Nanomaterials
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2022
·Vol. 12
·期 5
·729
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IF 5.719
Rui Zhang,Hengrui Qiu,Youxiang Zhang
The tungsten-doped (0.5 and 1.0 mol%) LiNi0.88Co0.09Al0.03O2(NCA) cathode materials are manufactured to systematically examine the stabilizing effect of W-doping. The 1.0 mol% W-doped LiNi0.88Co0.09Al0.03O2(W1.0-NCA) cathodes deliver 173.5 mAh g−1even after 100 cycles at 1 C, which is 95.2% of the initial capacity. While the capacity retention of NCA cathodes cycled in identical conditions is 86.3%. The optimal performances of the W1.0-NCA could be ascribed to the suppression of impendence increase and the decrease in anisotropic volume change, as well as preventing the collapse of structures during cycling. These findings demonstrate that the W-doping considerably enhances the electrochemical performance of NCA, which has potential applications in the development of Ni-rich layered cathode materials that can display high capacity with superior cycling stability.Keywords:tungsten doping;phase transition;structural stability;electrochemical performance;LiNi0.88Co0.09Al0.03O2
研究领域:
材料科学
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电化学
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PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 10
·7177-7182
·
IF 1.354
Pham Hau Quoc,Huynh Tai Thien,Van Nguyen At,Van Thuan Tran,Bach Long Giang,Thanh Ho Van Thi
The degradation of Pt-based catalysts is considered as the main barrier to the commercialization of fuel cells. M-doped TiO2 (M is a transition metal) has been investigated to improve the stability of electrocatalysts. Recently, W-doped TiO2 materials have been
found as a good catalyst support for the photocatalyst applications but their application in Proton-exchange membrane fuel cell application has rarely been reported. In addition, the agglomeration of nanoparticles, which are synthesized from the organic precursor, has been reported. Here,
we report Ti0.7W0.3O2 nanoparticles prepared via a one-step solvothermal method with inorganic precursors without using surfactants or stabilizers for restricting nanoparticle agglomeration. The properties of the material were measured by XRD, TEM, BET, and
electronic conductivity. The mean particle size of ∼5 nm, the high specific surface area of 126.471 m2/g and a moderate electronic conductivity of 0.014 S/cm were obtained for the sample prepared at 220 °C for 4 h. It was observed that using inorganic precursors to prevent
particle agglomeration is more advantageous compared to organic precursors as mentioned in previous reports.
研究领域:
材料科学
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能源科学
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PubMed
高影响因子
Journal of Sulfur Chemistry
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2025
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IF 1.6
Yongpeng Ma,Jianghui Du,Haobing Yan,Chaobin Shi
Molybdenum disulfide (MoS2) is considered a favorable absorbent for removing heavy metals. However, due to its various morphologies, MoS2 exhibits significant differences in its performance for removing mercury from flue gas. In the present study, the flower-like, spherical MoS2 and W-MoS2 were prepared by regulating the interlayer spacing and doping tungsten (W) in MoS2 for removing gaseous mercury (Hg0). The results show that the number of active sulfur sites (S2- and S22-) was critical to the adsorption performance of MoS2 for Hg0. The flower-like MoS2 demonstrated optimum properties below 125°C which attributed to the presence of dominated S2- sites, while spherical MoS2 and W-MoS2 showed a wider application temperature range (up to 175°C) during Hg0 removal which attributed to the unsaturated sulfur S22- and active oxygen. In terms of the mechanism, Hg0 is directly inserted into the Mo-S bond of MoS2 to form a transition state [Hg·Mo]-S, and then the original Mo-S is interrupted to form a new β-Hg-S bond, or combine with surface oxidation to form HgO. The oxygen in the flue gas can supplement the surface active oxygen on the MoS2, which enables the circulation of Mo5+. Hg0 also reacted with S22- to form α-HgS.
