ChemistrySelect
·
2025
·Vol. 10
·期 13
·e202500943
·
IF 2
Yuzhuo Hu,Chen Wang,Yuying Wang,Huawei Zhou
Graphical The effect of oxygen vacancies in WO 3-x on supercapacitors is currently unclear. In this study, we synthesized WO 3-x with rich oxygen vacancies, as an electrode of supercapacitor. The results imply that oxygen vacancies in WO 3-x make it a promising candidate for supercapacitor applications. The study about the relationship between micro-nano structure and performance in supercapacitors is important. Oxygen vacancies are prevalent in tungsten oxide. The effect of oxygen vacancies in WO 3-x on supercapacitors is currently unclear. In this study, we synthesized WO 3-x , an electrode material with rich oxygen vacancies, using a solvothermal-calcination method. The micro-nano structures of WO 3-x was characterized using SEM, EDS, XRD, FTIR, XPS, and UV–vis absorption spectrum, WO 3 serving as a comparative control. The above structural characterization demonstrated that there are more oxygen vacancies in WO 3-x than WO 3 . The electrochemical performance of the WO 3-x electrode was assessed through both three-electrode and asymmetric supercapacitors (ASCs). The results of CV and EIS indicate that better capacitance performance comes from more electron transport (larger current in CV) and faster electron transport (smaller R ct in EIS). The GCD tests show that WO 3-x has a greater specific capacitance (35.03 F g −1 ) than WO 3 (19.76 F g −1 ) at a current density of 0.1 A g −1 across a potential range of 0.0 to 3.5 V. Additionally, WO 3-x ASC displays superior cycling stability, maintaining 69.07% of its initial specific capacitance over 10,000 cycles at 0.5 A g −1 . These results imply that oxygen vacancies in WO 3-x make it a promising candidate for supercapacitor applications.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 6
·3140-3150
·
IF 3.925
Xingrui Qi,Zhidong Zhao,Nian Li,Zijian He,Yufang Chen,Tao Jin
At present, water resources contaminated by pathogenic microorganisms have an increasingly serious impact on human health. Photocatalytic sterilization using solar energy is an inexpensive and effective method. However, how to effectively utilize solar energy and improve the photocatalytic performance of catalysts is the main problem at present. In this work, urchin-like WO3−x and Cu-doped WO3−x were synthesized by a simple method. The synthesized photocatalysts were characterized in detail, and the sterilization performance of the catalysts was investigated under simulated sunlight. The sterilization rates of WO3−x against Escherichia coli and Staphylococcus aureus were 65.74% and 94.73%, respectively, while the sterilization rates of WO3−x doped with Cu against these two bacteria were 99.95% and 99.24%, respectively. Cu–WO3−x shows excellent photocatalytic bactericidal performance, which is attributed to the enhanced oxygen vacancies of WO3−x and the separation of photogenerated electron–hole pairs by the doping of Cu. This work is expected to provide an effective way to develop solar photocatalytic sterilization.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Ya-hui YANG,Ren-rui XIE,Hang LI,Can-jun LIU,Wen-hua LIU,Fa-qi ZHAN
A novel WO 3– x /TiO 2 film as photoanode was synthesized for photoelectrocatalytic (PEC) reduction of CO 2 into formic acid (HCOOH). The films prepared by doctor blade method were characterized with X-ray diffractometer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The existence of oxygen vacancies in the WO 3– x was confirmed with an X-ray photoelectron spectroscopy (XPS), and the accurate oxygen index was determined by a modified potentiometric titrimetry method. After 3 h of photoelectrocatalytic reduction, the formic acid yield of the WO 3– x /TiO 2 film is 872 nmol/cm 2 , which is 1.83 times that of the WO 3 /TiO 2 film. The results of PEC performance demonstrate that the introduction of WO 3– x nanoparticles can improve the charge transfer performance so as to enhance the performance of PEC reduction of CO 2 into formic acid.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2016
·Vol. 31
·期 8
·1065-1076
·
IF 1.579
Zhenguang Shen,Zengying Zhao,Jingwen Qian,Zhijian Peng,Xiuli Fu
Tungsten oxide (WO3−x) nanomaterials with controlled morphology and composition were fabricated by thermal evaporation of WO3 and S powders at different temperatures in a vacuum tube furnace. At 850 °C the obtained green particle is still of the same monoclinic WO3 phase as that of the starting powder. At a temperature between 900 and 1100 °C, the resultant dark-blue products are particle-like clusters composed of numerous monoclinic WO2.90 short nanorods, but the clusters became looser and the nanorods grew somewhat longer as the temperature increased. At a temperature between 1150 and 1250 °C, elongated and thoroughly separate purple-red monoclinic W18O49 nanorods were obtained. The growth of the prepared WO3−x nanomaterials was controlled by a gas–solid mechanism. Their photocatalytic degradation on organic contaminants was evaluated by decomposing methylene blue (MB) in aqueous phase under sunlight, in which WO3 particles presented higher photocatalytic activity than its oxygen-deficient counterparts, WO2.90 and W18O49. But the W18O49 nanorods had higher adsorption ability to MB in all the samples.
