TALANTA
·
2017
·
IF 4.162
Zhengkun Xie,Wang Lu,Lingxi Yang,Gaiping Li,Baoxian Ye
Baicalein and baicalin are the major flavonoids found in Scutellariae Radix, an essential herb which has had a presence in traditional Chinese medicine (TCMs) for more than two thousands of years. Owing to their similar characteristics and physiochemical properties, sensitive, it is a great challenge to detect both of them simultaneously. In this work, a novel, facile and sensitive electrochemical method was proposed based on tantalum oxide (Ta 2 O 5 ), niobium oxide (Nb 2 O 5 ) particles and antiseptic chitosan modified carbon paste electrode (Ta 2 O 5 -Nb 2 O 5 @CTS-CPE). Scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) were used to characterize the properties and investigate the electrochemical response of the sensor. The electrochemical behaviors and redox mechanisms of two analytes were investigated at the target electrode. Under the optimum conditions, the highly sensitive and simultaneous determination of baicalein and baicalin was successfully achieved with a linear response range of 0.08–8.0 μM for both of them. The obtained detection limits for baicalein and baicalin were of 0.05 and 0.03 μM (S/N=3), respectively. Furthermore, the proposed sensor displayed high sensitivity, excellent stability and satisfactory results in Scutellariae Radix samples analysis and hydrolysis process analysis of baicalin in vivo .
研究领域:
分析化学
·
电化学
·
传统中药
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Junkun Yan,Yinhao Dai,Guiqin Xiao,Yuhua Zhang,Jinlin Li,Jingping Hong
Three Nb 2 O 5 supported Pt-promoted cobalt catalysts were prepared by co-impregnation and sequential impregnation methods. The dispersion of cobalt species was controlled by glow discharge plasma technique, and cobalt particle size on all three catalysts are in the same level (4.2–4.6 nm). It was found that the metal precursor impregnation sequence significantly affected the interaction among Co, Pt and Nb 2 O 5 , and thus results in different H 2 adsorption capacity. Compared to the catalyst prepared by first impregnation of Pt precursor (Pt-Co/Nb 2 O 5 ), the catalysts prepared by simultaneous impregnation of Co and Pt precursors (CoPt/Nb 2 O 5 ) and first Co impregnation (Co-Pt/Nb 2 O 5 ) obtained a significantly decreased interaction among Co and Nb 2 O 5 . Moreover, high cobalt reducibility (>88 %) was realized at such high cobalt dispersions on these two catalysts, the corresponding weaker H 2 adsorption strength and more active sites resulted in their 1.8 times higher FTS activities than Pt-Co/Nb 2 O 5 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Haoyang Xu,Yifan Cheng,Xuen Guo,Yang Wang,Zhiqiang Zhang,Chaoqun Mu,Zhixian He,Yao Wang,Juanqin Xue,Liang Zhang
Photocatalytic reduction technology enables the transformation of highly toxic Cr(VI) into the less hazardous Cr(III), offering an environmentally friendly and sustainable approach to water treatment. This study innovatively proposes a synergistic strategy of "oxygen vacancy engineering–heterostructure construction–biomass loading" to fabricate a three-dimensional OV-Bi 12 GeO 20 /Nb 2 O 5 /CTS composite photocatalyst. The incorporation of oxygen vacancies (OVs) into Bi 12 GeO 20 via a straightforward hydrothermal approach reduces its bandgap from 3.16 eV to 1.50 eV, thereby improving visible light absorption and extending the lifespan of photo-generated charge carriers. Under identical reaction conditions, the photocatalytic reduction efficiency of Bi 12 GeO 20 is only 24.376 %, while that of OV-Bi 12 GeO 20 reaches 67.255 %. Further construction of I-type heterojunction with Nb 2 O 5 further enhances the carrier separation efficiency, and the photocatalytic efficiency of OV-Bi 12 GeO 20 /Nb 2 O 5 is increased to 94.525 %. OV-Bi 12 GeO 20 /Nb 2 O 5 is immobilized onto chitosan (CTS) via a glutaraldehyde cross-linking strategy. Owing to its abundant hydroxyl and amino functional groups, CTS demonstrates strong adsorption capacity for Cr(VI). After 5 cycles of use, its photocatalytic performance remained at approximately 98.35 % of the initial level. Experimental and mechanistic analyses reveal that OVs function as e − traps, promoting the separation of photo-generated charge carriers, while the I-type heterojunction facilitates the efficient reduction of Cr(VI) by enabling directed charge migration.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 31
·22909-22923
·
IF 4.4
Kang Chenchen,Wang Xinyi,Zhang Fan,Deng Jiahao,Xiang Ziqi,Pang Lingyan,Liu Hui
