CHEMISTRY-A EUROPEAN JOURNAL
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2022
·Vol. 28
·期 67
·e202202432
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IF 5.02
Jujun Yuan,Haishan He,Xiaofan Li,Yunfei Gan,Meiqi Mu,Huajun Yu,F. Kuang,Xiaokang Li,Xianke Zhang,Jun Liu
Nb 2 O 5 possesses superior fast Li + storage capability for LIB anodes, benefiting from its fast pseudocapacitive behavior and low volumetric change within the cycling processes. However, the poor electric conductivity for Nb 2 O 5 restricts its reaction kinetics and rate property. Herein, Nb 2 O 5 /carbon (C) submicrostructures are fabricated by solvothermal method followed by calcination process. The Nb 2 O 5 /C submicrostructures exhibit outstanding rate behavior and cyclic performance (332 (194) mAh g −1 after 1000 cycles at 1 (5) A g −1 ). The superior electrochemical property is attributed to the distinctive structure for Nb 2 O 5 /C submicrostructures, in which Nb 2 O 5 nanoparticles uniformly distributed within Nb 2 O 5 /C composite can protect Nb 2 O 5 nanoparticles from agglomeration, and the porous carbon matrix can enhance electron/ion conductivity. This work furnishes a novel strategy for fabricating Nb 2 O 5 /C submicrostructures with superior Li + storage performance, which can be potentially used to design other metal oxide/C submicrostructures for second battery anode. Graphical Nb 2 O 5 /Carbon (C) submicrostructures are fabricated by using a solvothermal method followed by a calcination process. As lithium ion batterie anodes, the Nb 2 O 5 /C submicrostructures exhibit outstanding rate behavior and cyclic performance. The superior electrochemical property is attributed to the distinctive structure for Nb 2 O 5 /C submicrostructures, in which Nb 2 O 5 nanoparticles uniformly distributed within Nb 2 O 5 /C composite can protect Nb 2 O 5 nanoparticles from agglomeration, and the porous carbon matrix can enhance electron/ion conductivity.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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功能材料
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DOI
高影响因子
MATERIALS LETTERS
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2020
·
IF 3.204
Yun Zhang,Shihua Ding,Tianxiu Song,Yingchun Zhang
CoSnNb 2 O 8 ceramic with medium-permittivity was initially generated. Compositionally induced phase formation was identified by X-ray diffraction. Tetragonal rutile-type CoSnNb 2 O 8 was obtained from the reaction of SnO 2 with intermediate phase CoNb 2 O 6 . Both the dielectric constant ε r and quality factor Q × f initially increased with the sintering temperature, reaching the maxima at around 1225 °C, and declined thereafter. They were discussed based on the ionic polarizabilities and packing fraction, respectively. The temperature coefficient of resonant frequency τ f primarily depended on the Nb-site bond valence, as well as oxygen octahedra distortion. When sintered at 1225 °C, the CoSnNb 2 O 8 ceramic exhibited optimum properties with ε r = 31.8, Q × f = 43,000 GHz, and τ f = 35.01 ppm/°C.
研究领域:
材料科学
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无机非金属材料
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介电物理
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功能陶瓷
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微波材料
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qing Ji,Weiheng Chen,Xiaoping Chen,Xiaoyan Wang,Qingyu Dong,Shanshan Yin,Yanbin Shen,Peter Müller-Buschbaum,Ya-Jun Cheng,Yonggao Xia
Niobium pentoxides (Nb2O5) present great potential as next-generation anode candidates due to exceptional lithium-ion intercalation kinetics, considerably high capacity, and reasonable redox potential. Although four phases of Nb2O5 including hexagonal, orthorhombic, tetragonal, and monoclinic polymorphs show diverse characteristics in electrochemical performance, stable lifetime, high specific capacity, and fast intercalation properties cannot be delivered simultaneously with a single phase. Herein, this issue is addressed by generating a homogeneous mixture of orthorhombic and monoclinic crystals at the nanoscale. Reversible lithium-ion intercalation/deintercalation of the monoclinic phase is achieved, and exceptional lithium storage sites are created at the interface of the two phases. As a result, electrochemical features of stable lifetime from the orthorhombic phase and high specific performance from the monoclinic phase are harmoniously combined. This dual-phase Nb2O5/C nanohybrids deliver as high as 380 mA h g–1 (0.01–3.0 V) and 184 mA h g–1 (1.0–3.0 V) after 200 cycles. The essential principle of property enhancement is further confirmed through in situ XRD measurements and DFT calculations. The dual-phase concept can be further applied on electrodes with multiphases to achieve high electrochemical performance.
