Journal of Materials Chemistry A
·
2025
·
IF 9.5
Shuwen Zhu,Huiqing Fan,Yuxin Jia,Yongbo Fan,Weijia Wang
Due to the unique properties of heterojunction interfaces, heterojunction materials have broad application prospects in gas sensors. In this study, we synthesized In2O3 microrods through direct calcination of MIL-68(In) at ambient condition. Subsequently, WO3/In2O3 n-n heterojunction composites were built via a solvothermal method. The sensors fabricated with this heterojunction demonstrated exceptional TEA sensing capabilities, such as excellent selectivity and stability, a high response value of 678.43 to 20 ppm TEA, a fast response time (11 s) and a low operating temperature of 160°C. The increased sensing performance is attributed to the improved specific surface area, distinct barrier-controlled electron transport present in n-n type heterojunctions, and the unique selectivity of WO3 to TEA. This work not only offers a strategy for creating heterojunction-rich sensing materials, but also an efficient way for TEA detection.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuwen Zhu,Huiqing Fan,Yao Su,Yongbo Fan,Weijia Wang
Real-time monitoring of triethylamine (TEA) is essential for environmental safety and various applications in daily life. However, TEA gas sensors still encounter specific technical challenges, such as high operating temperatures and insufficient sensitivity. In this study, in order to reduce the operating temperature and improve sensitivity, WO 3 -MoO 3 (WMo) n-n heterojunctions were synthesized via calcination and subsequent solvothermal method, in which WO 3 tightly bound to the MoO 3 nanobelt surface. The resulting heterojunction demonstrated excellent TEA sensing performance. The optimized gas sensor achieved a high response of 627.28 to 20 ppm TEA at a low operating temperature (100 °C). In addition, the device exhibited strong selectivity and stability. These improvements in gas sensing performance were attributed to the formation of n-n heterojunction between MoO 3 and WO 3 , as well as the surface gas sensing reaction of oxygen species facilitated by oxygen vacancies at the heterojunction interface. This study can be applied to the design of novel n-n type metal oxide heterojunction materials for the application of low-temperature high-sensitivity TEA sensors.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Lirong Chen,Jieyuan Zheng,Xiaoli Chen,Yang Zheng,Xingru Wang,Rui Ge,Chengyu Jiang,Gang Xu,Liuwen Zhong,Yanqing Zhu,Xiudi Xiao
Response time (τ, defined as the time required for 90% change in the full transmittance modulation, including coloring time τ c and bleaching time τ b ) is an important evaluation index for the performance of electrochromic (EC) materials, and it can directly reflect the microscopic rate of EC process. However, the research on the internal relationship between the response time and the process of electrochemical dynamics is rare. Herein, by controlling the thickness of the WO 3-x EC film, a complete reversal of the response time (from τ c > τ b in the thinner film to τ b > τ c in the thicker film) is observed. Based on the detailed analysis of the characteristics presented in electrochemical impedance spectroscopy (EIS), especially focusing on the changing trend about the arc of different frequency ranges and the slope value of the linear part, it can be found that this reversal is due to the change of the main dynamics process from surface capacitive-controlled to bulk diffusion-controlled with the increase of WO 3-x film thickness. Meanwhile, this change with obvious film thickness dependence requires a "trigger", which is reflected by the bleaching threshold potential. Besides, this study reveals the three stages of the EC coloring process from the perspective of dynamics, including the lithium-ions (Li-ions) adsorption charge layer, surface Faraday process, and bulk Faraday process, which also show significant film thickness dependence. The result of this work is beneficial to modulate the balance of response time and to improve the performance of EC films.
