IONICS
·
2017
·Vol. 24
·期 9
·2583-2590
·
IF 2.062
Wang Xiaoqing,Yin Mingyue,Xue Huidong,Su Yu,Tian Songran
Niobium-doped MnO 2 /reduced graphene oxide (Nb-MnO 2 /RGO) composite has been successfully synthesized via a simple microwave radiation method. The samples were systematically studied by X-ray diffraction (XRD), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and electrochemical measurements. As the anode material for lithium-ion batteries, the Nb-MnO 2 /RGO (molar ratio of Mn/Nb = 50:1) (NMG50) showed an outstanding reversible discharge capacity of 556.6 mAh g −1 after 50 cycles with a capacity retention of 77% at a charge-discharge rate of 0.1 A g −1 and the reversible discharge capacity can still retain 223.3 mAh g −1 at a current of 1 A g −1 , which is much higher than those for Nb-MnO 2 /RGO (molar ratio of Mn/Nb = 10:1) (NMG10) and undoped MnO 2 /RGO (MG). The improved electrochemical performance could be attributed to the proper amount of Nb doping, which could enhance both the conductivity and the structure stability of MnO 2 .
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yanli Wang,Can Liu,Xinyue Jiang,Yufei Cheng,Jie Wang,Lingxu Yang,Huijun Liu,Chaoliu Zeng
Coatings deposited via the disproportionation reaction of multivalent transition-metal ions in molten salts offer advantages of simple apparatus, straightforward processing, and the formation of metallurgically bonded interfaces with the substrate. In this study, high-quality niobium carbide and nitride coatings were fabricated for proton exchange membrane fuel cell (PEMFC) bipolar plates via disproportionation of Nb(IV) in molten salts. The effect of fluoride ions in the molten salt medium on the composition, microstructure, and properties of coatings deposited on austenitic stainless steel substrates was investigated. Results show that the addition of fluoride ions to NaCl-KCl molten salt effectively modulates the disproportionation rate of Nb(IV), enabling the formation of uniform and dense Nb x (C,N) y coatings on 304 SS. This regulation prevents excessive disproportionation of Nb(IV) and the consequent accumulation of niobium particles, which would otherwise accelerate the corrosion of the coating under galvanic conditions. Regular electrochemical tests demonstrated that the Nb x (C,N) y coating significantly improved the corrosion resistance of 304 SS. Moreover, even under an elevated potential of 1.0–1.6 V vs. SHE, the corrosion current density stayed below the target set of United States Department of Energy (1 μA·cm −2 ), without significant fluctuations. This demonstrates that the coating possesses outstanding chemical stability and long-term corrosion resistance.
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高影响因子
Crystals
·
2023
·Vol. 14
·期 1
·14
·
IF 2.7
Yufei Zu,Zi Wang,Hongliang Tian,Fan Wu,Lianshen Fu,Jixiang Dai,Jianjun Sha
High-entropy diboride-based (MeB2-based) ceramics are promising high-temperature structural materials because of their excellent mechanical properties, high-temperature stability, and oxidation resistance. In order to achieve low-temperature sintering of the high-entropy ceramics, a novel preparation method of high-entropy (Ti,Zr,Nb,Mo,W)B2-SiC ceramics based on reactive sintering of pre-alloyed solid-solution metals and nonmetals of Si, C, B4C was conducted in the current work. Mechanical alloying behavior of the mixed metal powders, as well as the phase composition, microstructure, mechanical properties, and oxidation behavior of the as-sintered MeB2-SiC ceramic were investigated. The XRD, SEM, and EPMA results indicated that the primary MeB2solid-solution and SiC phases could be successfully formed during reactive sintering at a relatively low temperature of 1650 °C. The as-sintered MeB2-SiC ceramics had a high relative density of 97.8% and high mechanical properties (hardness of 19.74 ± 0.8 GPa, flexure strength of 533 ± 38 MPa, and fracture toughness of 6.01 ± 0.77 MPa·m1/2). Combining the oxidation behavior and microstructure evolution of the oxidation layer, a continuous and relatively dense MeOx-SiO2oxidation layer was gradually formed and covered on the external surface, leading to decelerating oxidation behavior after an oxidation exposure time of 10 min.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Meiqi Li,Ling Li,Xinyi Zhang,Qiong Yuan,Benkai Bao,Yanli Tang