Lithium–sulfur (Li–S) batteries are regarded as one of the most promising next-generation energy storage technologies owing to their ultrahigh theoretical specific capacity and energy density. Nevertheless, their practical application is still hampered by severe polysulfide shuttling, poor electrode conductivity, and large volume variation during cycling. Herein, medical-grade cotton wool was employed as a sustainable carbon precursor to construct a porous carbon framework, followed by solvothermal and thermal treatment to obtain orthorhombic Nb 2 O 5 /PC (T-Nb 2 O 5 /PC). Furthermore, thiourea was introduced as a dopant source to achieve nitrogen and sulfur co-doping, generating nitrogen/sulfur co-doped T-Nb 2 O 5 -modified biomass-derived porous carbon (NS-T-Nb 2 O 5 /PC) with synergistic catalytic activity and enlarged surface area. Comprehensive structural analyses reveal that N/S co-doping not only induces abundant lattice defects and active sites but also optimizes the electronic configuration and ion-transport channels while preserving the crystal integrity. Benefiting from these features, the NS-T-Nb 2 O 5 -1/PC/S electrode delivers a high initial discharge capacity of 1263.5 mAh g −1 at 0.1 C and maintains 685.5 mAh g −1 after 200 cycles, together with outstanding reversibility and rapid kinetics in the 0.1–1 C range. This work offers an effective strategy to regulate the electronic structure and interfacial chemistry of Nb 2 O 5 -PC host via in situ heteroatom doping, thereby enabling suppressed shuttle effect and enhanced Li–S battery performance.
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 32
·27094-27101
·
IF 3.289
Xiao Yu,Ling Xin,Yong Liu,Wenxia Zhao,Baojun Li,Xiang Zhou,Hui Shen
One of the main drawbacks with applying the most promising electrode materials in lithium-ion batteries is their intrinsic poor electronic conductivity. Many approaches which include mixing them with good electrical conductors have been developed to solve this problem, yet they do not improve the lattice electronic conductivity within the crystal. Here we present a one-step hydrothermal route for fabricating the core–shell heterostructures through sequential growth of the core and shell materials. The cores are Nb-doped TiO2 rods with improved conductivity that can deliver high capacity, yet the Nb2O5 nanosheets shells can act as a protective layer to prevent electrode dissolution and maintain the electrode integrity over long term cycles and contribute additional lithium storage capacity. When employed as an anode material in lithium-ion batteries, it exhibits an outstanding cycle stability of 189 mA h g−1 at 170 mA g−1 for more than 700 cycles. This work provides an important strategy to improve the conductivity of the host and construct a protective layer by simply adding a guest ion in reaction.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6
Ning Zhu,Haiyun Huang,Jia Liu,Wenjie Zhang,Xinghua Zhang,Longlong Ma,Lungang Chen
The production of sustainable aviation fuels (SAF) via hydrodeoxygenation (HDO) of biomass-derived aldol-condensation intermediates has attracted extensive attention. In this work, a composite Nb 2 O 5 -γ-Al 2 O 3 supported Ni catalyst was designed to modify Ni reducibility and catalyst acidity for efficient HDO. We found that the formation of Nb-O-Al interfacial bonds effectively suppressed the generation of Ni-O-Al, significantly weakening the strong metal-support interaction (SMSI) inherent to γ-Al 2 O 3 and greatly enhancing the reducibility of Ni. As a result, the Ni 0 fraction increased from 27.01% on Ni/γ-Al 2 O 3 to 47.09% on 15Ni/N2A1. Meanwhile, the strong Lewis acidity associated with Nb 5+ provided crucial sites for C-O bond cleavage, while the intrinsic acidity and mesoporous structure of γ-Al 2 O 3 were preserved and further optimized within the composite support. TEM and CO-pulse measurements confirmed improved metal dispersion and reduced Ni particle size, collectively strengthening both hydrogenation and deoxygenation functions. The composite 15Ni/N2A1 catalyst achieved a high alkane yield of 79.6 wt% with initial reaction rate of 35.90 mmol·L −1 ·h −1 , in the HDO of the furfural-cyclopentanone aldol-condensation product, together with excellent substrate adaptability and cycling stability. Overall, the composite Nb 2 O 5 -γ-Al 2 O 3 enables synergistic regulation of Ni reducibility, medium and strong acidity, providing an effective design strategy for high-performance non-noble metal catalysts in SAF production by HDO.
