ENERGY & FUELS
·
2024
·
IF 5.2
Siyuan Wang,Yunze Zhang,Jian Wang
Rationally designing highly active electrocatalysts for the oxygen reduction reaction (ORR) without relying on precious metals is critical for promoting the application of metal–air batteries and fuel cells. As a promising alternative to traditional Pt-group-based catalysts, transition-metal oxides (TMOs) with high corrosion resistivity and diverse structure configuration have exhibited great catalytic potential. However, the current favorable ORR performance of TMOs has often been achieved through their coupling with engineered carbons such as graphene and carbon nanotubes, which can obscure the intrinsic catalytic potential of TMOs. To promote TMO-based catalysts for ORR applications, comprehensively analyzing their catalytic properties and screening promising TMO-based parent materials is crucial. Herein to eliminate the research gap, 22 noble-metal-free TMOs (e.g., Co3O4, MnO, and Fe2O3) were benchmarked for ORR catalysis, with Pt/C and RuO2 as comparisons. Nb2O5 demonstrated the greatest potential as an ORR electrocatalyst among all of the studied TMOs, with higher specific activity surpassing that of Pt/C. In addition, it could achieve a larger peak power density than Pt/C in a more practical Zn–air battery setup, showing promise for applications. Regarding stability, most of the studied TMOs exhibited larger losses in limiting current densities than the degradation of half-wave potentials (from 0.65% to 7.54) after the 10,000 cycle accelerated degradation tests, pointing out the direction to improve their ORR stabilities.
研究领域:
电化学
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材料科学
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能源存储与转换
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Xinzhe Wang,Litao Han,Jiajia Zhang,Renqiang Liu,Fanjun Kong
Niobium pentoxide (Nb 2 O 5 ) possesses multiple redox couples, pseudocapacitive features and moderate operating voltage, which has been considered as a promising anode material. However, its poor conductivity can lead to sluggish reaction kinetics and severe capacity decay, and low theoretical capacity further restricts its commercial application. Herein, Nb 2 O 5 nanoparticles embedded in the porous carbon (Nb 2 O 5 /PC) are successfully fabricated using hydrothermal reaction and succedent heating treatment. Benefiting from high conductivity and malleability of PC, Nb 2 O 5 /PC composite delivers superior cycling performance and fast reaction kinetics. Notably, the PC matrix can improve pseudocapacitive contribution, accelerate the Li + diffusion behavior and reduce the charge transfer resistance of Nb 2 O 5 nanoparticles, presenting stable reaction interfaces. Furthermore, the superior electrochemical performance of Nb 2 O 5 /PC//LiFePO 4 full cell lays a good foundation for subsequent exploration of high-performance anode electrodes.
研究领域:
材料科学
·
电化学
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储能
·
纳米材料
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产品关联
DOI
高影响因子
RARE METALS
·
2026
·
IF 11