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
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.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2018
·
IF 0
Kainan Song,Xueming Liu,Chen Tian,Hong Deng,Jide Wang,Xintai Su
In present study, two group of WO 3-x nanocrystals (NCs) have been prepared via a facile solvothermal process and their photocatalytic activities for dehydration of isopropyl alcohol (IPA) to propylene (C 3 H 6 ) under visible light irradiation have been studied. The photocatalysts are characterized by XRD , FSEM, HRTEM , XPS and UV–vis spectroscopic study. As for WO 3-x NCs synthesized under different temperature, the highest photocatalytic efficiency was achieved for the W 18 O 49 NCs prepared at 160 °C at C 3 H 6 evolution rate of 145 μmol h −1 g −1 . When it comes to the WO 3-x NCs obtained using different solvents, the sea urchin-like W 18 O 49 microspheres synthesized in ethanol has the greatest activity for photocatalytic dehydration of IPA. Their outstanding photocatalytic performances may stem from the large amount of oxygen vacancies (OVs) on their surfaces. The above results suggest the high potential of WO 3-x NCs in application for C 3 H 6 production.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
Journal of Energy Chemistry
·
2024
·
IF 14
Zhijie Zhang,Xuesheng Wang,Junyi Qian,Jiayue Xu
Heterojunction construction, especially S-scheme heterojunction, represents an efficient universal strategy to achieve high-performance photocatalytic materials. For further performance stimulation of these well-designed heterojunctions, modulating the interfacial internal electric field (IEF) to steer dynamic charge transfer represents a promising approach. Herein, we realized the precise regulation of Fermi level ( E F ) of the oxidation semiconductor (mesoporous WO 3− x ) by tailoring the concentration of oxygen vacancies (V O ), maximizing the IEF intensity in Cs 2 CuBr 4 @WO 3− x (CCB@WO 3− x ) S-scheme heterojunction. The augmented IEF affords a robust driving force for directional electron delivery, leading to boosted charge separation. Hence, the developed CCB@WO 3− x S-scheme heterojunction demonstrated outstanding photocatalytic CO 2 reduction performance, with the electron consumption rate ( R electron ) up to 390.34 μmol g −1 h −1 , which is 3.28 folds higher than that of pure CCB. An in-depth analysis of the S-scheme electron transfer mode was presented via theoretical investigations, electron spin resonance (ESR), photo-irradiated Kelvin probe force microscopy (KPFM), and in-situ X-ray photoelectron spectroscopy (XPS). Finally, the CO 2 photoconversion route was explored in detail using in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and DFT theoretical calculations.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wei Ding,Xingjian Wang,Chao Yang,Pengzhen Wang,Weiliang Tian,Kun Zhao,Kewei Zhang
Interfacial composite with improved carrier separation is promising to achieve multifunctionality and thus contribute to the carbon neutrality and sustainability of our society. Herein, we demonstrate a facile defect-assisted photo-reduction strategy to rationally design interfacial rGO/WO 3−x composites with versatile properties. Under light irradiation, the accumulated electrons in oxygen-defective WO 3−x endow partial restoration of the π network within GO nanosheets. The in-situ formed rGO/WO 3−x not only broadens optical absorption but also accelerates carrier migration, enabling superior gas-sensing, photocatalytic and energy storage applications. When used as sensing material of smart sensors, the resultant rGO/WO 3−x exhibits high response (8.4), low detection limit (92 ppb), good selectivity, fast response, and long-term stability (7 weeks) to ppm-level triethylamine. As an efficient photocatalyst, the photocatalytic kinetic of rGO/WO 3−x towards visible-light-driven RhB degradation is promoted about 7 times as compared with that of pristine WO 3−x . The synergism of suitable components endows the rGO/WO 3−x supercapacitor with high capacity (380F/g) over prolonged cycling. This work provided a successful approach for in-situ formation of interfacial composites and thus broadens the material’s versatility for advanced nanotechnology.
