Journal of Materials Chemistry A
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2015
·Vol. 3
·期 35
·18019-18026
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IF 7.443
J. J. Qi,S. Gao,K. Chen,J. Yang,H. W. Zhao,L. Guo,S. H. Yang
A three-dimensional (3D) hierarchical structure consisting of vertically aligned, double-sided, and self-supported WO3 nanocolumn bundles has been successfully synthesized via an acid-assisted (HCl) hydrothermal process without any templates, catalysts, or substrates. A possible formation mechanism is proposed, which involves dissolution–recrystallization and Ostwald ripening processes in concert with the structure-directing role of HCl, leading to the morphology grown along [200] with largely exposed (002) facets. The hierarchical monoclinic structure of the WO3-based sensor contains abundant active sites and loose structures which afford beneficial conditions for gas adsorption and diffusion, and the as-synthesized sensor proves to be an excellent NO2-sensing material with high sensitivity, good selectivity, rapid response (ca. 23 s)/recovery (ca. 11 s), and remarkable repeatability at a low operating temperature (∼110 °C). A possible gas-sensing mechanism will be discussed based on largely exposed (002) facets, the O-terminated (001) surface of which containing unsaturated coordinated O atoms is more active to adsorb NO2 molecules easily and efficiently. The superior gas sensor properties offer a potential platform for monitoring harmful and toxic gases, especially those flammable and explosive volatile organic compounds (VOCs).
研究领域:
材料科学
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纳米技术
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气体传感
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化学传感器
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无机合成
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Nature Communications
·
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.
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CHEMICAL PHYSICS LETTERS
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2022
·
IF 2.719
Lifeng Han,Yuheng Liu,Chaoqun Chang,Meng Liu,Zhikun Peng,Feilong Gong
We reported the design of cactus-like Mo-WO 3 nanoarchitecture assembled of 1D nanoneedles and 2D nanosheets for achieving a highly improved NO 2 sensing performance. The nanoneedles were vertically studding between the nanosheets forming a cactus-like WO 3 nanoarchitecture, leading to highly exposed absorption sites. Mo was introduced in the WO 3 nanoarchitecture to introduce oxygen vacancy, resulting in highly activated sites. The resultant 2%Mo-WO 3 delivered the sensitivity (Rg/Ra) of 285 to 10 ppm NO 2 , which was nearly three-times higher than that of pristine WO 3 . The recovery time was only 24 s, which was greatly decreased, compared with 172 s of pristine WO 3 .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Pengna Wang,Ying Sun,Jie Li,Guanqun Zhu,Xueqin Zhang,Hong Yang,Baoping Lin
Novel monomer TPACz containing carbazole and triphenylamine active groups was synthesized. P(TPACz)/WO 3 coralloid porous electrochromic electrode material were prepared by electropolymerization . The P(TPACz)/WO 3 coralloid porous composite electrode material exhibited independent electrochromic properties in the positive potential range (0−1.7 V) (yellow at neutral state and blue at oxidation state) and negative potential range (−1.8−0 V) with the color of the film changing from yellow to dark blue. At the same time, the electrochemical properties of P(TPACz)/WO 3 composite material ware tested. It is noteworthy that the P(TPACz)/WO 3 coralloid porous electrochromic composite electrode materials exhibit both n-type and p-type doped electrochemical properties . Especially, P(TPACz)/WO 3 exhibit excellent capacitive properties in the n-doped state. According to its GCD curve of P(TPACz)/WO 3 nanocomposite electrode material, the area ratio capacitance is 1.94 mF cm −2 in the positive potential window of 0−0.8 V. And the area ratio capacitance is 33.3 mF cm −2 in the negative potential window of −1.8−0 V. Therefore, the design and effects of the nanocomposite material can broaden application range of electrochromic electrode materials and provide new strategies for energy saving material design.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Feiyan Shi,Jiajun Li,Jiatong Xiao,Xinyu Zhao,Hongsheng Li,Qingda An,Shangru Zhai,Kai Wang,Li Wei,Yao Tong
The development of advanced energy storage systems, such as rechargeable batteries and supercapacitors (SCs), is one of the great challenges related to energy demand with the rapid development of world economy. Herein, a three-dimensional hierarchical porous lignin-derived carbon/WO 3 (HPC/WO 3 ) was prepared by carbonization and solvothermal process. This electrode material for supercapacitor can be operated at a wide voltage window range of −0.4 V to 1.0 V. More importantly, 3HPC/WO 3 with ultrahigh mass loading (~3.56 mg cm −2 ) has excellent specific capacitance of 432 F g −1 at 0.5 A g −1 and cycling stability of 86.6% after 10,000 cycles at 10 A g −1 . The as-assembled asymmetrical supercapacitor shows an energy density of 34.2 W h kg −1 at a power density of 237 W kg −1 and energy density of 16 W h kg −1 at a power density is 14,300 W kg −1 . A solid-state planar micro-supercapacitor (MSC) was fabricated using HPC/WO 3 nanocomposites. Moreover, the calculated specific capacity of MSC was 20 mF cm −2 in polyvinyl alcohol–sulfuric acid gel electrolyte. Overall, through the reasonable design of HPC/WO 3 nanocomposite materials and the efficient assembly of MSCs, the performance of the device was greatly improved, thus providing a clear strategy for the development of energy storage devices.
