JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiaoli Peng,Long Yuan,Shilan Li,Shengdong Jing,Yaozhu Tian,Zhu Luo,Yufei Zhang,Haosen Fan
Lithium‑sulfur batteries (LSBs) have attracted much attention due to their high theoretical energy density (2600 Wh kg −1 ) and low cost of sulfur cathodes. However, their practical application is hindered by the significant polysulfide shuttle effect and sluggish redox kinetics. To address these challenges, a Co-NC/Nb 2 O 5 heterostructure was successfully prepared through high-temperature annealing of a ZIF-67 precursor followed by hydrothermal growth of Nb 2 O 5 nanocrystals on the surface of Co -embedded and N-doped carbon polyhedrons (Co-NC). The unique structure features a hierarchical conductive framework with uniformly dispersed Nb 2 O 5 nanoparticles and defect-rich carbon matrix, which synergistically enhances sulfur utilization and ion diffusion. Numerous dangling bonds and defective sites exist on the Nb 2 O 5 surfaces, and its Lewis acidic site (Nb 5+ ) can inhibit the solvation and shuttling of LiPSs through strong chemical interactions with the S atoms of polysulfides via Nb-O-S bonds. The catalytic and adsorption mechanisms were explained by density functional theory (DFT) calculations and experimental results. Consequently, LSBs cells equipped with Co-NC/Nb 2 O 5 modified separators demonstrated exceptional electrochemical performance with a rate capability that provides a reversible capacity of 761.8 mAh g −1 at 3 °C. The composite of MOF-derived hollow carbon polyhedra decorated with Nb 2 O 5 nanoparticles ensured fast electron transfer, achieving a reversible capacity of 731.4 mAh g −1 after 500 cycles at 1C and 501.6 mAh g −1 after 1000 long cycles at 2C, with a capacity decay rate of only 0.03 % per cycle. Excellent electrochemical performance was maintained with a high sulfur loading cycling performance of 5 mg cm −2 at a low electrolyte/sulfur condition of 7 μL mg −1 . This work provides new insights into the development of high energy density LSBs and the advancement of next generation energy storage systems through precise electronic structure design at the heterojunction interface.
研究领域:
储能材料
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电化学
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纳米材料
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表面化学
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 68
·39561-39571
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IF 3.049
Fahim A. Qaraah,Samah A. Mahyoub,Mahmoud Elsayed Hafez,Guangli Xiu
Herein, we fabricated a C and N co-modified Nb2O5 nanonet structure (C–N/Nb2O5NNs) from niobium oxalate using 2-methylimidazole (Hmim) as a source for C and N via a simple hydrothermal route. The obtained nanonets are robust and cost-effective with excellent recycling stability. Compared with N-doped TiO2 (N-TiO2) and a Nb2O5 control sample (Nb2O5-CS), the resulting nanonets exhibited the highest performance toward the photocatalytic degradation of Rhodamine B (RhB) upon visible light irradiation (λ > 420 nm). Through this study, we revealed that the synergetic effects of C and N on the nanonet surface, which were effectively incorporated into the surface of the Nb2O5 nanonet structure, not only remarkably enhanced the visible light response by decreasing the bandgap to 2.9 eV but also improved the light utilization efficiency and photo-induced electron–hole pair separation efficiency of our nanonet structure. We also proposed that the presence of carbonate species (COx) and nitrogen species (NOx) increased the population of generated holes (h+) that had the key role in the photodegradation mechanism of RhB, suggesting reasonable importance for the modification of Nb2O5 with C and N. This synergism offers a new view to reveal the origin of photodegradation processes, introducing h+ as a key intermediate. Our approach provides a new insight to design 2D nanostructures with potential applications in catalysis, solar energy conversion, and environmental protection.