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ACS Catalysis
·
2025
·
IF 13.1
Huimin Zhang,Ping Song,Xuanhao Mei,Dezheng Zhang,Cong Liu,Mingtao Chu,Teng Zhang,Ce Han,Weilin Xu
Developing an efficient and stable bifunctional electrocatalyst for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in acidic media is of great significance, yet remains challenging. Herein, a bifunctional electrocatalyst supported by carbon cloth, denoted as IrNiOx/WO3, was designed and synthesized through heterostructured coupling of active amorphous IrNiOx with stable crystalline WO3. Benefiting from the pronounced electron interaction stemming from the as-generated numerous heterointerfaces, as-fabricated IrNiOx/WO3 demonstrates a low cell voltage of 1.539 V to achieve 10 mA cm–2 for water splitting with a low Ir loading of 0.8 wt % while maintaining stability over 100 h of continuous electrolysis in 0.5 M H2SO4. Furthermore, through comprehensive structural characterization and theoretical analysis, it was revealed that the Ir sites in the Ir–O–Ni configuration within amorphous IrNiOx serve as the primary active sites for both HER and OER processes. Moreover, the corresponding energy barriers were found to be significantly lowered due to the strong electronic interaction between amorphous IrNiOx and crystalline WO3. This study provides a strategy for designing amorphous–crystalline heterostructured electrocatalysts with ideal interfacial properties for efficient overall water splitting.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yechen Wang,Yaru Wang,Jianjun Zhao,Yiming Xu
Production of H 2 O 2 via semiconductor photocatalysis has received an increasing attention. Herein the effects of cations in perchlorate form and anions in sodium form are examined. Experiment was conducted with Au/WO 3 under visible light in presence of methanol. The production of H 2 O 2 was greatly promoted by A (Ni 2+ , PO 4 3− , CO 3 2− , and F − ), slightly increased by B (SO 4 2− , NO 3 − , Cl − , and ClO 4 − ), greatly inhibited by C (Cu 2+ , and Fe 3+ ), and slightly decreased by Co 2+ . Moreover, the effect of Ni 2+ was weakening by F − , and vice versa. Analysis showed that Ni 2+ was oxidized into Ni 3+ , reactive to methanol, not to water. On Au/WO 3 electrode, anions A inhibited O 2 reduction, and promoted methanol photo-oxidation, while all anions had little influence on the pathway of O 2 reduction. A plausible mechanism is proposed, involving the hole oxidation of anions (not F − ), followed by methanol oxidation. This work highlights the importance of inorganic ions to the selective reduction of O 2 .
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CHEMOSPHERE
·
2024
·
IF 8.1
Qi Chen,Ling Hu,Yingzhang Shi,Cheng Liu,Yidong Hou,Jinhong Bi,Jimmy C. Yu,Ling Wu
Heterogeneous photocatalytic degradation of antibiotic involves the activation of antibiotic molecules and the photocatalytic oxidation process. However, the simultaneous improvement of these processes is still a challenge. Herein, S-scheme heterojunctions consisted of Cu 2 O nanocluster with defective WO 3 nanosheets were constructed for efficient photocatalytic degradation of levofloxacin (LVX). The typical CNS-5 composite (5 wt% Cu 2 O/WO 3 ) achieves an optimal LVX degradation efficiency of 97.9% within 80 min. The spatial charge separation and enhancement of redox capacity were realized by the formation of S-scheme heterojunction between Cu 2 O and WO 3 . Moreover, their interfacial interaction would lead to the loss of lattice oxygen and the generation of W 5+ sites. It is witnessed that the C–N of piperazine ring and C O of carboxylic acid in LVX are coordinated with W 5+ sites to build the electronic bridge to activate LVX, greatly promoting the further degradation. This work highlights the important role of selective coordination activation cooperated with S-type heterojunctions for the photocatalytic degradation and offers a new view to understand the degradation of antibiotics at molecular level.
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PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Xinyao Wang,Shaofen Zhao,Wei Shi,Jiangli Sun,Zheming Ni,Shengjie Xia
In this study, WO 3 @NiCr-LDHs Z-scheme heterojunctions have been synthesised for the photodegradation of NOR. A comprehensive investigation was conducted into the effects of the Ni/Cr ratio, catalyst dosage, norfloxacin concentration, temperature and pH of the aqueous environment on the degradation activity of the composites. Furthermore, the stability and reusability of the catalyst after the reaction were discussed. The structural composition and morphological features of the materials were characterised by XRD, SEM and TEM, and the photoelectric properties of the heterojunctions were investigated by photoluminescence spectroscopy and UV–vis diffuse reflectance spectroscopy. The experimental findings demonstrated that a quantity of 15 mg of WO 3 @NiCr-LDHs in conjunction with 50 ml of a 10 mg/L norfloxacin solution in an aqueous environment at a temperature of 20°C and a pH of 7, resulted in 86.01 % of the material being degraded after 120 min of light irradiation. This value was found to be 2.75 and 1.23 times higher than that of WO 3 and LDHs, respectively. Kinetic and thermodynamic analyses indicated that the catalyst amount and temperature were the predominant factors influencing the photodegradation process. The efficient photodegradation is attributable to the built-in electric field produced by the Z-scheme heterojunction, which promotes the separation of photogenerated electron holes, allowing more electrons to be converted into free radicals to work with the holes in the degradation of NOR.
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CHEMOSPHERE
·
2019
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IF 5.108
Ying Zeng,Na Guo,Xingjian Xu,Yong Yu,Quanying Wang,Na Wang,Xuerong Han,Hongwen Yu
WO 3 @MoS 2 /Ag (HW@MA) hollow tubes were successfully engineered to photodegrade bisphenol A (BPA) combined with peroxymonosulfate (PMS) for the first time. XRD, XPS, TEM and SEM were conducted. The HW@MA tubes present excellent photocatalytic performance on the removal of BPA. The intermediate products of BPA were investigated by GC-MS analysis and the degradation pathway was proposed. To explore the transferred mechanism of photoproduced carriers, the electron paramagnetic resonance (EPR) technique was carried out. The results revealed that the superoxide radical ( O 2 − ), hydroxyl radical ( OH), sulfate radical ( SO 4 − ) were the main active radicals. Moreover, the formed schottky junctions enhanced the separation efficiency of photoinduced electron-hole pairs. Besides, the effect of the photocatalysts’ dosage, PMS concentration, pH of the initial solution and co-existing anions on the BPA degradation were investigated.
