Micro & Nano Letters
·
2020
·Vol. 15
·期 1
·58-63
·
IF 0.975
Yu She,Yufu Zhu,Lei Zhou,Yuanmi Yuan,Jing Hao,Qingsong Jiang
In this study, tungsten oxide microstructures/nanostructures with different morphologies were prepared by the hydrothermal synthesis methods. The morphologies and structures of the obtained products were characterised by field-emission scanning electron microscopy and X-ray diffraction. The photocatalytic properties of tungsten oxide microstructures/nanostructures were characterised by the degradation of rhodamine B solution. The results indicate that tungsten oxide microspheres prepared by using tungstic acid and hydrogen peroxide solution as raw materials show the highest photocatalytic activity. By changing the concentration of tungstic acid used in the synthesis process, the morphologies of tungsten oxide microspheres can be controlled. The influences of the amount of chemical reagent addition on its morphology and catalytic properties were discussed. In order to further improve the photocatalytic activity of the samples, Ag nanoparticles were loaded on the obtained tungsten oxide microspheres. The photocatalytic experiment results indicate that the photocatalytic performance of tungsten oxide was improved by Ag loading. The results indicate that Ag-loaded tungsten oxide microspheres are favourable for their photocatalytic applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hao Jiang,Yian Wang,Jue Hu,Xuxia Shai,Chengxu Zhang,Thiquynhxuan Le,Libo Zhang,Minhua Shao
Hydrogen peroxide (H 2 O 2 ), as one of the most important chemicals, is widely applied in many industries. Electrocatalytic oxygen reduction provides a safe and on-site method for H 2 O 2 synthesis. The research of transition metal oxides (TMOs) for H 2 O 2 synthesis is mainly focused on the modification of transition metal elements and graphene. Few studies directly control pure TMOs without changing supporting materials or introducing other elements. Here, we demonstrate for the first time a phase regulation strategy to develop highly selective and stable tungsten trioxide catalysts for H 2 O 2 generation through 2e − oxygen reduction reaction (2e − ORR). DFT calculations show that the kinetic energy barrier (0.08 eV) of the 2e − ORR pathway on the cubic tungsten trioxide (c-WO 3 ) surface is much lower than that of the 4e − ORR pathway (0.76 eV). As a result, a selectivity of 90 % and H 2 O 2 production rate of 179 mmol g cat −1 h −1 are achieved at 0.1 V vs RHE under alkaline conditions, outperforming all catalysts previously reported under the same conditions. Moreover, after continuous testing for more than 24 h at a constant potential of 0.1 V vs RHE, the H 2 O 2 generation rate has not been diminished, indicating an excellent stability of c-WO 3 in practical applications.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2026
·
IF 3.6
Siyuan Liu,Huijing Yang,Songjie Li,Xiaomei Yu,Jinhua Lai,Jin You Zheng
Abstract Photoelectrochemical (PEC) water splitting is a promising technology for producing clean hydrogen, but the slow rate of the oxygen evolution reaction (OER) severely limits its overall efficiency. WO3 is a competitive n-type semiconductor for OER photoanodes owing to its low cost, good electron mobility, and suitable band structure. In this study, we successfully fabricated WO3 photoanodes with preferred (002) crystal orientation via a simple sol−gel concentration strategy, without introducing any dopants or crystal-directing agents. The influence of calcination temperature and film thickness on PEC performance was systematically explored, and 500 °C was verified as the optimal calcination temperature for a well-crystallized structure and fast charge transfer. Under AM 1.5G simulated solar light and an applied potential of 1.57 V vs. RHE, the single-layer WO3(002) photoanode achieves a photocurrent density of 0.40 mA cm−2. Further thickness regulation via multi-layer spin-coating greatly improves light absorption and charge separation, and the optimized sample delivers a high photocurrent density of 2.11 mA cm−2. Characterizations confirm that the concentrated precursor effectively induces selective growth of active (002) facets. This work proposes a low-cost, scalable approach to tailoring WO3 crystal facets, providing valuable guidance for designing high-performance photoanodes for efficient PEC water splitting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Han Yu,Faguan Hu,Hongliang Xu,Bo Song,Hailiang Wang,Mingliang Li,Gang Shao,Bingbing Fan,Hailong Wang,Hongxia Lu
