CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Ya-Nan Zhou,Fu-Li Wang,Shu-Yue Dou,Zhuo-Ning Shi,Bin Dong,Wen-Li Yu,Hui-Ying Zhao,Feng-Ge Wang,Jian-Feng Yu,Yong-Ming Chai
High-valence Nb has been proved to be promising to enhance oxygen evolution reaction (OER). However, how to realize the atomic doping of larger-radii Nb is challenging. Herein, an elaborate molten salt method is applied to rapidly incorporate Nb into NiFe-layered double hydroxides (Nb-NiFe-LDH). The fabricated Nb-NiFe-LDH is featured with nano pompons composed of cross-linked hollow nanotubes, which ensures maximum exposure of active sites. Meanwhile, the generated lattice defects can adjust electron density and absorption property of intermediates on the surface, facilitating oxygen evolution. As validation, the obtained Nb-NiFe-LDH exhibits motivated OER activity with overpotential of 242 mV at 50 mA cm −2 and small Tafel slope of 31.3 mV dec −1 as well as long-term stability of 73 h. DFT reveals that such superior OER performance benefits from the fine-tuned surface adsorption ability for reaction intermediates and electron transfer capability as well as optimized oxidation cycle of active metals by synergistic Nb and defects. This work is expected to provide deep insights into the advanced catalysts development via high-valence metal doping achieved by molten salt method.
研究领域:
材料科学
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电化学
·
催化
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Chen Hou,Yi-Ran Xing,Le-Le Yu,Yong-Heng Si,Han Lu,Yu-Juan Zhao
Fe–Mn based Li-rich cathode materials are regarded as one of the most promising cathode materials for their low cost and high energy density but possess drawbacks such as high oxygen release, low conductivity, and slow kinetics for lithium-ion transport. To address these issues, herein, we proposed a high-valance cations Nb 5+ doping strategy and synthesized a series of Li 1.26 [Fe 0.22 Mn 0.52 ] 1−x Nb 0.74x O 2 ( x = 0, 0.02, 0.03, 0.04) cathode materials. Using a combination of experimental approaches and density functional theory (DFT) calculations, we found that the doped samples presented expanded interlayer spacing for Li-ion migration and better structural stability due to the large ionic radius of Nb 5+ and the strengthened Nb–O bond. Moreover, Nb doping could not only decrease the band gap and the density of states of the O 2p band but also contribute extra electrons to surrounding O atoms, thereby enhancing electronic conductivity and stabilizing lattice oxygen. Benefit from the underlying mechanisms mentioned above, the Nb 0.022 sample possessed a higher Coulombic efficiency (71.1 vs 65.0%) at 0.2 C, showing more stable cycling performance (90.4 vs 67.7 mAh g −1 ) at 0.5 C and rate capability. These favorable results can assist in the development of Fe–Mn based Li-rich cathode materials with excellent electrochemical properties.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2017
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IF 4.339
Baohuai Zhao,Rui Ran,Xingguo Guo,Li Cao,Tengfei Xu,Ze Chen,Xiaodong Wu,Zhichun Si,Duan Weng
Mn/Ce/Ti and Mn/Ce/Nb/Ti catalysts were synthesized using a precipitation method and their catalytic activities for NO selective reduction with NH 3 at low temperatures were evaluated. Nb doping not only improved the activity of the catalyst over a wide temperature range but also restricted the generation of NO 2 and N 2 O. The Mn/Ce/Nb/Ti catalyst displayed 100% NO conversion from 150 to 250 °C and >90% N 2 selectivity below 250 °C. The specific surface area of the catalyst was increased and its surface acidity was strengthened after Nb doping. Moreover, Nb doping increased the NO oxidation ability and lowered the NH 3 oxidation activity of the catalyst. All the above factors contributed to enhancing the overall NH 3 -SCR performance of the Mn/Ce/Nb/Ti catalyst compared with that of the Mn/Ce/Ti one. The long-term stability and resistance to H 2 O and SO 2 of the Mn/Ce/Nb/Ti catalyst were also evaluated.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 27
·7885-7895
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IF 4.478
Zhang Xiaoya,Feng Quanshou,Xie Zehu,Xu Fuxing,Yan Yinghua,Ding Chuanfan
In this work, on the basis of an immobilized metal ion affinity chromatography enrichment strategy, a new kind of covalent organic framework (COF) material for enrichment of phosphorylated peptides and exosomes was successfully prepared in a facile method, and Ti 4+ and Nb 5+ were used as dual-functional ions (denoted as COF-S–S-COOH-Ti 4+ /Nb 5+ ). With the advantage of unbiased enrichment towards phosphopeptides, COF-S–S-COOH-Ti 4+ /Nb 5+ shows ultra-high selectivity (maximum molar ratio of β -casein: BSA is 1:20,000) and low limit of detection (0.2 fmol). In addition, the material has an excellent phosphopeptide loading capacity (100 μg/mg) and reusability (at least seven times). Furthermore, applying the material to the actual sample, 4 phosphopeptides were selectively extracted from the serum of renal carcinoma patients. At the same time, exosomes with an intact structure in the serum of renal carcinoma patients were successfully isolated rapidly using this strategy. All experiments have shown that COF-S–S-COOH-Ti 4+ /Nb 5+ exhibits exciting potential in practical applications. Graphical abstract