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zhaozhuo Yu,Wenzhuo Kong,Yaping Guo,Wen Liang,Jiawei Liang,Meijuan Chen,Dongxu Zhao,Hongzhen Ma,Xiangjun Liu,Solomon Inalegwu Okopi,Lei Che,Qi Zhang,Zhuohua Sun,Fuqing Xu
Eco-friendly lignin depolymerization into monomeric phenols in an aqueous system is essential for the sustainable and green valorization of lignocellulosic biomass. However, a major challenge in this process is the development of efficient and stable catalysts for aqueous reductive catalytic fractionation (RCF), as water can cause catalyst deactivation and reduce monomer yields. In this study, a water-resistant RuNiZnO x /Nb 2 O 5 catalyst is developed that demonstrates excellent catalytic activity and stability in aqueous systems, achieving a near-theoretical monomeric phenol yield of 40.1 wt% under reaction conditions of 240℃ and 3 MPa H 2 for 4 h. The excellent performance of this catalyst is attributed to the synergistic hydrogen spillover effect between Ni and Ru and the strong acidic properties of ZnO, as revealed by in-situ XPS analysis and NH 3 -TPD, respectively. This hydrogen spillover effect significantly alters the product composition, promoting the generation of POH-S/G from lignin model compounds. Additionally, screening of the catalyst support materials revealed that Nb 2 O 5 not only enhances Ru dispersion but also improves its stability, resulting in a minor decrease in lignin monomer yield observed after three cycles.
研究领域:
生物质化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Kaiyi Su,Chaofeng Zhang,Yehong Wang,Jian Zhang,Qiang Guo,Zhuyan Gao,Feng Wang
ABSTRACT Although different NbO x units are present in Nb 2 O 5 -based catalysts, the correlations between these structures and activity remain unclear, which considerably hinders the further development of Nb 2 O 5 photocatalysis . Herein, we utilized N- hydroxyphthalimide (NHPI) as the probe molecule to distinguish the role of different NbO x units in the activation of C–H bond under visible light irradiation. With the addition of NHPI, Nb 2 O 5 catalysts with highly disordered NbO 6 units exhibited higher activities than that with slightly disordered NbO 6 units (419–495 vs . 82 μmol·g −1 ·h −1 ) in photocatalytic selective oxidation of ethylbenzene . Revealed by Raman spectra, electron paramagnetic resonance spectra, and transmission-electron-microscopy images, highly disordered NbO 6 units were confirmed to act as the active sites for the transfer of photogenerated electrons from NHPI, promoting the generation of phthalimide- N -oxyl (PINO) radicals for the enhanced conversion of ethylbenzene under visible light irradiation. This study provides guidance on the role of local NbO x units in Nb 2 O 5 photocatalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Tianye Guo,Qineng Xia,Yi Shao,Xiaohui Liu,Yanqin Wang
A new route is reported for the direct deoxygenation of lignin model compounds to aromatic hydrocarbons via the catalytic hydrogen transfer reactions over Ru/Nb 2 O 5 -SiO 2 catalyst with 2-PrOH as a hydrogen donor. It is found that Ru/Nb 2 O 5 -SiO 2 catalyst is active for the hydrodeoxygenation of p -cresol with 98.5% conversion and 84.0% yield of toluene at 230 °C, owing to the significant promotion effect of NbO x species on C O bond cleavage and the proper transfer hydrogenation activity of Ru. Furthermore, Ru/Nb 2 O 5 -SiO 2 catalyst also shows excellent performances in the transfer hydrodeoxygenation of various lignin model compounds such as 2-methoxy-4-methyl phenol, benzyl phenyl ether (α-O-4 model compound), 2-(2-methoxyphenyl)oxy-1-phenethanol (β-O-4 model compound) and even the real lignin extracted from birch, into aromatic hydrocarbons with 2-PrOH as the hydrogen donor. The reaction pathway studies of these model compounds demonstrate that the direct deoxygenation (DDO) is the main reaction route over Ru/Nb 2 O 5 -SiO 2 catalyst in the presence of 2-PrOH. Here, using 2-PrOH as a hydrogen source is found to be more selective to aromatic hydrocarbons than using molecular hydrogen. This work provides a new way for the high selective production of aromatic hydrocarbons from renewable lignin via the catalytic hydrogen transfer reactions.