研究领域:
材料科学
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电化学
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能源存储
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Zhishuai Wang,Fengyun Su,Hailong Cao,Mengzhen Tian,Xiang Li,Haiquan Xie,Xiaoli Jin,Zhengdao Li,Xin Ying Kong
Amidst the impending energy crisis and escalating concerns about global warming, photocatalytic reduction of carbon dioxide (CO 2 ) emerges as a promising solution. However, the practical application of this technology has been hindered by challenges such as the poor photoresponse of existing photocatalysts toward visible light, inefficient separation efficiency of photoinduced electron-hole pairs, and subpar product selectivity. This work simultaneously addresses these limitations by enhancing the activity of photocatalytic CO 2 reduction through the strategic incorporation of nickel oxide (NiO) onto niobium pentoxide (Nb 2 O 5 ). In this study, Nb 2 O 5 was prepared using the hydrothermal and calcination methods, culminating in the synthesis of NiO-supported Nb 2 O 5 achieved through the photodeposition method. The resulting 2 %-NIONBO photocatalyst with the optimal loading of NiO exhibited a remarkable methane (CH 4 ) production yield of 29.65 μmol/g/h, a striking 6.2-fold improvement over solitary NBO. In addition, the useful carbon monoxide (CO) fuel was also detected from the photoreduction of CO 2 , where 2 %-NIONBO exhibited a CO yield of 7.22 μmol/g/h, demonstrating a 3.4-fold enhancement over NBO, along with an outstanding CH 4 selectivity of 80.42 %. This study provides insights into the design and development of Nb-based photocatalysts for significantly enhanced efficiency in photocatalytic CO 2 reduction, paving the way for advancements in sustainable energy solutions and addressing environmental issues.
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高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Zijie Yang,Hao Zhang,Zhaoyan Luo,Chunlei Bian,Yinnan Qian,Siyuan Zhu,Lei Zhang,Qianling Zhang,Chuanxin He,Junjie Ge,Xiangzhong Ren
Recent efforts in proton-exchange membrane water electrolysis (PEMWE) focus on developing superior catalysts and membrane electrode assemblies (MEAs) to achieve efficient expression of performance low-IrO x -loaded PEMWE systems. Herein, we report an infusive result that, through anchoring amorphous IrO x clusters onto Nb 2 O 5 support, we were able to switch the reaction pathway and optimize the MEA microenvironment. Specifically, the near-ideal Ir–Ir atomic configuration and the strong coupling strength of the *O and *OH species on adjacent iridium atoms in IrO x /Nb 2 O 5 facilitate direct O*–O* radical coupling to form an intermediate O*–O*–Ir configuration during acidic OER without generating OOH* species. This configuration significantly enhances the OER Ir mass activity from 23.1 to 424.2 A g Ir −1 at 1.5 V, while reducing the overpotential (@10 mA cm −2 ) from 339 to below 190 mV compared to IrO 2 . Furthermore, the IrO x /Nb 2 O 5 catalyst also addresses the electron and proton transport issues in low-Ir-loaded MEA, through tuning the band structure and wettability of the low-Ir-loaded catalyst layer and Ti porous transport layer interface. The resulting catalysts achieve ultra-low overpotentials in a PEMWE system, with cell voltages of 1.57 and 1.83 V at current densities of 1 and 3 A cm −2 and stable operation under industrial conditions for 1000 h.