Rui Huo,Maoliang Tan,Hao Song,Liheng Wang,Tao Li,Feng Zhou,Zhi Chang,Paul K. Chu
en This link goes to a English section zh This link goes to a Chinese section Two-dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three-dimensional chemical bonding. Herein, we demonstrate the direct synthesis of nonlayered 2D NbN 0.8 /Nb 5 N 6 heterojunction nanosheets from commercial bulk Nb 2 O 5 through a scalable molten-salt-assisted route. The in situ formed molten KNbO 3 intermediate, confined within the K 2 CO 3 /KCl flux, guides the 2D growth of niobium nitride under NH 3 , yielding nanosheets with 4.8 nm thickness and lateral sizes of 3–5 μm. The as-synthesized 2D NbN 0.8 /Nb 5 N 6 nanosheets deliver a large capacitance of 918.2 F cm −3 (324.1 F g −1 ) at 1 A cm −3 , superior rate performance of 649.8 F cm −3 (229.4 F g −1 ) at 20 A cm −3 , and exceptional long-term cycling stability with 95.4% retention over 10,000 cycles, surpassing most reported niobium-based nitrides. Furthermore, the solid-state symmetric supercapacitor assembled with the two electrodes of 2D NbN 0.8 /Nb 5 N 6 nanosheets delivers a high volumetric energy density of 13 mWh cm −3 . This work reports a novel high-performance 2D niobium nitride electrode material and offers a generalizable synthesis strategy for 2D nonlayered transition metal nitrides. 摘要 en This link goes to a English section zh This link goes to a Chinese section 二维非层状氮化铌材料在电化学储能领域引起了广泛关注。然而,由于该类材料具有强三维化学键合的非层状晶体结构,其合成一直面临挑战。本研究展示了一种可规模化生产的熔盐辅助法,能够直接以商业块体Nb 2 O 5 为原料合成非层状二维NbN 0.8 /Nb 5 N 6 异质结纳米片。在NH 3 气氛下,原位生成并被限制在K 2 CO 3 /KCl熔盐介质中的KNbO 3 中间体,有效引导了材料的二维生长,最终获得了厚度为4.8 nm、横向尺寸为3–5 μm的纳米片。所合成的二维NbN 0.8 /Nb 5 N 6 纳米片在1 A cm −3 电流密度下具有918.2 F cm −3 (324.1 F g −1 )的高比电容,在20 A cm −3 下仍保持649.8 F cm −3 (229.4 F g −1 )的优异倍率性能,以及卓越的长循环稳定性(10,000次循环后容量保持率高达95.4%),其性能优于大多数已报道的铌基氮化物。此外,利用该二维NbN 0.8 /Nb 5 N 6 纳米片组装的固态对称超级电容器,可提供13 mWh cm −3 的高体积能量密度。本工作不仅报道了一种高性能的二维氮化铌电极材料,也为二维非层状过渡金属氮化物的合成提供了一种普适性策略。
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jujun Yuan,Xiaofan Li,Jun Liu,Shiyong Zuo,Xiaokang Li,Fangkun Li,Yunfei Gan,Haishan He,Xijun Xu,Xianke Zhang,Junxia Meng
The distinctive pomegranate-like Nb 2 O 5 /Carbon@ N -doped carbon (Nb 2 O 5 /C@NC) composites are fabricated using hydrothermal method integrated with nitrogen doped carbon coating procedure. For the SIBs anode, the Nb 2 O 5 /C@NC composites present superior rate character and sustainable capacity (117 mAh g −1 upon 1000 cycles at 5 A g −1 ). The in-situ X-ray diffraction (XRD) is utilized to research its sodium storage mechanism. Furthermore, for PIBs, the Nb 2 O 5 /C@NC composites present sustainable capacity (81 mAh g −1 upon 1000 cycles at 1 A g −1 ). The outstanding performance of Nb 2 O 5 /C@NC composites is ascribed to its unique architecture, in which Nb 2 O 5 nanocrystals embedded in porous carbon can restrain agglomeration of Nb 2 O 5 nanocrystals, enhance electron/ion diffusion kinetics , and ensure electrolyte accessibility, and moreover, NC shell layer can provide effective active sites and further increase ions/electrons transfer.