研究领域:
材料科学
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光催化
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 38
·21867-21876
·
IF 12.732
Zhaoxia Cao,Jian Guo,Shengnan Chen,Zhennan Zhang,Zhenpu Shi,Yanhong Yin,Mingguo Yang,Xiaoxu Wang,Shuting Yang
Lithium–sulfur (Li–S) batteries are one of the most promising next-generation energy storage systems. Nevertheless, the notorious lithium polysulfide (LiPS) shuttle and sluggish sulfur redox kinetics result in inferior electrochemical performances, which are the major obstacles to their commercial application. Engineering the surface/interface of the ultrafine polysulfide promotor which can accelerate LiPS conversion and improve sulfur utilization is still challenging. Herein, we propose an effective strategy to synthesize ultrafine heterostructural Nb2O5–NbC homogeneously distributed in a carbon nanofiber matrix. Polystyrene (PS), as the nanocrystallite growth modulator, plays a vital role in suppressing particle agglomeration. The in situ formed heterostructures with a rational interface engineering design can achieve effective LiPS regulation and speed up the redox kinetics, as confirmed by the density functional theory (DFT) calculations and experimental characterizations. As expected, the battery containing ultrafine Nb2O5–NbC heterostructures delivers long-term cyclability with a low capacity decay of 0.044% per cycle over 800 cycles at 1.0C. And the decay rate is as low as 0.045% after 250 cycles at 0.5C with a sulfur loading of 4.0 mg cm−2. This work provides a rational way to prepare ultrafine heterostructural polysulfide promotors via engineering the interface design for Li–S batteries.
研究领域:
能量存储系统
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材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Guoxiang Wang,Taipu Chen,Dahui Fang,Jinkai Hao,Zhigang Shao
The development of highly active and stable catalysts of oxygen evolution reaction (OER) plays a crucial role in proton-exchange-membrane water electrolysis (PEMWE). Herein, an electronic modulate was used to fabricate oxygen defect-rich and supported metal catalysts AuIr/Nb 2 O 5-x , and it promoted the sluggish kinetics and low efficiencies of OER with the interaction between oxygen defects and the active sites. The Nb–O defect with an electron redistribution and manipulated active electronic state tailored the OER performance. The Ir actively exposed the AuIr/Nb 2 O 5-x -500 catalyst, which exhibited a low overpotential of 230 mV and maintained an excellent stability for 200 h at the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 electrolyte. Furthermore, the PEMWE using AuIr/Nb 2 O 5-x -500 as the anode revealed a high water-splitting performance (1.61 V @ 0.5 A cm −2 & 1.70 V @ 1 A cm −2 ). In-situ Raman spectra and theoretical calculations revealed the electronic structure of AuIr/Nb 2 O 5-x -500 and the mechanism of OER processes, which rationalized the improved performance through the synergistic effect of metal–support interaction and defect effect.
研究领域:
电化学
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催化
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材料科学
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能量转换
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 6
·427
·
IF 3.504
Meiyin Wang,Hui Wang,Yuanhang Ren,Cheng Wang,Zhewei Weng,Bin Yue,Heyong He
A series of composites consisting of g-C3N4sheet and mesoporous Nb2O5(mNb2O5) microsphere were fabricated by in situ hydrolysis deposition of NbCl5onto g-C3N4sheet followed by solvothermal treatment. The samples were characterized using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), N2adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The photocatalytic activity of the composites was studied by degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) in aqueous solution under visible light irradiation (λ> 420 nm). Compared with g-C3N4and mNb2O5, g-C3N4-mNb2O5composites have higher photocatalytic activity due to synergistic effect between g-C3N4and mNb2O5. Among these composites, 4% g-C3N4-mNb2O5has the highest efficiency and good recyclability for degradation of both RhB and TC-HCl.Keywords:photocatalytic degradation;g-C3N4;mesoporous Nb2O5;organic pollutant
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wenchao Zhang,Liangjun Wang,Shiyu Liu,Feng Guan,Min Jiang,Yanpeng Li,Dong Yue,Jialong Li,Xiaoxu Liu,Yu Feng