研究领域:
化学工程
·
催化
·
可再生能源
·
有机化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 10
·e202300067
·
IF 8.4
Wenhao Liu,Xuanpeng Wang,Jinshuai Liu,Changyuan Guo,Fan Qiao,Xiaoling Ding,Xiaobin Liao,Chunhua Han
To better satisfy the increasing demands for electric vehicles, it is crucial to develop fast-charging lithium-ion batteries (LIBs). However, the fast-charging capability of commercial graphite anodes is limited by the sluggish Li + insertion kinetics. Herein, we report a synergistic engineering of uniform nano-sized T-Nb 2 O 5 particles on graphite (Gr@Nb 2 O 5 ) with C−O−Nb heterointerfaces, which prevents the growth and aggregation of T-Nb 2 O 5 nanoparticles. Through detailed theoretical calculations and pair distribution function analysis, the stable existence of the heterointerfaces is proved, which can accelerate the electron/ion transport. These heterointerfaces endow Gr@Nb 2 O 5 anodes with high ionic conductivity and excellent structural stability. Consequently, Gr@10-Nb 2 O 5 anode, where the mass ratio of T-Nb 2 O 5 /graphite=10/100, exhibits excellent cyclic stability and incredible rate capabilities, with 100.5 mAh g −1 after 10000 stable cycles at an ultrahigh rate of 20 C. In addition, the synergistic Li + storage mechanism is revealed by systematic electrochemical characterizations and in situ X-ray diffraction. This work offers new insights to the reasonable design of fast-charging graphite-based anodes for the next generation of LIBs. Graphical Bond together : Benefiting from the C−O−Nb heterointerfaces that can effectively enhance the structure stability and facilitate electron/ion transport, composite of T-Nb 2 O 5 particles decorated on graphite exhibits low interfacial resistance, high Li + diffusion coefficient (nearly 34 times higher than graphite), and a high discharge capacity of 100.5 mAh g −1 after 10000 cycles at 20 C.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Qian Li,Jiuer Yu,Xiaoxue Zhu,Haojun Liu,Fang Yuan,Yuanmeng Fan,Xuezhong He,Dengji Xiao,Jian Yang
A topological confinement strategy is developed to construct atomically matched F-Nb 2 CT x /Nb 2 O 5 heterointerfaces. • The strongly coupled heterointerface enables 0.16068 |e| charge transfer and generates a built-in electric field. • The built-in electric field synergistically accelerates electron migration and Li + diffusion kinetics. • Excellent rate capability (257.7 mAh g −1 at 5.0 A g −1 ) and cycling stability (125.2% after 550 cycles) are achieved. • This work establishes a new heterointerface engineering paradigm for high-power, long-life lithium-ion battery anodes. Niobium pentoxide (Nb 2 O 5 ) is regarded as a promising anode material for lithium-ion batteries owing to its open-framework structure, competitive theoretical capacity, and intrinsic operational safety. However, its practical application is impeded by intrinsically low electronic conductivity and sluggish lithium-ion diffusion, leading to unsatisfactory rate capability and cycling stability. Herein, we propose a novel topological confinement strategy to construct atomically matched few-layer Nb 2 CT x /Nb 2 O 5 (F‑Nb 2 CT x /Nb 2 O 5 ) heterointerfaces for enhanced electron/ion kinetics. By leveraging the unique two-dimensional geometry of F‑Nb 2 CT x , a natural topological confinement space is established, inducing the in-situ derivation of well-ordered ultrafine Nb 2 O 5 nanocones with atomic-level lattice matching