研究领域:
环境科学
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材料科学
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jialing Shen,Guojun Lv,Juan Deng,Shihao Su,Fuxin Wang,Shengnan Xu,Lachgar Oussama,Zhongmin Liu
UiO-66 materials have the benefit of excellent stability, porosity, huge surface area, and presence of flaws, hence designing oxidative desulfurization (ODS) catalysts based on UiO-66 is very appealing. Herein, tungsten doped UiO-66 materials were synthesized with post-doping and in situ synthesis methods, and used as heterogeneous catalysts for the room-temperature oxidative desulfurization reactions. The successful doping of tungsten into the UiO-66 framework was demonstrated by FT-IR, UV–Vis, Raman and TGA characterizations. XAS characterization disclosed that tungsten element formed Zr-O-W bond on the defect sites for the tungsten doped UiO-66 materials. At the same time, the in situ synthesized W 2 @U-150 catalyst revealed the highest 98.5% of dibenzothiophene (DBT) elimination within 1h of desulfurization reaction as well as the biggest catalytic efficiency of 17727.3 h −1 mol −1 at room temperature due to its smallest band gap energy of 3.32 eV, highest tungsten content of 9.8 %, and most Lewis acid amount of 47.1 μmol/g. In addition, the synthesized W 2 @U-150 catalyst showed excellent re-usability for five cycles.
研究领域:
材料科学
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催化化学
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环境化学
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DOI
高影响因子
Small
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2024
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IF 13
Wansong Chen,Mang Niu,Zhaozuo Zhang,Lin Chen,Xing Li,Jinming Zhang,Ruoxin Sun,Haijie Cao,Xiaoxia Wang
Electrochemical hydrogen evolution reaction (HER) from water splitting driven by renewable energy is considered a promising method for large-scale hydrogen production, and as an alternative to noble-metal electrocatalysts, molybdenum carbide (Mo 2 C) has exhibited effective HER performance. However, the strong bonding strength of intermediate adsorbed H ( H ads ) with Mo active site slows down the HER kinetics of Mo 2 C. Herein, using phase-transition strategy, hexagonal β-Mo 2 C could be easily transferred to cubic δ-Mo 2 C through electron injection triggered by tungsten (W) doping, and heterointerface-rich Mo 2 C-based composites, including β-Mo 2 C, δ-Mo 2 C, and MoO 2 , are presented. Experimental results and density functional theory calculations reveal that W doping mainly contributes to the phase-transition process, and the generated heterointerfaces are the dominant factor in inducing remarkable electron accumulation around Mo active sites, thus weakening the Mo─H coupling. Wherein, the β-Mo 2 C/MoO 2 interface plays an important role in optimizing the electronic structure of Mo 3d orbital and hydrogen adsorption Gibbs free energy (Δ G H* ), enabling these Mo 2 C-based composites to have excellent intrinsic catalytic activity like low overpotential ( η 10 = 99.8 mV), small Tafel slope (60.16 dec −1 ), and good stability in 1 m KOH. This work sheds light on phase-transition engineering and offers a convenient route to construct heterointerfaces for large-scale HER production.
研究领域:
材料科学
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电催化
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理论计算
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Binghong Wu,Baoqian Yang,Xinru Wu,Dong-Hau Kuo,Zhengjie Su,Longyan Chen,Pengkun Zhang,Mengistu Tadesse Mosisa,Dongfang Lu,Zhanhui Yuan,Jinguo Lin,Xiaoyun Chen
Nitrogen fixation reaction via photocatalysis offers a green and promising strategy for renewable NH3 synthesis, and catalysts with high-efficiency photocatalytic properties are essential to the process. Herein, we demonstrate a W-doped Sb2OS2 bimetal oxysulfide catalyst (labeled as SbWOS) with abundant oxygen vacancies, heterovalent metal states, and hydrophilic surfaces for nitrogen photoreduction to ammonia. The SbWOS-3 with suitable W-doping exhibited excellent nitrogen fixation activity of 408.08 μmol·g–1·h–1 and an apparent quantum efficiency (AQE) of 1.88% at 420 nm and a solar-to-ammonia (STA) conversion efficiency of 0.082% in pure water under AM1.5G light irradiation. The W-doping not only transforms hydrophobic Sb2OS2 into a hydrophilic catalyst, making it easier for H2O molecules adsorbed on the SbWOS surface and catalyzed into protons, but also endows the SbWOS catalyst with rich oxygen vacancies, acting as the active sites for trapping and activating the N2 molecule, and for trapping and activating H2O to produce the protons for the N2 photocatalytic reduction reaction. The hydrazine drives the SbWOS catalyst with the heterovalent metal states, which acts as the photogenerate electrons quickly hopping between W5+ and W6+ to transfer for the N2 reduction reaction. This study provides a feasible scheme for applying oxygen vacancy defects, heterovalent metal states, and surface hydrophobic-to-hydrophilic wetting engineering in bimetal oxysulfide for N2 photoreduction to ammonia.