g-C 3 N 4 /WO 3 heterojunction composites were synthesized via an in-situ method by thermal polymerizing the mixture of dual precursors (urea and thiourea with molar ratio of 3:1) and different amount of tungstic acid. The as-synthesized g-C 3 N 4 /WO 3 composites, with lamellar and rod-like nano-porous structure, were mainly composed of g-C 3 N 4 and monoclinic WO 3 , in which the crystal size of WO 3 was about 5–10 nm. The specific surface area of the composite increased gradually with the tungstic acid dosage and reached 79.41 m 2 /g when the addition amount of tungstic acid was 1 wt%. The in-situ construction of g-C 3 N 4 /WO 3 heterojunction contributed to the reduction of band gap, improvement of the visible response range as well as the acceleration of the separation and migration of the photogenerated carriers. As the dosage of tungstic acid increased, the photocatalytic degradation performance of g-C 3 N 4 /WO 3 composite towards tetracycline improved gradually and achieved the optimum when the addition amount of tungstic acid was 0.1 wt% (CN/WO 3 -10). CN/WO 3 -10 (0.05g) degraded 83 % of tetracycline molecules (100 mL, 20 mg/L) after photocatalysis for 100 min, whose degradation rate constant was 10.1 and 1.48 times that of pure WO 3 and g-C 3 N 4 , respectively. Moreover, g-C 3 N 4 /WO 3 composite exhibited excellent stability and reusability for the photocatalytic degrading tetracycline. This work provides a facile and practicable approach for the preparation of g-C 3 N 4 /WO 3 composite.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Ziyu Jia,Jun Hu,Ping Lu,Yahui Sun,Yunjun Wang
Herein, using Ru/C and H 2 WO 4 as the catalysts, native lignin in biomass was efficiently depolymerized into monophenols following the lignin-first strategy at mild conditions. Upon the co-presence of Ru/C and H 2 WO 4 , birch lignin afforded monophenols in 40.4 wt% yield at 200 °C, which was 2.5 times that upon Ru/C and 7.5 times that upon H 2 WO 4 . 4-Propylsyringol and 4-propylguaiacol were two major products with a combined selectivity of 73%. 2D HSQC NMR of liquid product reveals that β-O-4 bonds in the soluble lignin fragments had been thoroughly disrupted. H 2 WO 4 dissolving at high temperatures promoted the solvolysis of lignin from the biomass matrix, and Ru/C enhanced the following reductive depolymerization. The solid catalysts can be readily recovered for reuse at room temperature after the hydrolysis of carbohydrates, and the catalysts exhibited high activity after four recycles.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yiding Li,Qiang Zhang,Simin Shen,Siqi Wang,Liangliang Shi,Dequan Liu,Yujun Fu,Deyan He
Effectively limiting the shuttle effect is the key to improving the electrochemical performance of Li-S batteries. Here, the synthesis of WO 3 -WS 2 heterostructures is reported by electrospinning and in situ sulfurization strategies, combining the initial WO 3 nanoparticles with the sulfurization product WS 2 . It was found that the obtained bifunctional heterostructures enhance the electrolyte wettability, optimize intermediate regulation performance, accelerate Li + /e − diffusion, and thus exhibit excellent electrochemical characteristics in Li-S batteries. Through experiments and density functional theory (DFT) calculations, the WO 3 -WS 2 heterostructures were considered as a coupled creative solution with multiple advantages. Different from the batteries using single-component or single-configuration catalyst, the prepared Li-S batteries with the WO 3 -WS 2 heterostructures exhibited synergistic enhanced electrochemical performance and high-temperature crushing resistance. Even under severe conditions, including high sulfur loading (10.3 mg cm −2 ), lean electrolyte (5.8 μL mg −1 ), high current density (7.0 A g −1 ), extended cycling (1600 cycles), and high temperature (90 °C), the representative battery exhibited stable cycling performance.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingrui Tong,Jinhui Wang,Ping Zhang,Pengyang Lei,Yi Gao,Ruirui Ren,Siyu Zhang,Rui Zhu,Guofa Cai
Tungsten trioxide (WO 3 )-based electrochromic devices have attracted great interest in smart windows, low-power displays, and other cutting-edge fields. The electrochromic behavior of WO 3 is strongly dominated by both electron conduction and ion diffusion process. Nevertheless, the structure–activity relationship of the WO 3 in the electrochromism has not been well elucidated so far. Herein, we systematically studied the relationship between the crystal structure composed of the fundamental units of typical WO 3 and the electron conduction/ion diffusion processes at a sub-nanoscale level. Our theoretical results unveil that the h-WO 3 with appropriate band gap by piling up the WO 6 octahedral molecular units along c axis profit electron conduction, and the continuous three-, six-ring tunnels along ab plane built by the units are conducive to ion diffusion. Therefore, the h-WO 3 film exhibits large optical modulation (up to 86% at 633 nm and 90% at 1000 nm), excellent cycling stability (86.4% of retention over 3000 cycles), and fast switching speed (1.9 s of bleaching time at 633 nm). Moreover, we provide unique insights between H + adsorption/desorption and the electrochromic response in the near-infrared region. We believe that this study lays a foundation for the design and construction of high-performance electrochromic nanomaterials and broadband tunable smart windows.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Qingdong Liao,Zhen Liu
Hexagonal tungsten oxide films were directly synthesized on fluorine-doped tin dioxide (FTO) coated glasses by the solvothermal method. The tungsten oxide films prepared by using glutaric acid as a self-crystallizing seeding agent and thiourea as a structural guide have a porous morphology with interwoven nanowires. The as-prepared films show excellent electrochromic performance in 1 M sulfuric acid, including 53 % optical modulation at 633 nm by applying ± 0.3 V, fast switching speed of 5 s for coloring and 2 s for bleaching, and high coloring efficiency of 144 C −1 cm 2 .