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FOOD CHEMISTRY
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2021
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IF 7.514
Jialing Song,Xuanhao Lin,Nan Jiang,Manhong Huang
Aptamer has been proved to be an important probe for antibiotic detection. Here, the electrical signal was doubly amplified by the synergistic effect of C-WO 3 and AuNPs. The probe structure has a specific recognition effect on tetracycline, which improves the selectivity and anti-interference of the sensor. With the assistance of BBD strategy, the experimental errors of the C-WO 3 @AuNPs aptasensor were reduced and the best conditions for its preparation were obtained. This was conducive to obtain the best electrical signal transmission capacity of the electrode, greatly improved the sensor sensitivity. Under this mechanism, the antibiotic sensor achieved a low detection range (0.1 nM–100 nM) and a low detection limit (4.8 × 10 −2 nM). The sensor showed excellent selectivity even in the presence of coexisting pollutants. This work explored the mechanism of charge change and demonstrated the role of probes in antibiotic sensing, providing important prospects of future applications in electrochemical sensors.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 56
·期 6
·4254-4265
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IF 3.553
Zhang Wenqiang,Zhu Xiaotong,Liang Liang,Yin Peng,Xie Peitao,Dastan Davoud,Sun Kai,Fan Runhua,Shi Zhicheng
With the rapid development of miniaturization and high integration of electronic devices, increasing attention has been paid to the exploration of dielectric composites with further improved dielectric permittivities. Herein, a unique design of high dielectric permittivity composites consisting of three-dimensional porous W-WO 3 /BaTiO 3 foams hosted in epoxy matrix is proposed. It is demonstrated that the introduction of W-WO 3 /BaTiO 3 foams into the epoxy matrix results in substantially improved dielectric permittivities in comparison with the epoxy matrix. Meanwhile, low loss which is comparable to that of the epoxy matrix is well maintained. Interestingly, obviously enhanced dielectric permittivities and greatly depressed loss are concurrently achieved via increasing the oxidation temperature. In particular, the composite with 53.1 wt% W-WO 3 /BaTiO 3 foam oxidized at 1300 °C exhibits a high dielectric permittivity of ~ 536 and a low loss tangent of ~ 0.05@10 kHz which are about 149 and 1.5 times those of the epoxy matrix, respectively. It is believed that the strong interfacial polarization and the numerous equivalent micro-capacitors result in the significantly improved dielectric permittivities. The finite element simulation results reveal that the formation of the WO 3 shell on the surface of W can effectively weaken the leakage current density, yielding the sharply depressed loss. This work provides a new strategy to design polymer composites with simultaneous high dielectric permittivity and low loss, and the strategy could also be applicable to the exploration of other high-performance dielectric composites.
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Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
J.C. Murillo-Sierra,A. Hernández-Ramírez,Zong-Yan Zhao,Angel Martínez-Hernández,M.A. Gracia-Pinilla
Heterogeneous photocatalysis has been considered as a green and sustainable alternative for water decontamination where the key step is the nanomaterials design to enhance the photocatalytic process. Therefore, in this study the photocatalytic degradation of an emerging contaminant as the tetracycline antibiotic in aqueous solution, was investigated under UV–Vis irradiation by using the WO 3 /ZnS photocatalyst. The coupled catalyst was synthesized by hydrothermal method and by varying the WO 3 weight ratio (5, 10 and 20 wt%) with respect to the ZnS. The WO 3 /ZnS photoactivity for tetracycline degradation was greatly enhanced when both semiconductors were coupled to form a highly efficient direct Z-scheme. The highest degradation percentage was reached using the catalyst t WO 3 (5%)/ZnS, which completely degraded the pollutant within 90 min, and the determination of total organic carbon (TOC) removal indicated a high mineralization degree. Photoelectrochemical studies showed that WO 3 (5%)/ZnS exhibited the highest separation of e − / h + pairs and the highest transfer efficiency. The improvement of the electron-hole separation in combination with the band alignment analysis, explained the intrinsic mechanism which corresponded to the direct Z-scheme photocatalytic system.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ding Wang,Lifeng Deng,Haijie Cai,Jialin Yang,Liping Bao,Yongheng Zhu,Xianying Wang