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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可再生能源
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 3
·1541-1552
·
IF 1.843
Zhang Zhenwei,Ma Xiaoshi,Yue Chuanjun,Wei Xuejiao,Liu Baoliang
Furfuryl ethyl ether (FEE), an important gasoline additive, is synthesized by a one-step reductive etherification of furfural (FF) by Nb 2 O 5 nanowires loaded with Pd as catalysts. Compared with other materials, the catalyst had a suitable synergistic effect between the reductive sites Pd 0 and the acidic sites of Nb 2 O 5 nanowires, effectively improving the yield of FEE. In ethanol, at 453 K and under 1 MPa H 2 pressure, the catalyst 1.0 wt% Pd/Nb 2 O 5 showed excellent catalytic performance in the reductive etherification reaction, and the yield of FEE reached 87.7%, higher than Pd/C whose yield was 81%. This result showed a feasible way to simplify the FEE preparation process, thus reducing production costs.
研究领域:
催化化学
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绿色化学
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纳米材料化学
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能源化工
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有机合成
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DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2026
·Vol. 56
·期 7
·134
·
IF 3.7
Jiang Ye,Yin Yanjun,Nie Jiaxin,Li Juan,Bao Zhiyong,Ma Zili
Niobium pentoxide (Nb 2 O 5 ) has been explored as photoactive material for photoelectrochemical water splitting, yet it suffers from limited visible light absorption and poor charge carrier separation. In present study, we fabricated Nb 2 O 5 thin films on fluorine-doped tin oxide substrates via hydrothermal synthesis, followed by coupling with Fe 2 O 3 overlayer and further decoration with FeNiO x cocatalyst. Structural characterizations, including such as X-ray diffraction (XRD), scanning electron microscopy, confirmed the formation of phase-pure Nb 2 O 5 with sea urchin-like nanospheres and successful decoration of Fe 2 O 3 overlayer and FeNiO x cocatalyst. The Fe 2 O 3 modification induced a red shift in absorption onset to the visible region, enhancing light utilization. The optimized FTO/Nb 2 O 5 /Fe 2 O 3 photoanode exhibited over 20-fold photocurrent enhancement at 0.3 V vs. Ag/AgCl compared to bare Nb 2 O 5 , attributed to improved charge separation via heterojunction formation. Further integration of FeNiO x cocatalyst boosted the photocurrent by 55 times, owing to accelerated surface water oxidation kinetics and reduced charge transfer resistance. These findings demonstrate the synergistic role of Fe 2 O 3 heterojunction and FeNiO x cocatalyst in advancing Nb 2 O 5 -based photoanodes for PEC water splitting. Graphical abstract The alternative text for this image may have been generated using AI.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2026
·
IF 6.6
Binhao Zhang,Bin He,Guangliang Chen,Kunyan Wang,Tongtong Li,Ying Tao,Jun Huang,Peisong Tang
A grape-like FeOOH-Nb 2 O 5 -CoO heterostructure engineered on the DBD plasma-modified Co foam for OER. • Plasma treatment endows a special 3D physio-chemical interface for seawater splitting . • The overpotential of FeOOH- Nb 2 O 5 -CoO/PCF for transferring j 1000 is only372 mV 1 M KOH. • DFT calculations disclose the FeOOH-CoO heterointerface lowers the OER energy barrier. Seawater electrolysis represents an attractive approach for producing the high-purity hydrogen. Nevertheless, the high concentration of chloride ions (Cl − ) in seawater leads to severe corrosion of electrodes, posing a major obstacle to the widespread adoption of seawater splitting for green hydrogen generation. Herein, a grape-like iron-niobium-cobalt metal oxide (FeOOH-Nb 2 O 5 -CoO/PCF) is in-situ engineered on the cobalt foam which is modified by a dielectric barrier discharge (DBD) plasma (PCF). Noted that the plasma treatment endows the PCF substrate with critical properties for engineering electrocatalysis: the obtained 3D hierarchical architecture facilitates electrolyte access, the caused interfacial bonding ensures an excellent electrocatalytic durability, and the enhanced surface chemistry accelerates gas bubble release. The