研究领域:
材料科学
·
纳米技术
·
能源与环境
✓ 已验证
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 12
·2200138
·
IF 0
Linlin Zhang,Lu Liu,Xiaodong Zhang,Chengjun Ge,Jianjun Liao
Pharmaceuticals and personal care products (PPCPs) have attracted widespread attention due to their durability to the environment. Therefore, it is highly desirable to develop new technologies that are environmentally friendly, energy saving, and compatible to degrade these pollutants. In this study, a vis–NIR-driven and highly efficient S-scheme photocatalyst, WO 3− x /S doped g-C 3 N 4 , is used for PPCPs degradation. The results show that the photocatalytic activity of WO 3− x /S doped g-C 3 N 4 composite system for PPCPs is much higher than that of WO 3− x and g-C 3 N 4 . The introduced WO 3− x has a great positive effect on the photocatalytic performance of WO 3− x /S doped g-C 3 N 4 S-scheme composite photocatalyst for both naproxen and diclofenac. Due to the fast photogenerated carrier separation brought by the S-scheme, the WO 3− x /S-doped g-C 3 N 4 nanocomposite exhibits enhanced performance in photocatalytic PPCPs degradation. The degradation rate of naproxen is 99.2%, and the degradation rate of diclofenac can also be as high as 99.5%. This research has important reference value for the synthesis of WO 3 -based S-scheme photocatalysts for energy and environmental applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 10
·1637
·
IF 5.719
Siqi Qu,Jing Guan,Dongqi Cai,Qianshuo Wang,Xiuyun Wang,Wei Song,Wei Ji
Electrochemical surface-enhanced Raman scattering (EC-SERS) spectroscopy is an ultrasensitive spectro-electrochemistry technique that provides mechanistic and dynamic information on electrochemical interfaces at the molecular level. However, the plasmon-mediated photocatalysis hinders the intrinsic electrochemical behavior of molecules at electrochemical interfaces. This work aimed to develop a facile method for constructing a reliable EC-SERS substrate that can be used to study the molecular dynamics at electrochemical interfaces. Herein, a novel Ag-WO3−xelectrochromic heterostructure was synthesized for EC-SERS. Especially, the use of electrochromic WO3−xfilm suppresses the influence of hot-electrons-induced catalysis while offering a reliable SERS effect. Based on this finding, the real electrochemical behavior of p-aminothiophenol (PATP) on Ag nanoparticles (NPs) surface was revealed for the first time. We are confident that metal-semiconductor electrochromic heterostructures could be developed into reliable substrates for EC-SERS analysis. Furthermore, the results obtained in this work provide new insights not only into the chemical mechanism of SERS, but also into the hot-electron transfer mechanism in metal-semiconductor heterostructures.Keywords:SERS;defect states;EC-SERS;Ag-WO3−xfilm
研究领域:
材料科学
·
电化学
✓ 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）