High expression of drug efflux pump makes antibiotics ineffective against bacteria, leading to drug-resistant strains and even the emergence of “superbugs”. Herein, we design and synthesize a dual functional o-nitrobenzene (NB)-modified conjugated oligo-polyfluorene vinylene (OPFV) photosensitizer, OPFV-NB, which can depress efflux pump activity and also possesses photodynamic therapy (PDT) for synergistically overcoming drug-resistant bacteria. Upon light irradiation, the OPFV-NB can produce aldehyde active groups to covalently bind outer membrane proteins, such as tolerant colicin (TolC), blocking drug efflux of bacteria. The minimum inhibitory concentration of antibiotic model chloramphenicol (CHL) is reduced about 64 times, significantly resensitizing drug-resistant bacteria to antibiotics. Also, the probe can produce highly efficient reactive oxygen species (ROS) under light irradiation. Consequently, the unimolecular OPFV-NB-based system demonstrates insusceptibility to antibiotic resistance while maintaining significant antimicrobial effects (100%) against drug-resistant bacteria. More importantly, in vivo assays corroborate that the combined system greatly accelerates wound healing by eradicating the bacterial population, dampening inflammation, and promoting angiogenesis. Overall, the OPFV-NB not only counteracts antibiotic resistance but also holds tremendous PDT efficiency, which provides a promising therapeutic strategy for combating drug-resistant bacteria and treating bacteria-infected wounds.
研究领域:
微生物学
·
药理学
·
治疗学
·
生物医学工程
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ting Wang,Ting Xu,Shang Gao,S.-H. Song
BiFeO 3 , BiFe 0.95 Nb 0.05 O 3 and Bi 1− x Nd x Fe 0.95 Nb 0.05 O 3 ( x =0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles are successfully synthesized via a tartaric acid-assisted sol-gel technique for the first time. The effect of Nd and Nb co-doping on the structure, morphology, and magnetic and optical properties is investigated. X-ray diffraction (XRD) and Raman measurements demonstrate that Nd 3+ ions and Nb 5+ ions co-doping at A and B-sites of BiFeO 3 can result in a structural transformation (from single rhombohedral phase ( R 3 c ) to two coexisting phases ( R 3 c and Pbam)). The morphology of the nanoparticles seems to be approximately cubic, and by the co-doping, the size of the nanoparticles decreases from ~132 to ~35 nm. Notable improvement in the remanent magnetization of the sample with x =0.15 is observed with a value of 0.285 emu/g, being 20 times higher than that of the undoped sample (BiFeO 3 ). A decrease in the optical band gap is also observed in the Nd and Nb co-doped nanoparticles, indicating their favorable potential in photocatalytic applications.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Xiaochen Wu,Yongtao Zhao,Rui Yang,Jiaxuan Feng,Sujuan Cheng,Ning Liu,Teng Long,Pengchao Si
Silicon anodes for advanced lithium-ion batteries (LIBs) are promising due to intrinsic advantages including ultrahigh theoretical capacity (4200 mAh g −1 ), near-optimal Li + /Li potential (∼0.4 V), abundant availability and environmental benignity. However, practical application is hindered by severe intrinsic challenges: drastic volume expansion (>300%), unstable solid-electrolyte interphase (SEI) formation, and sluggish reaction kinetics. To address these limitations, we fabricated a novel Si@T-Nb₂O₅@Carbonized-coxial carbon nano fiber composite via a scalable hydrothermal-electrospinning approach, featuring silicon nanoparticles encapsulated in a nitrogen-doped porous carbon matrix with an engineered T-Nb₂O₅ interphase layer. Theoretical simulations demonstrate that the T-Nb₂O₅ interphase promotes Li + diffusion and reduces the energy barrier at carbon/Si interfaces. The optimized electrode exhibits excellent cycling stability and high-rate performance (1030.1 mAh g −1 after 100 cycles at 0.2 A g −1 ; 507.7 mAh g −1 after 500 cycles at 2.0 A g −1 ). Notably, flexible pouch cells maintain stable LED illumination under repeated mechanical deformation, indicating great practical potential. This integrated electrospinning strategy provides a scalable manufacturing platform for high-energy flexible batteries.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117844
·
IF 6.2
Zhuangzhuang Ma,Yunhao Wang,Tianhao Rui,Yulin Lan,Linyuan Lu,Yang Yu,Mingxuan Deng,Tianxing Lan,Zhekang Zhao,Zhen Teng,Haibin Zhang
High-entropy pyrochlore ceramics with the nominal composition Eu 2 B 2 O 7 , incorporating up to five equiatomic B-site cations, were synthesized via a solid-state reaction method and evaluated their aqueous chemical durability for nuclear waste immobilization. Comprehensive characterization using XRD, Raman, and SEM analyses confirmed the formation of a single-phase pyrochlore structure with uniform and random elemental distribution. However, secondary phases were observed in the Ce- and Nb-doped samples, which is attributed to the larger ionic radius of Ce and the higher valence state of Nb. The 42 days leaching tests revealed normalized element release rates ranging from 10 −5 to 10 −7 g/(m 2 ∙d), significantly lower than those of conventional pyrochlore materials. This enhanced durability is attributed to synergistic effects of electronegativity, ionic radius, and atomic number, which together hinder cation diffusion and strengthen chemical durability at the B site. These findings demonstrate the potential of Eu 2 B 2 O 7 high-entropy pyrochlore ceramics as long-term host materials for high-level radioactive waste. This study provides a valuable resource for enriching the thermophysical properties database of B-site high-entropy pyrochlore solidification, thereby supporting their engineering development.