研究领域:
材料科学
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催化化学
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环境科学
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Yang Sun,Fan Yang,Siyuan Sun,Kexin Wei,Ye Wang,Guang Ma,Junpu An,Junwei Yuan,Meitong Zhao,Jiahui Liu,Hongchen Liu,Yongfeng Li
Developing high-performance and low-cost electrodes for hydrogen and oxygen evolution reactions (HER and OER, respectively) represents a pivotal challenge in the field of water electrolysis. Herein, W doped NiFe LDH nanosheets (NiFe-W x /NF) were immobilized on nickel foam (NF) through one-step corrosion engineering, which induced the coexistence of α-Ni(OH) 2 and β-Ni(OH) 2 . The doping of large atomic radius W influenced the growth of crystal planes of Ni(OH) 2 , promoting the formation of α-Ni(OH) 2 , which results in large layer spaces and neatly arranged nanosheets structure. The optimized NiFe-W 0.5 /NF catalyst require potentials of only 69 to attain 10 mA/cm 2 for HER, and require overpotentials of 269 mV to reach 100 mA/cm 2 current density for OER, respectively. The W 6+ with high oxidation state can withdraw neighboring electrons from Ni, altering the adsorption energy of hydrogen intermediates, which improves the Volmer step and electrical conductivity in HER. And the large layer space of α-Ni(OH) 2 in NiFe-W 0.5 /NF can be contributed to accelerating the formation of high valence γ-NiOOH, which can accelerate OER kinetics. In addition, the NiFe-W 0.5 /NF catalyst also provides an overall water splitting activity of 780 mA/cm 2 current density at a cell voltage of only 1.90 V, and remains highly stable for over 70 h at 100 mA/cm 2 , which makes it a bifunctional efficient catalyst for water electrolysis.
研究领域:
材料科学
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电化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Chundong Liu,Yulong Xiang,Xiaoli Dong,Yu Wang,Jialin Niu,Nan Zheng
Photocatalytic nitrogen (N 2 ) reduction reaction for solar energy conversion encounters considerable challenges due to the inadequate performance of semiconductor photocatalysts. The role of metal cation vacancies in photocatalytic nitrogen fixation is rarely explored. Here, we report a facile strategy to construct BiOCl nanosheets with tunable Bi-vacancy via tungsten doping. W-doped energy levels and Bi vacancies (V Bi ) can effectively tune the energy band structure of BiOCl, thereby broadening the range of light absorption and enhancing carrier transport. Density functional theory (DFT) calculation results reveal that the doped W 6+ can act as the main activation sites of nitrogen for N≡N elongation, and the Bi vacancies are the main adsorption sites with the strongest nitrogen adsorption energy. This results in the formation of dual active sites for nitrogen adsorption and activation. W-BiOCl-2 showed excellent nitrogen fixation efficiency of 1016.6 μmol h −1 g −1 , which was 2.6 times higher than that of pristine BiOCl without any sacrificial agents. This study provides a promising strategy for the design of high-performance photocatalytic N 2 fixation catalysts with multiple active sites.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Li Peng,Zhaofeng Duan,Shumin Cen,Xuehong Gu
High-silica CHA (SSZ-13) zeolites membranes, with pore size between the molecular size of CO 2 and N 2 or CH 4 , are promising for some industrial CO 2 separation process. Considering water is typically present in these industrial gas feed and the negative impact of moisture on the membranes’ gas permeation, it is highly desirable to increase the surface hydrophobicity of membranes to reduce the adsorption of water. In this paper, a W-doping strategy was proposed to increase the hydrophobicity of SSZ-13 membranes by eliminating the silanols on the surface, and the W-doped high-silica CHA (W-SSZ-13) zeolite membranes were prepared for the first time. Characterizations such as SEM, XRD, and XPS confirmed the successful incorporation of W into CHA membrane. The incorporation of W reduced the pore mouth size, and the W-SSZ-13 zeolite membranes showed improved CO 2 /N 2 and CO 2 /CH 4 separation performance. After W-doping, the maximum separation factors ( α max ) for the CO 2 /N 2 mixture with equimolar composition under dry conditions increased from 8.8 to 16.9, and for the equimolar CO 2 /CH 4 mixture, the value increased from 105.9 to 176. The W-SSZ-13 membranes also showed better separation performance under wet conditions. For both systems, the W-SSZ-13 membrane showed higher α max and less CO 2 permeance reductions, indicating a more resistance in wet conditions.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jingxuan Wu,Song Zou,Bo Wang,Changhao Feng,Tatsuo Yoshinobu