optimized FeOOH-Nb 2 O 5 -CoO/PCF electrode achieves an industrial-level current density of 1000 mA cm −2 at a low overpotential of 372 mV in 1 M KOH, and merely 317 mV for transferring a current density of 100 mA cm −2 ( j 100 ) in an aggressive alkaline seawater. Moreover, the FeOOH-Nb 2 O 5 -CoO/PCF maintains an ultra stability for 100 h (1 M KOH) and 317 h (alkaline seawater) with chronoamperometry ( I-t ) tests. Based on Density Functional Theory (DFT) calculations, the constructed heterointerface between CoO and FeOOH phase effectively modulates the electronic configuration of catalyst and lowers the energy barrier of the rate-determining step with the synergistic effect of Nb 2 O 5 , thereby synergistically promoting the oxygen evolution reaction (OER). This work offers a viable pathway for designing highly active and stable electrocatalysts fitting for seawater splitting. A grape-like FeOOH-Nb 2 O 5 -CoO heterostructure is in-situ hydrothermally fabricated on DBD-plasma-etched cobalt foam for a high efficient OER wtih alkaline seawater. In 1 M KOH, it achieves 372 mV at an industrial-level 1000 mA cm −2 with a Tafel slope of 53.8 mV dec −1 . In an alkaline seawater, it requires only 317/359/391 mV at 100/300/500 mA cm −2 . At 500 mA cm −2 , a long-term stability reaches 100 h in 1 M KOH and 317 h in seawater. DFT confirms interfacial Co sites dominate OER activity, while Nb 2 O 5 provides anti-Cl − corrosion protection. This work offers a DBD-assisted pathway for engineering electrocatalysts to achieve a robust seawater electrolysis. Download: Download high-res image (177KB) Download: Download full-size image
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高影响因子
FUEL
·
2026
·
IF 7.8
Jian Wang,Yu Zhao,Tianhua Yang,Xinyong Diao,Yao Tong,Shuang Cui,Bingshuo Li,Rundong Li
Guaiacol, an important lignin-derived compound, presents a central challenge in the efficient upgrading of biomass into sustainable biofuels. Conventional conversion processes are often limited by dependence on corrosive acids, noble metals, or external hydrogen sources, leading to increased costs and safety concerns. In this study, we developed a hydrothermal conversion method that enables guaiacol to catechol transformation without the need for external hydrogen or inorganic acids. This was accomplished using transition-metal-based n Ni– y MoO x /Nb 2 O 5 catalysts capable of cleaving C–O bonds. The results showed that the Ni/MoO x ratio was critical in governing the formation of the NiMoO 4 spinel phase while inducing a strong metal–support interaction (SMSI) that directly affected the surface acidity and oxygen vacancy concentration. Using the 5Ni-5MoO x /Nb 2 O 5 catalyst (Ni/Mo = 1:1) at 300 °C for 2 h, 26.15% guaiacol conversion was achieved, with catechol selectivity 12.9-fold higher than in the noncatalytic system. This superior performance originated from a synergistic effect between the moderate acid strength and the high concentration of defective oxygen vacancies, which collectively drove the selective cleavage of the O–CH 3 bond. The produced catechol serves as a pivotal platform intermediate for synthesizing renewable fuel additives and advanced biofuel components. This study presents a sustainable catalyst design strategy for converting lignin resources into valuable biofuel precursors.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chao Peng,Xi Xie,Wenkang Xu,Tao Zhou,Ping Wei,Jianbo Jia,Kun Zhang,Yonghai Cao,Hongjuan Wang,Feng Peng,Rui Yang,Xiqiang Yan,Hui Pan,Hao Yu
Steering charge kinetics is one of the most urgent unsolved issues in photocatalysis. The effective spatial separation of photogenerated electron-hole pairs is particularly important in the design and controllable preparation of nano-photocatalysts. Herein, one-dimensional Nb 2 O 5 nanorod arrays with [0 0 1] orientation were grown in-situ on two-dimensional Nb 2 CT x MXenes through a facile hydrothermal method for the first time. Ag nanoparticles were then photodeposited on the Nb 2 O 5 nanorods to form hierarchical 0D/1D/2D nanohybrids. It was experimentally demonstrated that OH is predominantly adsorbed on Nb 2 CT x as termination groups, which resulted in a low work function (2.7 eV). Thanks to