研究领域:
材料科学
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电化学
·
纳米能源材料
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储能技术
·
先进电池
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DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Fenyan Wei,Dengwei Hu,Jingjing Guo,Fangyi Yao,Taotao Liu
The crystalline hexagonal Nb 2 O 5 (H-Nb 2 O 5 ) nanobelt clusters dominantly exposed (− 110) facet are firstly synthesized by a hydrothermal topological reaction with a precursor of fiber-like K 2 Nb 2 O 6 ·H 2 O. The structure and morphology of samples obtained at different temperatures and times are investigated. There are two steps in the synthesis process. One is the acid-exchanging reaction transforming into amorphous phase protonated niobate (HNO), and the other is dehydration reaction transforming into H-Nb 2 O 5 , and simultaneous dissolution reaction which forms nanobelt cluster morphology from the fiber-like particle. The formation mechanism of H-Nb 2 O 5 nanobelt clusters has been proposed in detail. After photo-reduced reaction between the H-Nb 2 O 5 nanobelt clusters and AgNO 3 solution, the dominantly exposed (− 110) facet of H-Nb 2 O 5 nanobelt is homogeneously covered by Ag nanoparticles . The photo-electrochemical performance of the obtained H-Nb 2 O 5 nanobelt clusters and Ag deposited H-Nb 2 O 5 (Ag-Nb 2 O 5 ) nanobelt clusters as photocatalysts are evaluated by splitting water under simulated sunlight illumination, and the generated photocurrent of Ag-Nb 2 O 5 sample is 10.73 μA, which is 535 times that of the H-Nb 2 O 5 sample. The results demonstrate that the Ag-Nb 2 O 5 nanobelt clusters have a high photo-electrochemical performance as well as good sunlight photoelectric conversion efficiency.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
·
半导体材料
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电化学
·
太阳能转换
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaodie Zhao,Anyang Yu,Tian Jiang,Qi Fan,Pingping Sun,Qingyu Xu
Tailoring the crystalline structure and facet orientation of T-Nb2O5 anode electrodes is pivotal for optimizing the Li+ transport kinetics. Herein, a crystallization engineering strategy is employed to synthesize urchin-like T-Nb2O5 microspheres composed of single-crystalline whiskers growing along the (001) orientation. These whiskers are characterized by nearly 100% exposed vertical (001) facets that accelerate Li+ diffusion. Furthermore, the remaining N3– expands the interlayer spacing, which optimizes Li+ transport pathways. Benefiting from these synergetic effects, abundant ion entry and exit sites with smooth ion transport channels promote the rapid Li+ diffusion in the T-Nb2O5 microspheres, delivering a high capacity and improving the rate performance (324 mAh g–1 at 0.05 A g–1, 87.5 mAh g–1 at 5 A g–1). This work presents a strategy of crystallization engineering for the preparation of fast-charging electrode materials and provides deep insights on the correspondence among morphology, lattice structure, and electrochemical performance.
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changsheng Wu,Zhiyong Wang,Xianbo Jin
Niobium (Nb) is primarily used as the active material in Nb electrolytic capacitors in the form of metallic fine powder. Unlike traditional methods of preparing niobium powder through chemical or electrochemical reduction of metal compounds in molten salts, we report here the efficient preparation of Nb nanopowder via electrolysis of NbS 2 in the NaCl-KCl melt at 973 K. The NbS 2 is simply synthesized by carbo-sulfidation of Nb 2 O 5 . The following electro-desulfidation in the molten electrolyte converts solid NbS 2 into Nb nanopowder at the cathode, with S 2- ions moving to the anode and being oxidized to gaseous sulfur. The reduction path was verified to be NbS 2 → L x NbS 2 → NbS 2-w → Nb. Through constant cell electrolysis at 2.9 V, NbS 2 is rapidly reduced to nodular Nb nanopowder (50-100 nm), with a Current efficiency and energy consumption of approximately 94% and 3.58 kW·h kg⁻¹ Nb, respectively.