Acetone not only harms the human body but is also considered a diabetes biomarker. A series of acetone-sensitive W-doped ZnFe 2 O 4 composite nanofibers were successfully prepared in this study using a simple single-spinneret electrospinning method and a 600 °C calcination treatment. The crystalline phase, morphology, and elemental composition of ZnFe 2 O 4 nanofibers with varying levels of W doping were systematically characterized and analyzed. The gas-sensitive sensing properties of the nanofibers were also thoroughly investigated. The results demonstrate that W is successfully doped into the ZnFe 2 O 4 lattice, leading to a significant reduction in the crystallite size that composes the nanofibers and the formation of Fe 2 O 3 olive-shaped nanoparticle embellishments on the surface of nanofibers. Meanwhile, the generation of heterojunctions and reduction of crystallite size significantly enhance the sensitivity and selectivity of ZnFe 2 O 4 to acetone vapor. The sensors based on 6 mol% W-doped ZnFe 2 O 4 composite nanofibers, in particular, exhibit a response of up to 1.95 for 0.125 ppm acetone vapor at 200 °C. Finally, a comprehensive examination of the acetone sensing mechanism of W-doped ZnFe 2 O 4 is performed, as well as the potential causes for morphological changes and heterojunctions to improve the gas-sensitive performance of ZnFe 2 O 4 .
研究领域:
材料科学
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传感器技术
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医学检测
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Jun Cai,Yi Xia,Ruiqi Gang,Sufang He,Sridhar Komarneni
Defect engineering and heterogeneous doping are considered as the effective routes to improve the photocatalytic activity of MoS 2 . In this study, tungsten was used to produce sulfur defects and tungsten doping on MoS 2 by one step hydrothermal treatment. Tungsten doping not only promotes the formation of sulfur defects, but also accelerates the efficiency of separation and transfer of electron-hole pairs, which enables the samples to maintain high catalytic oxidation activity for a long time. Furthermore, comparative experiments show that sulfur defects can promote the activation of O 2 and the formation of more active O 2 - and ·OH species. As a result, the W-doped MoS 2 exhibited a high removal efficiency of more than 99% of gaseous mercury. In addition, W-doped MoS 2 showed good stability, long term durability, enhanced water and sulfur resistance under light illumination. This work provides a novel direction for designing efficient photocatalysts based on transition metal dichalcogenides.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ze Liu,Yadong Hu,Chengkai Li,Zhenyu Zhang,Tingzhe Shen,Danni Zeng,Rongfeng Guan,Changjian Zhou,Pengyu Dong
Photocatalysis technology can degrade organic pollutants in wastewater, improving the ecological environment and protecting biodiversity. The BiVO 4 stable chemical properties of BiVO 4 make it a robust candidate for photochemical applications. Moreover, its broad light absorption spectrum and optimal band structure further enhance its potential, driving widespread research interest. The introduction of the eco-friendly biperovskite Cs 2 AgBiBr 6 enhanced BiVO 4 ′s surface area and visible light absorbance. Simultaneously, the doping process introduces impurities that modify charge transfer pathways, thereby enhancing the separation efficiency of photogenerated electron-hole pairs. When contrasted with pure BiVO 4 , the W-BiVO 4 /Cs 2 AgBiBr 6 composite demonstrates superior surface area characteristics and exhibits stronger absorption within the visible light spectrum. Within 40 min after exposure to visible light, the efficiency of W-BiVO 4 /Cs 2 AgBiBr 6 photocatalyst to degrade ofloxacin (OFX) and meloxicam (MEL) was 93.15 % and 92.70 %, respectively. Based on the toxicity analyses and antimicrobial assays simulated by the software, no highly toxic substances were found in the degradation intermediate products of OFX and MEL. The catalysts’ energy band structure and photoelectrochemical properties showed that W-BiVO 4 /Cs 2 AgBiBr 6 followed the S-scheme heterojunction charge transfer mechanism. By integrating BiVO 4 with other semiconductors in the form of S-scheme heterojunctions, this study explores a strategy that may effectively improve photocatalytic efficiency, particularly in pollutant degradation applications.
研究领域:
环境科学
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材料科学
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高影响因子
危险品化学品经营许可证（带存储）