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Tao Guo,Fang-You Yan,Yao-Feng Wang,Xiao-Feng Xu,Qing-Zhu Jia,Bao-Hua Xu
To reach highly active and selective gas-phase nitrilation of dimethyl adipate (DMA) with NH 3 , a series of Nb x W 10-x (x = 10, 9, 7, 5 and 0) composite were fabricated by a sol–gel method to approach the homogeneous combination of NbO x and WO x . As a result, the single-pass yield of adiponitrile (ADN) reached 85.2% over Nb 9 W 1 under lower reaction temperature and lower NH 3 /DMA molar ratio. Consequently, the space–time yield (STY) of ADN over Nb 9 W 1 was 1.7 ∼ 30 times higher than that of previous catalysts. Mechanistic experiments demonstrated the activity strongly correlates the interaction between the carbonyl functionality and the composite. Further, a significant synergistic effect between W and Nb was disclosed, wherein the Nb-based domains account for activating DMA while the W-based domains mainly adsorb and activate NH 3 feedstock.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 45
·期 15
·117640
·
IF 6.2
Li Xu,Wei Liao,Xiaosong Zhou,Yongqiang Tan
The influences of Cr 3 C 2 addition on phase formation, microstructures and mechanical properties of (Zr,Ti,Nb,Ta,Hf)C prepared from binary carbides mixtures by spark plasma sintering were studied. The introduction of 4/3 mol.% Cr 3 C 2 significantly lowered the minimum temperature for uniform high-entropy phase (Zr,Ti,Nb,Ta,Hf)C from 2200 °C for to 1900 °C. The lower solubility limit of Cr in (Zr,Ti,Nb,Ta,Hf,Cr)C results in excessive Cr 3 C 2 -based carbides, which tends to segregate along grain boundaries at higher sintering temperatures while locate at triple junctions at lower sintering temperatures . High mechanical strength of 599 MPa were obtained when 4/3 mol.% Cr 2 C 3 was added and sintered at 1900 °C. The fine grain size and Cr 3 C 2 -based carbides are responsible for the high mechanical properties. More Cr 2 C 3 addition results in lower mechanical properties due to excessive Cr 3 C 2 -based carbides.
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DOI
高影响因子
DENTAL MATERIALS
·
2021
·
IF 5.304
Danlei Zhao,Haoran Dong,Yuting Niu,Wenjie Fan,Muqi Jiang,Ke Li,Qingsong Wei,William M. Palin,Zhen Zhang
Objective Guided bone regeneration (GBR) techniques use barrier membranes to augment the alveolar ridge for the site-specific growth of bone defects. However, current approaches using cast metal substructures exhibit poor adaptation to the surgical site and increased risk of infection. This study aimed to fabricate multi-functional coatings with 3D-printed porous titanium-niobium (Ti-Nb) alloy meshes to maintain space, prevent the ingrowth of fibroblasts and inhibit the colonization of bacteria for GBR. Methods Ti-Nb alloy meshes were prepared by selective laser melting (SLM) and used as substrates for novel surface coatings. Porous chitosan (CS)/ gelatin (G)/ doxycycline (Dox) coatings were formed on the meshes using electrophoretic deposition (EPD) and freeze-drying. The process of EPD was characterized through Fourier transform infrared spectroscopy (FT-IR), zeta potential, and particle size analysis. The cytotoxicity of the coatings was evaluated through the culture of osteoblasts and immunostaining. The antibacterial activity of the coatings was tested using inhibition zone tests against Staphylococcus aureus ( S. aureus ) and scanning electron microscope (SEM). The inhibition of fibroblasts infiltration and nutrients transfer properties were analyzed using immunostaining and permeability tests. Results High yield strength (567.5 ± 3.5 MPa) and low elastic modulus (65.5 ± 0.2 GPa) were achieved in Ti-Nb alloy bulk samples. The data of zeta potential, FT-IR and SEM indicated that porous spongy coatings were chemically bonded following EPD. In vitro analysis of CSGDox1 (containing Dox at 1 mg·mL −1 ) coating revealed its antibacterial effect and biocompatibility. Moreover, the CSGDox1 coating was proved to be effective for preventing the ingrowth of fibroblasts, whilst allowing the infiltration of nutrients. Significance This study verified that the EPD of CSGDox coatings on the 3D-printed Ti-Nb meshes can maintain space, provide antibiotic release whilst maintaining a barrier against soft-tissue growth, which is essential for the success of GBR treatment.
