratio (88.85%) of CIP among all samples, which is about 3 times over the pure WO 3 . This activity enhancement could be attributed to the fast migration of photo-induced charge-carriers, which can sufficiently inhibit the recombination of electron–hole pairs.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2013
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IF 3.187
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Ni–WO 3 /SBA-15 catalysts were prepared by an impregnation way and applied to the hydrogenolysis of cellulose in aqueous solution. The effect of nickel and WO 3 loading, catalysts reduction temperature and time on cellulose conversion were investigated. Up to 70.7% ethylene glycol yield was obtained over 3%Ni–15%WO 3 /SBA-15 catalysts. Several physicochemical methods such as XRD, Raman spectroscopy, NH 3 -TPD, H 2 -TPR and XPS were used to determine the character of catalysts. Based on these studies, it was found that there was a strong electronic interaction between NiO and WO 3 , which not only promoted the reduction of WO 3 , but restrained the reduction of NiO. Together with the experimental results, it can be concluded that the WO 3− X , which may be the active species for the selective cleavage of C C bond, was formed after catalysts pretreatment process. Additionally, a possible catalytic mechanism was proposed.
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