through the shared niobium element. This strongly coupled heterointerface enables electron transfer of 0.16068 |e| from F‑Nb 2 CT x to Nb 2 O 5 and establishes a built-in electric field, synergistically optimizing electron/ion transport kinetics. Benefiting from the strong interfacial coupling, the resulting electrode delivers a high reversible capacity of 430.0mAh g −1 at 0.2 A g −1 and maintains a remarkable rate capability of 257.7mAh g −1 even at 5.0 A g −1 . Moreover, it exhibits exceptional cycling stability with a capacity retention of 125.2% after 550 cycles at 1.0 A g −1 . This work establishes a new paradigm for overcoming the kinetic bottlenecks of oxide anodes through rational heterointerface engineering. A topological confinement strategy is developed to construct atomically matched few-layer Nb 2 CT x /Nb 2 O 5 (F-Nb 2 CT x /Nb 2 O 5 ) heterointerfaces. The unique two-dimensional geometry of F‑Nb 2 CT x provides a natural topological confinement space, directing the in-situ derivation of well-defined ultrafine Nb 2 O 5 nanocones with atomic-level lattice matching through the shared niobium element. This strongly coupled heterointerface enables electron transfer of 0.16068 |e| from F‑Nb 2 CT x to Nb 2 O 5 and establishes a built-in electric field, synergistically optimizing electron/ion transport kinetics. The resulting F‑Nb 2 CT x /Nb 2 O 5 heterostructured anode achieves an exceptional high-rate capacity of 257.7 mAh g −1 at 5.0 A g −1 and remarkable cycling stability, retaining 125.2% of its capacity after 550 cycles at 1.0 A g −1 . This work provides a new paradigm of heterointerface engineering to overcome the kinetic bottlenecks of oxide anodes for high-power, long-life lithium-ion batteries. Download: Download high-res image (207KB) Download: Download full-size image
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产品关联
DOI
高影响因子
Energy Technology
·
2025
·
IF 3.6
Xiaobing Shi,Hao Xiao,Jun Huang,Cheng Chi
To address the safety limitations of liquid electrolytes and performance bottlenecks in conventional energy storage devices, a high-concentration polymer-in-salt polymer solid electrolyte (PiS-PSE) and a 3D conductive network-engineered niobium pentoxide (Nb 2 O 5 ) composite anode for solid-state hybrid lithium-ion capacitors (HLICs) are developed. The optimized lithium bis(trifluoromethanesulfonyl)imide/poly(vinylidene fluoride -co -hexafluoropropylene) (LiTFSI/PVDF-HFP) electrolyte (mass ratio 3:1) achieves an ionic conductivity of 2.09 × 10 − 3 S cm −1 at 20 °C with enhanced electrochemical stability (>4.5 V vs. Li/Li + ). Simultaneously, the Nb 2 O 5 /graphene-carbon nanotube hybrid anode (NGNT-90%) exhibits exceptional pseudocapacitive behavior and rate capability (171 mAh g −1 at 0.1C). The integrated solid-state HLIC delivers a high energy density of 108.3 Wh kg −1 at 100 W kg −1 and maintains 37.63 Wh kg −1 at 500 W kg −1 , which is comparable with reported liquid-based LICs. Critically, the device demonstrates >80% capacitance retention after 300 cycles at 5C with near-unity coulombic efficiency (≈99.0%), attributable to stable electrode/electrolyte interfaces and dendrite-suppressing characteristics of the PiS-PSE. This work provides a material design paradigm for next-generation safe, high-performance electrochemical energy storage systems.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
固态电池技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）