研究领域:
生物材料学
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口腔医学
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组织工程学
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DOI
PubMed
高影响因子
Translational Psychiatry
·
2023
·Vol. 13
·期 1
·1-12
·
IF 6.8
Yan Yan,Song Da,Jin Yue,Deng Yujun,Wang Chunjian,Huang Tao,Tang Yuanhong,Yang Yu,Zhang Yun,Wang Zhe,Dong Zhifang,Wang Yuetian,Zhao Juan,Ni Junjun,Li Hui,Zhang Jun,Lang Yiran,Wu Yili,Qing Hong,Quan Zhenzhen
Animals need discriminating auditory fear memory (DAFM) to survive, but the related neural circuits of DAFM remain largely unknown. Our study shows that DAFM depends on acetylcholine (ACh) signal in the auditory cortex (ACx), which is projected from the nucleus basalis (NB). At the encoding stage, optogenetic inhibition of cholinergic projections of NB-ACx obfuscates distinct tone-responsive neurons of ACx recognizing from fear-paired tone to fear-unpaired tone signals, while simultaneously regulating the neuronal activity and reactivation of basal lateral amygdala (BLA) engram cells at the retrieval stage. This NB ACh -ACx-BLA neural circuit for the modulation of DAFM is especially dependent on the nicotinic ACh receptor (nAChR). A nAChR antagonist reduces DAFM and diminishes the increased magnitude of ACx tone-responsive neuronal activity during the encoding stage. Our data suggest a critical role of NB ACh -ACx-BLA neural circuit in DAFM: manipulation of the NB cholinergic projection to the ACx via nAChR during the encoding stage affects the activation of ACx tone-responsive neuron clusters and the BLA engram cells during the retrieval stage, thus modulating the DAFM.
研究领域:
神经科学
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行为神经科学
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认知神经科学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Patima Nizamidin,Huifang Chen,Yanmei Li
Gas adsorption selectivity improvement of a metal–organic framework (MOF)-based sensor presents a significant challenge. This study addresses the enhancement of gas adsorption selectivity in MOFs by introducing bimetallic centers. The bimetallic zinc/niobium MOF (Zn/Nb–NDI–BMOF) was synthesized through the solvothermal coordination of Zn and Nb metal sources with the 1,4,5,8-naphthalene tetracarboxydiimide (NDI) organic ligand. Zn/Nb–NDI–BMOF formed a hexagonal-platelet structure with a high refractive index and optical transparency after 5 h of solvothermal growth. In comparison to Zn–NDI–MOF and Nb–NDI–MOF, the developed Zn/Nb–NDI–BMOF film displayed a unique response to H2S in the presence of SO2, NO2, CO2, and HCl gases when incorporated into an optical waveguide sensor (OWGS). The enhancement in the gas-sensing selectivity of Zn/Nb–NDI–BMOF can be attributed to the bimetallic synergistic effect, which alters the framework structure and pore sizes and consequently modifies the optical configuration and activity. Upon exposure to H2S, it is susceptible to proton transfer between H2S and Zn/Nb–NDI–BMOF. Features such as a fast response (response time less than 2 s), a wide detection range (100 ppm to 1 ppb), good reproducibility, a low detection limit (0.69 ppb), thermal stability, and humidity resistance of the Zn/Nb–NDI–BMOF film OWGS for H2S make it a promising candidate for potential applications in environmental monitoring and food freshness assessment.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Bei-Chen Gao,Yu Tian,Run-Ping Liu,Yi-Xin Wang,Yang You,Wei-Ming Guo,Hua-Tay Lin
A two-step method including low-temperature pretreatment and high-temperature homogenization was developed to prepare high-purity (Ti 0.2 V 0.2 Ta 0.2 Nb 0.2 Hf 0.2 )(C 0.75 N 0.25 ) powder. In the first step, the reaction mixture was heated to 1450 ℃ to form intermediate carbonitride phases through carbothermal reduction-nitridation, and the second step at 1700 ℃ produced a single-phase high-entropy carbonitride. The powder prepared by single-step treatment at 1750 ℃ contained 2.28 wt% nitrogen and 0.18 wt% oxygen. In contrast, the two-step powder exhibited higher nitrogen content (2.45 wt%) and lower oxygen content (0.09 wt%), and the formation of a complete single-phase solid solution enabled accurate calculation of its composition (Ti 0.2 V 0.2 Ta 0.2 Nb 0.2 Hf 0.2 )(C 0.78 N 0.21 O 0.01 ). The ceramic prepared from the two-step powder achieved 99.8% relative density, with an average grain size of 4.58 ± 0.32 μm, a Vickers hardness of 22.73 ± 0.51 GPa, and a fracture toughness of 3.16 ± 0.30 MPa·m 1/2 , whereas the single-step ceramic reached only 86.5% relative density.