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Catalysts
·
2025
·Vol. 15
·期 5
·460
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IF 4
Yameng Wang,Ao Xu,Jihui Lang,Bin Zuo,Zihan Yu,Keyu Cui,Xuefei Li,Kewei Zhang,Xin Li,Maobin Wei,Jian Cao
CO2photoreduction technology offers significant potential for addressing energy and environmental challenges, though its practical application is hindered by insufficient photo-absorption and rapid carrier recombination. Herein, we constructed the WO3/In2S3S-scheme heterojunction through hydrothermal assembly of two-dimensional WO3nanosheets and scale-like In2S3nanoflakes. Systematic characterization via XRD, XPS, SEM, and TEM verified the successful preparation of hierarchical nanostructures with optimized interfacial contact in the WO3/In2S3composites. UV-Vis DRS analysis showed that the photo-absorption range of the catalyst was significantly widened. Photoelectrochemical investigations (EIS, TPR, PL, and LSV) revealed enhanced carrier separation efficiency and reduced recombination kinetics in the heterojunction system. The optimized WO3/In2S3(WI-60) catalyst had a CO evolution efficiency of 55.14 μmol·g−1under the UV-Vis light, representing a 3.9-fold enhancement over the pure In2S3(14.08 μmol·g−1). Mechanistic studies through the XPS and band-structure analysis confirmed the establishment of an S-scheme carrier’ transfer pathway, which simultaneously preserved strong redox potentials and promoted the separation process of carriers. This research provides a validated strategy for developing efficient S-scheme photocatalytic systems for solar fuel generation.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 35
·期 1
·1700280
·
IF 4.474
Yin Zhang,Yanfei Zhu,Wencai Zhou,Xueying Qiu,Zhiyong Tang
To find cheap and commercially available materials that are efficient in the catalytic process is of paramount importance for practical application in both chemical and biomedical engineering. As-purchased nanosized semiconductors are systematically investigated as catalysts in visible light driven asymmetric reactions with the help of chiral ligands. Significantly, among varied semiconductors, WO 3 exhibits the best performance with 91% enantiomeric excess and 95% conversion ratio.
研究领域:
化学工程
·
生物医学工程
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材料科学
·
催化
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 6
·1-12
·
IF 2.5
Wang Jiatai,Fan Chao,Li Yuanyuan,Wang Yan,Yan Xiaocen,Deng Changjuan,Li Jian
LiNi 0.815 Co 0.15 Al 0.035 O 2 (NCA) has attracted a lot of attention owing to its high specific capacity and low cost. The problems of capacity loss and interface side reaction during the long cycle hinder the application of NCA cathode materials. In this work, WO 3 -coated LiNi 0.815 Co 0.15 Al 0.035 O 2 cathode materials were successfully prepared, which greatly improved the electrochemical properties of the NCA. Results of XRD show that the WO 3 coating has no significant effect on the structure of the NCA samples. Results of XPS show that WO 3 coating is beneficial to reduce the content of residual alkali substance on the surface of the NCA. In addition, the first discharge specific capacity of NCA@2wt%WO 3 is 174.96 mAh g − 1 at a current density of 1.0 C, with a capacity retention rate of 89.94% after 200 cycles. The discharge specific capacity of NCA@2wt%WO 3 is 137.74 mAh g − 1 at 5.0 C. The coating of WO 3 effectively improves the electrochemical performance of NCA cathode materials.
研究领域:
材料科学
·
电化学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Guanyu Yao,Jun Yu,Hao Wu,Zhongzhou Li,Wenjing Zou,Huichao Zhu,Zhengxing Huang,Hui Huang,Zhenan Tang
Nanosheet-assembled microspheres of tungsten oxide doped with antimony were synthesized via hydrothermal method . Sb doping changed the valency of W, promoted a partial crystal phase transition from orthorhombic to hexagonal, and modified the surface morphology . Further, WO 3 is an n-type semiconductor and is sensitive to gases above 100 °C. The Sb-WO 3 sensors in this work were p-type semiconductors from 25 °C to 65 °C, and exhibited excellent sensitivity, fast response and good recovery properties to NH 3 . At 35 °C, the detection limit of 1 at% Sb-WO 3 for ammonia was 200 ppb, and the sensor shows a good stability and selectivity toward several possible interferent . The substantially improved sensing performance of the Sb-WO 3 sensors at near room temperature could be mainly attributed to the change of the W valency promoted via Sb doping.
研究领域:
材料科学
·
传感器技术
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