研究领域:
材料科学
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电化学
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纳米技术
·
冶金学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Jianwei Yuan,Kwame Nana Opoku,Pin Zhou,Jiaqing Cao,Yaorao Gao,Haoyang Peng,Baoliang Liu,Xiaohui Chen,Zhenwei Zhang,Fu Yang
The highly efficient green catalytic synthesis of jet fuel from low-chain biomass molecules is very attractive to afford sustainable development. Herein, ultrafine Ni nanoparticles assembled on Nb 2 O 5 nanofibers were constructed and effectively utilized in the reductive coupling of n-octanoic acid, offering a novel approach distinct from traditional hydrogenation methods for fatty acids. During the process, a synergistic effect was observed between the metallic Ni phase and the fibrous Nb 2 O 5 , facilitating immediate ketonization following reduction. This enabled the conversion of n-octanoic acid into pentadecane, a crucial component of aviation kerosene. The key factor driving this conversion was the attainment of a production rate of 8-pentadecanone higher than that of n-octane, particularly under optimal conditions, resulting in a significant yield of pentadecane. The catalytic assessment results show that adjusting Ni loading altered the performance of the catalyst in which 1.0 % Ni/Nb 2 O 5 afforded the best catalytic activity. By precisely controlling the reaction temperature at 300 °C and maintaining a hydrogen pressure of 1 MPa, an impressive pentadecane yield of 70.5 % was achieved. This innovative approach, which combines reduction with ketonization, offers a promising strategy for producing long-carbon chain alkanes from short-carbon chain fatty acids within a single reactor. This not only reduces economic costs but also streamlines overall processes, presenting a significant advancement in sustainable fuel production.
研究领域:
催化化学
·
绿色能源
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DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Fei Zhao,Yixin Guo,Xiang Wang,Jiahua Tao,Jinchun Jiang,Zhigao Hu,Junhao Chu
Inorganic CsPbBr 3 perovskite solar cell (PSC) has attracted much attention owing to its outstanding air and thermal stability and low cost manufacture process. Crystalline TiO 2 (c-TiO 2 ) has been widely used as electron-transporting layer (ETL) material for inorganic CsPbBr 3 PSC. However, c-TiO 2 requires high-temperature (>450 °C) fabrication process which impedes the application of flexible inorganic CsPbBr 3 PSC and its low electron mobility further limits the performance enhancement. Herein, we prepared novel amorphous Nb 2 O 5 (a-Nb 2 O 5 ) ETL through a facile room-temperature sputtering method for inorganic planar CsPbBr 3 PSC. The PSC with a-Nb 2 O 5 ETL has gained a champion efficiency of 5.74%, which is higher than that of the PSC (5.12% or 4.67%) based on crystalline Nb 2 O 5 (c-Nb 2 O 5 ) ETL or c-TiO 2 ETL by high-temperature (500 °C) annealing. The improved photovoltaic characteristic for CsPbBr 3 PSC with a-Nb 2 O 5 ETL may be ascribed to its suitable work function, high optical transmittance, low charge recombination at the a-Nb 2 O 5 /CsPbBr 3 interface and the superior crystallinity of CsPbBr 3 film deposited on a-Nb 2 O 5 ETL. Moreover, the a-Nb 2 O 5 -based CsPbBr 3 PSC without encapsulation exhibits a good long-term stability in ambient atmosphere. This work offers a new research direction for preparing high-performance inorganic PSC.
研究领域:
光伏技术
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材料科学
·
钙钛矿太阳能电池
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薄膜技术
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Yuda Lin,Yiheng Chen,Ye Fan,Shenghui Zheng,Liting Qiu
With the aim of improving the intrinsic conductivity of Nb2O5, we synthesized fluorine-doped Nb2O5 with rich oxygen vacancies anchored on the N/F carbon skeleton (F–Nb2O5@NFC) by a one-step annealing method. In this structure, F-doping greatly improves the intrinsic conductivity of Nb2O5, and the theoretical calculation results show that F–Nb2O5 has surprisingly zero band gap metal characteristics. At the same time, due to F-doping, a large number of oxygen vacancies are introduced into the structure, which increases the concentration of free electrons and further enhances the conductivity of the composites. In addition, the N/F codoped carbon skeleton ensures the rapid transmission of electrons. Under the blessing of multilevel conduction, F–Nb2O5@NFC exhibits excellent electrochemical performance, with a reversible specific capacity of 130 mAh g–1 after 1400 cycles at a current density of 3 A g–1, and the rate capacity reaches 110 mAh g–1 at a high current density of 10 A g–1.