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DOI
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Qing Li,Zichao Xia,Man Huang,Miao Wu,Lele Pei,Xing Zhang,Chao Li,Yu Zhang,Kangzhe Cao
Despite the multiple advantages of MnNb 2 O 6 -based anodes for Li + storage, the relatively low Li + -storage activity of their Nb species limits their Li + -storage performances. Herein, two significantly different-sized MnNb 2 O 6 /N-doped carbon (NC) composites with primary MnNb 2 O 6 nanoparticles uniformly confined in NC substrate are synthesized, denoted as P-MNO-NC (as tiny as approximately 5 nm for primary MnNb 2 O 6 nanoparticles) and H-MNO-NC (20–50 nm for primary MnNb 2 O 6 nanoparticles), respectively. Compared with H-MNO-NC, the significantly downsized primary MnNb 2 O 6 nanoparticles of P-MNO-NC enhance surface atom density and MnNb 2 O 6 /NC interface density, thus raising surface energy and residual stress to promote lattice relaxation. Consistent with this, systematic characterizations and theoretical calculations confirm that P-MNO-NC features widened intra-lattice Nb-layer Li + channels and reduced Nb-layer Li + -diffusion energy barrier to facilitate Li + migration through Nb layers, which makes the Nb 5+ ions of P-MNO-NC more accessible to the intercalated Li + ions and thereby substantially enhances the Li + -storage capability of its Nb species. Correspondingly, P-MNO-NC exhibits significantly higher Nb 3+ content after lithiation than H-MNO-NC. The intercalation-type Li + -storage mechanism is also verified for both composites. On this basis, P-MNO-NC significantly outperforms H-MNO-NC in Li + -storage performances as anode for both lithium-ion batteries (LIBs) and hybrid lithium-ion capacitors (HLICs). This work provides a fresh crystallographic insight into the size-reduction effect of P-MNO-NC on its significantly enhanced Li + -storage capability, which can be adopted to optimize the intrinsic Li + -storage performances of other Nb-based anodes.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xinyao Li,Xiufang Cui,Yajie Guan,Di Chen,Guo Jin
To combat synergistic high-temperature wear-oxidation failure in critical components (e.g., gas turbines), this study designs laser-clad FeCoCrNi-Nb gradient high-entropy alloy coatings (Nb-GHEA). The monolithic gradient architecture integrating a Laves-phase-dominated surface, nanoscale eutectic transition, and ductile FCC substrate. The coating achieves oxidation resistance at 800 °C (mass gain: 0.056 mg·cm −2 ), attributed to sluggish diffusion forming an adherent Cr 2 O 3 -NbO 2 scale and dynamic Nb 4+ /Nb 5+ redox-mediated crack healing. Furthermore, it exhibits an ultra-low wear rate (9.29 × 10 −7 mm 3 ·N −1 ·m −1 ), friction coefficient (0.2207), and impact toughness (115.8 J) at this temperature. These enhancements primarily originate from multi-layer structure synergy, which transitions the dominant wear mechanism from adhesion to mild abrasion. This work establishes Nb-GHEA as a solution for critical tribological components under extreme conditions
研究领域:
材料科学
·
摩擦学
·
高温材料
·
增材制造
·
腐蚀与氧化
·
金属合金
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）