It is important that the dielectric material in the electrical system be able to handle the increasing applied electric strength owing to the rising demands for power supply reliability. Based on this, in this work, Nb 2 O 5 donor doped SiO 2 (NSO) particles were synthesized by high-temperature sintering method and successfully doped into the PI matrix. The maximum E b of the composite material is 527.3 kV/mm, which is 64.2% higher than that of pure PI (321.1 kV/mm) and 34.8% higher than that of the SiO 2 /PI composite material (392.5 kV/mm) owning to the effect of donor doping on the carrier transport of the composite material. At the same time, it maintains excellent dielectric stability and lower dielectric loss even at 100 ℃. These consequences offer a new strategy for enhancing the integrated dielectric properties of polymer dielectrics in insulation fields.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zaiman Zhang,Hao Xu,Hao Li
Hydrodeoxygenation (HDO) in aqueous phase is green and efficient approaches to convert the biomass and its derivative to high value-added chemicals and renewable fuels. However, it remains a great challenge for synthesizing catalysts with the excellent hydrodeoxygenation performance. Three kinds of Ni/Nb 2 O 5 catalyst with different crystal structures (Ni/TT-Nb 2 O 5 , Ni/T-Nb 2 O 5 , Ni/H-Nb 2 O 5 ) were prepared for vanillin hydrodeoxygenation. Compared with the Ni/TT-Nb 2 O 5 and Ni/H-Nb 2 O 5 catalyst, the Ni/T-Nb 2 O 5 catalyst had the most concentration of oxygen vacancies (O v ), which resulted in the excellent hydrodeoxygenation performance. At 180 ℃, 1 MPa H 2 , and the water/ethanol ratio of 8/12, 96.1% conversion of vanillin and 79.2% selectivity of 2-methoxy-4-methylphenol (MMP) were obtained. The abundant O v of Ni/T-Nb 2 O 5 adsorbed and activated the C-OH bonds of vanillyl alcohol (VA), while water formed a stronger transition state with VA to further reduce the disassociation energy of C-OH bonds. The synergistic effect between O v and water promoted the hydrodeoxygenation of vanillin in aqueous phase, achieving the high yield of MMP. This work provides a new idea for the preparation of catalysts with high catalytic performance in aqueous phase.
研究领域:
催化化学
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生物质转化
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Anyang Yu,Zhuang-Chun Jian,Qi Fan,Xiaodie Zhao,Minghui Dong,Mengchen Li,Junwei Luo,Yining Zhang,Mingxing Yuan,Zihan Su,Bingui Li,Yu Qin,Yichun Shen,Tianshuo Zhao,Qingyu Xu,Yueming Sun
Although the T-Nb 2 O 5 provides spacious pathways for Li-ion diffusion, it is prone to structural instability, arising from anisotropic stress accumulation and interlayer glide. Herein, we demonstrate that anchoring planar BO 3 3− polyanion groups into the T-Nb 2 O 5 interlayer serves as an effective structural stabilizer. This strategy alleviates anisotropic stress during (de)lithiation, thereby inhibiting interlayer glide and significantly suppressing the rapid capacity decay typically observed in early cycles. Nb 1.94 (BO 3 ) 0.1 O 4.7 (T-NBO-BO 3 ) delivers the high-rate capacity (309.4 mAh g −1 at 0.05 A g −1 , 117.8 mAh g −1 at 5 A g −1 ) and cycling stability (negligible capacity loss during the initial 160 cycles and low capacity loss of 0.007% every cycle at 1 A g −1 ) at 25°C. Notably, it also exhibits outstanding electrochemical performance at −20°C (94.4 mAh g −1 at 2 A g −1 , low capacity loss of 0.018% per cycle at 1 A g −1 ).
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zhenpeng Huang,Jiajia Ding,Xinwei Yang,Hao Liu,Peiyao Song,Yanglong Guo,Yun Guo,Li Wang,Wangcheng Zhan
Pt-based catalysts have attracted widespread attention in environmental protection applications, especially in the catalytic destruction of light alkane pollutants. However, developing a satisfying platinum catalyst with high activity, excellent water-resistance, and practical suitability for hydrocarbon combustion at low temperature is challenging. In this study, the Pt catalyst supported on the selected Nb2O5 oxide exhibited an efficient catalytic activity in propane oxidation and exceeded that of most catalysts reported in the literature. More importantly, the Pt/Nb2O5 catalyst maintained excellent activity and durability even after high-temperature aging at 700 °C and under harsh working conditions, such as a certain degree of moisture, high space velocity, and composite pollutants. The excellent performance of the Pt/Nb2O5 catalyst was attributed to the abundant metallic Pt species stabilized on the surface of Nb2O5, which prompted the C–H bond dissociation ability as the rate-determining step. Furthermore, propane was initially activated via oxidehydrogenation and followed the acrylate species path as a more efficient propane oxidation path on the Pt/Nb2O5 surface. Overall, Pt/Nb2O5 can be considered a promising catalyst for the catalytic oxidation of alkanes from industrial sources and could provide inspiration for designing superb catalysts for the oxidation of light alkanes.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Cell Reports Physical Science