研究领域:
材料科学
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储能
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电化学
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纳米材料
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 54
·32309-32322
·
IF 3.119
Fahim A. Qaraah,Samah A. Mahyoub,Abdo Hezam,Wei Zhang,Guangli Xiu,Janvier Munyaneza,Chengzi Wu
Significant endeavors have been devoted in the past few years to establish efficient visible light-activated photocatalysts. Herein, we successfully synthesized a flower-like hierarchical nitrogen-doped and carbon-sensitized Nb2O5 (NBO) nanostructure (denoted N-NBO/C). The as-prepared N-NBO/C possessed a specific surface area of 260.37 m2 g−1 and single wire diameter of less than 10 nm. The effect of reaction parameters such as hydrothermal reaction time, temperature and concentration of hexamethylenetetramine (Hmta) on the morphology of NBO was systematically investigated to elucidate the growth mechanism. The carbon on the surface and the nitrogen in the framework of NBO are beneficial for light harvesting, visible light absorption, formation of oxygen vacancies, and electron–hole separation. The photocatalytic performance of the as-fabricated N-NBO/C nanostructures was estimated via the photodegradation of 30 mg L−1 RhB, where greater than 98% of RhB was decomposed within 30 min upon visible-light radiation. Hence, the obtained N-NBO/C nanostructure exhibits much higher photocatalytic activity for the decomposition of RhB upon visible light irradiation than that of pure niobium oxide (NBO), nitrogen-doped titanium oxide (N-TIO), and nitrogen-doped niobium oxide (N-NBO). This work supplies a versatile route for the synthesis of nitrogen-doped and carbon-sensitized metal-oxide nanostructures for possible utilization in solar energy transformation and environmental remediation.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2015
·Vol. 8
·期 10
·1761-1767
·
IF 7.657
Yi Shao,Qineng Xia,Xiaohui Liu,Guanzhong Lu,Yanqin Wang
Graphical Mild mannered: Under mild conditions (170 °C, 2.5 MPa), Pd/10 %Nb 2 O 5 /SiO 2 is effective for the hydrodeoxygenation reactions of 4-(2-furyl)-3-buten-2-one (the aldol adduct of furfural with acetone), palmitic acid, tristearin, and diphenyl ether (model compounds of vegetable oils, microalgae oils, and lignin) and gives high yields (>94 %) of alkanes with little C C bond cleavage. A simple Pd-loaded Nb 2 O 5 /SiO 2 catalyst was prepared for the hydrodeoxygenation of biomass-related compounds to alkanes under mild conditions. Niobium oxide dispersed in silica (Nb 2 O 5 /SiO 2 ) as the support was prepared by the sol–gel method and characterized by various techniques, including N 2 adsorption, XRD, NH 3 temperature-programmed desorption (TPD), TEM, and energy-dispersive X-ray spectroscopy (EDAX) atomic mapping. The characterization results showed that the niobium oxide species were amorphous and well dispersed in silica. Compared to commercial Nb 2 O 5 , Nb 2 O 5 /SiO 2 has significantly more active niobium oxide species exposed on the surface. Under mild conditions (170 °C, 2.5 MPa), Pd/10 %Nb 2 O 5 /SiO 2 was effective for the hydrodeoxygenation reactions of 4-(2-furyl)-3-buten-2-one (aldol adduct of furfural with acetone), palmitic acid, tristearin, and diphenyl ether (model compounds of microalgae oils, vegetable oils, and lignin), which gave high yields (>94 %) of alkanes with little C C bond cleavage. More importantly, owing to the significant promotion effect of NbO x species on C O bond cleavage and the mild reaction conditions, the C C cleavage was considerably restrained, and the catalyst showed an excellent activity and stability for the hydrodeoxygenation of palmitic acid with almost no decrease in hexadecane yield (94–95 %) in a 150 h time-on-stream test.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）