the unique structure, the highly active [0 0 1] Nb 2 O 5 nanorods afford high-efficiency photogeneration of electron-hole pairs, while the low-work-function OH terminated Nb 2 CT x allows for trapping holes, and Ag nanoparticles act as electron reservoir and sites of hydrogen evolution reaction (HER). The ternary Ag/Nb 2 O 5 @Nb 2 CT x nanohybrids reached a record HER activity (682.2 and 824.2 μmol·g -1 h −1 use methanol and glycerol as sacrificial agents, respectively) among the niobium-based photocatalysts, demonstrating the potential of MXenes as a platform for the synthesis of high-performance heterojunction structures, where the tunable electronic property is a key factor.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 11
·3081-3090
·
IF 9.405
Lin Dong,Yu Xin,Xiaohui Liu,Yong Guo,Chih-Wen Pao,Jeng-Lung Chen,Yanqin Wang
Transformation of lignin into high value-added phenolics is of great significance but extremely challenging. Herein, we report a single-step process for the preparation of phenolics from both 2-methoxy-4-propylphenol (one of the major products derived from lignin) and lignin oil (lignin-derived monomers) over Au-based catalysts. In this process, the desired Ar–OH substituents can be maintained and phenolics can be obtained with high yields. The performance of the Au/Nb2O5 catalyst is compared with those of Au/TiO2, Au/Al2O3 and Au/ZrO2 and it is shown that Au/Nb2O5 has high activity, excellent stability and remarkable selectivity to phenolics, with the yields of phenolics reaching 84.2% for 2-methoxy-4-propylphenol and 66.7 wt% for lignin oil. The detailed studies reveal that the hydrodeoxygenation of 2-methoxy-4-propylphenol undergoes two-steps, i.e., hydrolysis to propylcatechol catalyzed by the acid sites of supports, and the hydrogenolysis of propylcatechol to propylphenol realized by the synergistic effect between Au and the supports. It is found that the high hydrodeoxygenation activity of Au/Nb2O5 depends on both the electron-rich Au nanoparticles and the Nb2O5 support with the efficient cleavage of the Caromatic–O linkage. This study provides a new catalytic system towards highly efficient and selective conversion of lignin oils to valuable phenolics.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin-Jie Guo,Yi-Lei Li,Feng Xu,Yuan Zhuang,Xuan-Ru Zhang,Zu-Heng Hu,Le-Zhong Li
This study investigates the effects of co-doping Bi 2 O 3 and Nb 2 O 5 on the microstructure, electrical, and magnetic properties of NiZnCo ferrites. The NiZnCo ferrites with fixed 0.3 wt.% Bi 2 O 3 doping and different Nb 2 O 5 doping contents (0–0.8 wt.%) were synthesized by state-phase reaction method. The study shows that all Ni 0.55 Zn 0.35 Co 0.1 Fe 2 O 4 samples co-doped with Bi 2 O 3 and Nb 2 O 5 exhibit a single-phase spinel structure. With increasing Nb 2 O 5 concentration, the average grain size of the ferrites increases continuously, while the porosity decreases. Furthermore, the real part of the dielectric constant rises to 2.42×10 5 , and the DC resistivity decreases to 3.08×10 5 Ω·m. The saturation magnetization varies from 40.78 to 53.29 emu/g, and the coercivity ranges from 18.00 to 19.14 Oe. Notably, among samples with different Nb 2 O 5 doping levels, the ferrite co-doped with 0.2 wt.% Nb 2 O 5 exhibits the highest initial permeability of 111.24, which is approximately four times higher than that of pure NiZnCo ferrite. These results indicate that Bi 2 O 3 –Nb 2 O 5 co-doping not only effectively regulates grain growth and porosity but also achieves a synergistic optimization of dielectric and magnetic properties. The introduction of an appropriate amount of Nb 2 O 5 leads to high initial permeability and moderate DC resistivity, helping to reduce mismatches between magnetic and dielectric losses. The combination of high dielectric constant and favorable magnetic response enhances the impedance matching and energy dissipation capabilities of the material for electromagnetic waves. Therefore, this co-doped ferrite offers a promising material candidate for the design of electromagnetic absorbers and soft magnetic components.
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高影响因子
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