As a foodborne bacterium, Listeria monocytogenes (LM) can cause serious diseases and even death to weak people. 3-Hydroxy-2-butanone (3H-2B) has been proven to be a biomarker for exhalation of LM. Detection of 3H-2B is a fast and effective method for determining whether the food is infected. Herein, we present an excellent 3H-2B gas sensor based on bimetallic PtCu nanocrystal modified WO3 hollow spheres. The structure and morphology of the PtCu/WO3 were characterized, and their gas sensitivities were measured by a static testing method. The results showed that the sensor response of WO3 hollow spheres was enhanced by about 15 times after modification with bimetallic PtCu nanocrystal. The maximum response value of the PtCu/WO3 sensor to 10 ppm 3H-2B is as high as 221.2 at 110 °C. In addition, the PtCu/WO3 sensor also exhibited good selectivity to 3H-2B, fast response/recovery time (9 s/28 s), and low limit of detection (LOD < 0.5 ppm). Furthermore, the sensitivity mechanism was studied by monitoring the reaction products by gas chromatography–mass spectrometry. The excellent gas-sensing performance can be attributed to the synergy between PtCu and WO3, including the unique spillover effect of O2 on PtCu nanoparticles, the regulated depletion layer by p-type CuxO to n-type WO3, and their selective catalysis to 3H-2B. Hence, this work offers the rational design and synthesis of highly efficient sensitive materials for the detection of LM for food security.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xian-Yang Sun,Feng-Jun Zhang,Cui Kong
A novel porous g-C 3 N 4 /WO 3 photocatalyst was successfully obtained by adopting urea and WO 3 ⋅0.33H 2 O as precursor by a simple hydrothermal and calcination method. The structural characteristics, photoelectric properties , and hydrogen generation efficiency of g-C 3 N 4 /WO 3 were studied. The results shows that best photocatalytic hydrogen generation efficiency of the g-C3N 4 /WO 3 was 963 μmol −1 h −1 , it was about 3 times than pure g-C 3 N 4 . Hydrated tungsten oxide promotes the formation of porous structure after removing crystal water, and the increased pore volume and pore size provide more reactive activity sites, which contribute to increase the efficiency of hydrogen generation. The mechanism of photocatalytic hydrogen generation was proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·11829-11840
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IF 3.553
Xie Wenwen,Huang Zeai,Wang Ruiqi,Wen Cheng,Zhou Ying
Photocatalytic production of green oxidation reagents as an economical and environmental-friendly process is a promising strategy to replace the traditional production processes. In the present study, a series of 1.0 wt% Pt/WO 3 photocatalysts with different surface chemical states of Pt were successfully fabricated. The different surface metallic Pt (Pt 0 ) and oxidized Pt (PtO x ) ratios on WO 3 showed significant effects on the photocatalytic activities for strong oxidants of peroxydisulfate ( \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) ) and hydrogen peroxide (H 2 O 2 ) formations. It is proposed that surface Pt 0 and PtO x functioned as reduction site for O 2 reduction to H 2 O and oxidation site for H 2 O oxidation to H 2 O 2 , respectively, during the photocatalytic process. As a result, a higher surface composition of Pt 0 prepared using photodeposition (PD) method led to the formation of higher amount of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) . On the other hand, PtO x -loaded WO 3 using impregnation (IM) method showed significant formations of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) and H 2 O 2 simultaneously. This work provided a new idea for the design of noble metal Pt-supported WO 3 for efficiently photocatalytic generation of \( {\text{S}}_{ 2} {\text{O}}_{8}^{2 - } \) and H 2 O 2 .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
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IF 6.019
Zhenkui Li,Man Zheng,Na Wei,Yuan Lin,Wenlong Chu,Ruiqi Xu,Huanhuan Wang,Jian Tian,Hongzhi Cui
The design and synthesis of solar steam generation materials is a green and promising approach to produce freshwater from seawater or contaminated water. Here, we develop a highly efficient and stable bilayer evaporator by assembling WO 3-x nanorods (WO 3-x NRs) onto a wood surface. Due to the broad-band absorption of the WO 3-x NRs and the multiscatter of the incident light caused by the wood, the prepared solar evaporator with unique light trapping structures shows a high solar absorption (~94.0%). Additionally, combining with the merits of rapid water transport and heat localization , the energy conversion efficiency of the evaporator reaches as high as 82.5% under one sun irradiation and shows a stable water generation capability during long-term illumination cycles, which is one of the best performance compared with other wood-based materials and oxygen-defected tungsten oxide. The evaporator also shows great performance towards the evaporation of seawater and contaminated water, indicating great potential application. This work can provide reference for designing other high photothermal conversion system.
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