研究领域:
材料科学
·
核化学
·
无机非金属材料
·
放射性废物处理
·
固体化学
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DOI
高影响因子
Catalysts
·
2015
·Vol. 5
·期 4
·1636-1648
·
IF 2
Rui Wang,Xiaolin Xie,Yanxiu Liu,Zhigang Liu,Guofang Xie,Ning Ji,Lizhi Ma,Mingquan Tang
The kiwifruit industry is booming worldwide. As a result, a great deal of kiwifruit waste residue (KWR) containing monosaccharides is produced and discarded. This material shows great potential for the production of platform chemicals. In this study, a series of Nb/Al oxide catalysts were synthesized via a facile and low-cost coprecipitation method, and their structures were characterized using: thermal gravimetric analysis (TGA), XRD, FESEM, TEM, X-ray photoelectron spectroscopy (XPS), NH3-TPD, N2adsorption-desorption, and FTIR-Pyridine adsorption. Experimental results of sugar-to-levulinic acid (LA) conversion revealed that the 20%Nb/Al oxide catalyst provided the highest catalytic performance and durability in terms of LA yield from fructose (74.2%) at 463 K after 10 min and from glucose (47.5%) at 473 K after 15 min. Notably, the 20% Nb/Al oxide catalyst with a 10% dosage is capable of converting kiwifruit waste residue to LA at 473 K after 10 min. In conclusion, the enhanced catalytic performance was obtained due to the high acidity, and large surface areaof Nb/Al oxide catalyst.Keywords:levulinic acid;kiwifruit waste residue (KWR);heterogeneous catalysis;Nb/Al oxide catalyst
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 1
·118754
·
IF 6.3
Junyao Wu,Sai Liu,Shenxiang Luo,Jinwei Guo,Haonan Shi,Fan Zhang,Wang Zhu
High-entropy A 6 B 2 O 17 (A = Hf, Zr; B = Ta, Nb)/8YSZ double-layer ceramic coatings with three compositions are fabricated by atmospheric plasma spraying (APS). Thermal cycling tests are performed at 1150 °C with a 5 min heating hold followed by 5 min air cooling, while isothermal oxidation tests are performed at 1150 °C. Among the three coatings, H 3 Z 1 T 2 N 1 coating exhibits the longest thermal cycling lifetime (1823 ± 153 cycles), followed by the H 1 Z 1 T 2 N 1 coating (1123 ± 136 cycles) and H 1 Z 3 T 2 N 1 coating (826 ± 114 cycles). After 180 h oxidation, the thermally grown oxide (TGO) thicknesses are 5 μm, 5.6 μm, and 6.6 μm, respectively. The H 3 Z 1 T 2 N 1 coating possesses the lowest oxidation rate constant ( k p = 0.1263 μm 2 ·h −1 ). This superior performance is attributed to dense vertical cracks induced by higher thermal expansion, which relieve thermal stress, suppress oxygen ingress, and delay interfacial failure.