·
2025
·
IF 7.3
Zhongzhe Wei,Xu Liu,Mingxuan Wang,Yao Lv,Songtao Huang,Jing Wang,Ming Jiang,Zhixiang Yang,Zihao Yao,Sheng Dai,Xiaonian Li,Jianguo Wang
The semi-hydrogenation of alkynes represents a paramount chemical transformation in the synthesis of fine chemicals and pharmaceuticals. However, the structural evolution of active sites during the reaction remains elusive. Here, we constructed a self-adaptive Pd/Nb 2 O 5 catalyst for efficient semi-hydrogenation of alkynes. Mechanistic studies disclose that Pd/Nb 2 O 5 intelligently modulates its structure in response to the specific alkyne type, efficiently preventing Pd poisoning by weakening the strong adsorption of alkynes. During the hydrogenation of aliphatic alkynes, the Pd/Nb 2 O 5 interface undergoes dynamic changes, generating oxygen vacancies (O v ) in situ through hydrogen spillover. In contrast, for the case of reactants of aromatic alkynes, the interface sites remain relatively stable. Coverage-dependent kinetics reveal that the dynamic O v formation of Pd/Nb 2 O 5 is determined by the distinct adsorption mechanism of aromatic and aliphatic alkynes. Due to the evolving interface, Pd/Nb 2 O 5 exhibits a high turnover frequency value of 55,338 h −1 , breaking the linear scaling relationships.
研究领域:
催化
·
化学反应工程
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材料科学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2022
·
IF 4.939
Panyi Wang,Yingying Cui,Senlong Zhao,Renguang Ye,Muzhi Cai,Laurent Calvez,Jean Rocherulle,Feifei Huang,Hongli Ma,Gongxun Bai,Junjie Zhang,Shiqing Xu,Xianghua Zhang
Germano-tellurite niobate glasses have gained significant interest because of their applications in lasers and optical devices. However, germano-tellurite niobate glasses tend to turn brown or dark, which is a major disadvantage for visible optical systems. This work is devoted to exploring the mechanism of this color-changing. Glasses with a molar composition of 70TeO 2 -10GeO 2 -10K 2 O-10Nb 2 O 5 (TGKN) were synthesized by conventional melt-quenching at various melting temperatures. Different melting temperature leads the glasses to present different colors. The precise glass composition was revealed by ICP-OES, and the thermal properties, optical properties, and microstructure of the TGKN glasses were investigated. The XRD patterns and DSC curves suggest that the formation of Te metal is not the principal reason for the color-changing. A novel interpretation that the generation of T-Nb 2 O 5 causes the color-changing was proposed based on the transmittance, XPS and Raman spectra. This work will provide a new perspective on clarifying the effects of melting temperature on color-changing in the germano-tellurite niobate glass.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Yanlin Xu,Zhuoyi Liu,Bin Liu,Bin Dong,Yuan Pan,Yanpeng Li,Yichuan Li,Hailing Guo,Yongming Chai,Chenguang Liu
Transformation of lignin-derived feedstocks into valuable hydrocarbons is of significant importance but still challenging. This work investigates the hydrodeoxygenation (HDO) of lignin compound guaiacol on Pt-based catalysts with improved surface hydrophobicity and metal dispersion for the first time. The efficiency of guaiacol hydrodeoxygenation into hydrocarbons over Nb 2 O 5 -modified Pt-based catalyst reaches 51 %, nearly doubling that over unmodified Pt/γ-Al 2 O 3 catalyst (25 %). On the one hand, Nb 2 O 5 causes the decrease of hydroxyl groups on catalyst, leading to the enhanced hydrophobicity of catalysts, which increases the reaction rate of guaiacol into hydrocarbons on unit of Pt metal sites. On the other hand, Nb 2 O 5 strengthens the metal-support interaction, which minimizes the size of Pt nanoparticles, providing more exposed metal sites, thus leading to a higher hydrocarbons yield on catalyst. However, excess introduction of Nb 2 O 5 leads to partial coverage of Pt metal sites, resulting in decreased yield of hydrocarbons. Furthermore, the routes of guaiacol HDO reaction over modified Pt-based catalysts are investigated. This work further illustrates the influence of catalyst surface properties on the HDO process of lignin compound, and thereby provides a promising approach for adjustment of catalyst surface properties in order to promote water-liberated reactions.
研究领域:
化学工程
·
催化科学
✓ 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）