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 13
·4200-4206
·
IF 4
Jianxin Lv,Linghui Zhang,Lianxi Si,Hui Li,Wenbo Zhao,Fei An,Xia Feng,Shi Hu
Materials with accurate and durable gas detection are essential for gas sensors. We developed a facile and effective method to deposit Pd onto WO3 nanosheets and used the samples for hydrogen gas sensing. The combination of the 2D ultrathin nanostructure of WO3 and the spillover effect of Pd enables a detection concentration down to 20 ppm of hydrogen and high selectivity against other gases including methane, butane, acetone, isopropanol, etc. Moreover, the durability of the sensing materials was testified through 50 cycles of exposure to 200 ppm of hydrogen. These outstanding performances are mainly attributed to a homogeneous and tenacious decoration of Pd on the surface of WO3 nanosheets, providing an attractive choice for practical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·8391-8398
·
IF 3.3
Penghui Li,Huixiang Wang,Junhua Gao,Liancheng Wang,Jing Shi,Yu Meng,Junfen Li,Baoliang Lv
Supported tungsten oxide catalysts are promising candidates for olefin epoxidation with hydrogen peroxide (H2O2). Understanding the structure–activity relationship is of great importance for developing more efficient tungsten oxide-based catalysts. Herein, WO3–SBA-15 with an isolated tetrahedron WO4 is synthesized using a direct incorporation strategy, and its TOF is 191 h−1 in cis-cyclooctene epoxidation with H2O2, which is much higher than that of WO3/SBA-15 (51 h−1) prepared using an impregnation method and that of bulk-WO3 (0.4 h−1). Its lowest apparent activation energy of 34.6 kJ mol−1 also corresponded to the remarkable performance of WO3–SBA-15. Kinetic analysis indicated that WO3–SBA-15 bound H2O2 more strongly than other catalysts, resulting in the facilitated activation of H2O2. By correlating the specific activity and the structure characterization, we considered that the high reactivity of WO3–SBA-15 was attributed to (i) more isolated WO4 sites, which were of benefit to the coordination and activation of H2O2 and (ii) a stronger metal–support interaction derived from isolated WO4 species, which favored the dissociation of an O–O bond in the W–OOH intermediate and contributed to the insertion of an oxygen atom into an olefin double bond. Furthermore, DFT calculations indicated that the isolated tungsten oxide was beneficial for lowering the energy barrier of electrophilic oxygen atom transfer, thereby facilitating epoxidation.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Fuhang Mai,Zhe Wen,Yunfei Bai,Zewei Ma,Kai Cui,Kai Wu,Fei Yan,Hong Chen,Yongdan Li
A WO3/γ-Al2O3 catalyst prepared by an incipient-wetness impregnation method is employed in the selective conversion of enzymatic hydrolysis lignin (EHL) into various alkylphenols in supercritical ethanol. In the reaction, EHL is completely dissolved and converted into aliphatic and aromatic compounds with a total yield of 363.4 mg/g lignin at 320 °C for 8 h. The yield of aromatic compounds is 315.8 mg/g lignin, accounting for 86.9% of the total yield of the products, and the overall selectivity of alkylphenols reaches 67.5%. Compared to WO3 and H2WO4, the WO3/γ-Al2O3 shows a higher activity for the conversion of EHL in supercritical ethanol. Besides, ethanol is found to be the most effective solvent for the depolymerization of EHL with the WO3/γ-Al2O3 catalyst. The WO3/γ-Al2O3 keeps the high catalytic activity in three reuses.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2019
·Vol. 17
·期 1
·1-14
·
IF 5.345
Gasmalla Hind Baballa,Lu Xiaoquan,Shinger Mahgoub Ibrahim,Ni Lubin,Chishti Aadil Nabi,Diao Guowang
Background Iron oxide nanocomposites have received a great attention for their application in various fields like physics, medicine, biology, and material science etc., due to their unique properties, such as magnetism, electrical properties, small size, biocompatibility and low toxicity. Methods Fe 3 O 4 /Ag 3 PO 4 @WO 3 nanocomposites with different weight percent of Ag 3 PO 4 were successfully prepared through fabricated Ag 3 PO 4 /Fe 3 O 4 with WO 3 via in situ fabrication method, electrospinning involved precursor solution preparation and spinning to enhance photocatalyst performance under simulated sunlight for the degradation of methylene blue (MB) and antibacterial activity against Staphylococcus aureus ( S. aureus ). Results The photocatalytic degradation of methylene blue (MB) under simulated light irradiation indicated that the nanocomposite with 0.25 mg of Ag 3 PO 4 has the best activity. An additional advantage of these photocatalysts is magnetic recoverability, using external magnetic field and photocatalytic stability of the nanocomposites was evaluated for three cycles. In addition, using different scavengers, holes (h + ) and superoxide radical (O
·−) 2
radicals and hydroxide radical ( · OH) were identified the main oxidative species in the degradation reaction of methylene blue. Conclusions The results reveal that Fe 3 O 4 /Ag 3 PO 4 @WO 3 -0.25 nanocomposites have photocatalytic and antibacterial activity against S. aureus. The photocatalyst and mechanism based on the enhancement of electron transfer processes between Ag 3 PO 4 and WO 3 nanoparticles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）