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高影响因子
Materials
·
2026
·Vol. 19
·期 8
·1500
·
IF 3.7
Kaibo Zhu,Jie Wang,Biju Zheng
HighlightsWhat are the main findings?Coating hardness rises monotonically with Nb content, reaching 470.36 HV atx= 1.00.Optimal as-sprayed tribological performance occurs at Nbx= 0.75 with the lowest wear rate.500 °C annealing achieves peak hardness (477.45 HV) and 45% lower wear rate than as-sprayed.What are the implications of the main findings?This work provides a substrate-compatible protective coating strategy for ductile iron components.Nb content-annealing synergistic regulation guides wear-resistant HEA coating design.Low-temperature annealing avoids substrate degradation while enhancing coating performance.Ductile iron suffers from insufficient wear resistance under heavy-load service conditions. Surface engineering technologies offer effective solutions to this problem. However, current research on the application of atmospheric plasma-sprayed (APS) CoCrFeNiNbxhigh-entropy alloy (HEA) coatings on ductile iron and the systematic study of compatible heat treatment processes with the substrate are still insufficient. In this study, CoCrFeNiNbxHEA coatings (x= 0.25, 0.50, 0.75, 1.00) were deposited on QT800-5 ductile iron by APS, and the effects of Nb content and low-temperature annealing (400–600 °C) on coating microstructure and properties were investigated. Thex= 0.25 coating exhibited a single face-centered cubic (FCC) solid solution structure, while coatings withx≥ 0.50 comprised an FCC solid solution and Cr2Nb-type Laves phase; hardness increased with Nb content, and as-sprayed wear resistance peaked atx= 0.75. Post-deposition annealing at 500 °C yielded a peak hardness of 477.45 HV and reduced the wear rate by 45% relative to the as-sprayed condition, with no measurable degradation of the substrate. These findings offer a practical reference for developing wear-resistant coatings on ductile iron components.
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Hongbin An,Ruoyu Chen,Saisai Li,Lingfeng Huang,Wenbao Jia,Qianfang Wu,Aiqing Mao
Powder synthesis is crucial for achieving the densification and facilitating widespread applications of high entropy carbide (HEC). Specifically, the production of fine particle-size powders is essential to enhance the densification of HECs. Consequently, this paper proposes the molten salt method for synthesizing HEC powders. The synthesis process successfully yielded (Ta Nb Ti V) C powders with a particle size of only 0.44 µm at 1400°C, exhibiting a uniform distribution of each element. Subsequent densification of (Ta Nb Ti V) C within the 1700–1900°C temperature range was carried out using spark plasma sintering. It was observed that as the densification temperature increased, the densification and mechanical properties of HEC significantly improved. This study presents innovative ideas for the preparation of HEC at lower temperatures.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
GREEN CHEMISTRY
·
2026
·
IF 10.6
Danni Liu,Kaige Zhang,Wenli Zhao,Xiaopo Niu,Xiangwen Zhang,Qingfa Wang
To address the challenges of complex separation and high energy consumption in producing high-density biofuels from biomass, developing high-efficiency bifunctional catalyst to integrate carbon-carbon coupling and hydrodeoxygenation processes is highly desired. Herein, a bifunctional catalyst with RuOx anchored on the edge of NbOPO4 nanosheets was successfully fabricated through an impregnation-calcination method, enabling one-pot solvent-free conversion of lignin-derived phenol and benzyl alcohol into polycycloalkane perhydrofluorene. The NbOPO4 nanosheet edges were enriched in oxygen vacancies and were prone to anchoring RuOx species preferentially. The optimized 3%RuOx/NbOPO4 exhibited abundant Ru-O-Nb interfacial species, which synergized with Brønsted acid sites (BASs) to enhance the alkylation performance. The in-situ generated Ru0 species from the Ru-O-Nb interfacial species exhibited superior hydrogen dissociation capability, then the synergistic interaction with BASs through hydrogen spillover significantly boosted the hydrodeoxygenation efficiency. 3%RuOx/NbOPO4 with more Ru-O-Nb interfacial species exhibited high conversion of benzyl alcohol (98%) and yield towards perhydrofluorene (72%) under mild conditions (160 °C, 3 h) with a low environmental E-factor (≤2.8). Mechanistic studies identified the cyclization hydrogenation of oxygenated intermediates as the rate-determining step, and the product dicyclohexylmethane was mainly formed from the selective ring opening of perhydrofluorene over the synergy metal-acid sites of 3%RuOx/NbOPO4. This study provides a deep insight into designing efficient bifunctional catalysts for sustainable aviation fuel production through process integration.
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高影响因子
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