Nanomaterials
·
2024
·Vol. 14
·期 7
·608
·
IF 4.4
Wei Liu,Yang Zou,Yuang Chen,Zijian Lei,Lili Zhao,Lixin Song
This work involves the introduction of niobium oxide into lanthanum aluminate (LaAlO3) via a conventional solid-state reaction technique to yield LaAlO3:Nb (LaNbxAl1−xO3+δ) samples with Nb5+doping levels ranging from 0.00 to 0.25 mol%. This study presents a comprehensive investigation of the effects of niobium doping on the phase evolution, defect control, and reflectance of LaNbxAl1−xO3+δpowder. Powder X-ray diffraction (XRD) analysis confirms the perovskite structure in all powders, and XRD and transmission electron microscopy (TEM) reveal successful doping of Nb5+into LaNbxAl1−xO3+δ. The surface morphology was analyzed by scanning electron microscopy (SEM), and the results show that increasing the doping concentration of niobium leads to fewer microstructural defects. Oxygen vacancy defects in different compositions are analyzed at 300 K, and as the doping level increases, a clear trend of defect reduction is observed. Notably, LaNbxAl1−xO3+δwith 0.15 mol% Nb5+exhibits excellent reflectance properties, with a maximum infrared reflectance of 99.7%. This study shows that LaNbxAl1−xO3+δpowder materials have wide application potential in the field of high reflectivity coating materials due to their extremely low microstructural defects and oxygen vacancy defects.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·Vol. 27
·期 28
·14884-14895
·
IF 2.9
Jiatai Wang,Chao Fan,Yuanyuan Li,Yan Tan,Xuchao Zhang,Jiting Li,Hongyun Liu,Xiaohong Ma,Changjuan Deng,Jian Li
LiNixCoyMn1−x−yO2 cathode materials have long been recognized as one of the most promising candidates for lithium-ion batteries. In order to increase their production capacity and reduce costs, NCM cathode materials are currently being developed in the direction of high nickel and low cobalt contents. However, these cathodes face serious challenges, such as structural instability, capacity loss, and poor rate capability. Despite extensive research, problems such as structural degradation and capacity loss under high-voltage conditions remain unresolved. In this work, we successfully prepared Nb5+-doped LiNi0.9Co0.01Mn0.09O2 cathodes by incorporating Nb2O5 into Ni0.9Co0.01Mn0.09(OH)2 precursor powders. Nb5+ doping not only expanded the spacing of lithium layers, facilitating the diffusion of lithium ions, but also led to the formation of Nb–O bonds, enhancing structural stability and improving cycle performance. Electrochemical tests indicated that at a doping ratio of 1%, the first discharge specific capacity of the modified sample was 178.55 mAh g−1 at 1.0C, with a capacity retention of 92.69% after 100 cycles. Furthermore, the initial discharge specific capacity of the NCM-1.0Nb sample was up to 215.58 mAh g−1 at high voltages of 2.5–4.5 V, while after 100 cycles, it was 188.73 mAh g−1, with a cycle retention rate of 87.54%. The electrochemical cycling performance of NCM was thus significantly improved after Nb5+ doping. Therefore, appropriate Nb5+ doping is a convenient and effective modification approach to obtain nickel-rich cathodes with excellent performance.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2026
·
IF 4.3
Qingyuan Niu,Penghui Ma,Feng Luo,Xingyu Liu,Shuxin Yin,Xin Huang,Yumin Song
Red fluorescent powder has important applications in various fields such as display and lighting. In this paper, Eu 3+ /Nb 5+ co-doped SrTiO 3 fluorescent material was synthesized by hydrothermal method, and its phase structure, microstructure, luminescence properties, thermal stability and luminescence dynamic characteristics were systematically characterized. The results showed that under 395 nm near-ultraviolet excitation, the material emitted high-purity Eu 3+ characteristic red light at 612 nm; when the Eu 3+ doping content was 7 mol% and Nb 5+ was 3.5 mol%, the luminescence intensity was increased by 259% compared with single-doped Eu 3+ ,and the absolute quantum efficiency increased. Nb 5+ plays a dual role in this process, namely charge compensation and energy transfer modulation: On one hand, it inhibits the formation of lattice defects through charge balance between sites; on the other hand, it constructs an efficient light absorption center, enabling ultrafast energy transfer from the matrix to Eu 3+ . This material has stable color properties within the temperature range of 303-463 K, with no obvious color shift, and the thermal quenching activation energy is 0.34 eV, showing excellent thermal stability. This efficient and stable red fluorescent powder prepared by the Eu 3+ /Nb 5+ co-doping strategy has broad application prospects in near-ultraviolet excitation high color rendering index white LED and anti-counterfeiting encryption fields.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Zelai Cheng,Xi Wang,Xingyu Huo,Yulan Jing,Hua Su
Ni 0.42-x/3 Nb x /3 Cu 0.18 Zn 0.4 Mn x Fe 1.98− x O 4− δ ( x = 0–0.1) materials, possessing a high saturation magnetization, high dielectric constant, and narrow ferromagnetic resonance linewidth, were prepared via the solid-phase reaction method. The cation distribution, as well as the dielectric and gyromagnetic properties, were studied in detail. Mn 2+ and Nb 5+ incorporated in the lattice occupy tetrahedral site, causing the redistribution of cation and the reduction of A–B superexchange interaction. This leads to an increase in saturation magnetization followed by a decrease. The introduction of appropriate amounts of Mn 2+ and Nb 5+ ions reduces the magnetocrystalline anisotropy constant | K 1 | and thus reduces the ferromagnetic resonance linewidth ( ΔH ). Furthermore, high polarisability of Mn 2+ and Nb 5+ causes the increase in the dielectric constant of the ferrites. At x = 0.08, excellent gyromagnetic and dielectric properties, including a high dielectric constant ( ε ’ = 15.4@100 MHz), high saturation magnetization (4π M s = 4577 G), and narrow ferromagnetic resonance linewidth (Δ H = 129 [email protected] GHz) for the NiCuZn ferrite, was achieved. Finally, a K-band microstrip circulator operating at 20.8 to 28 GHz was designed. The simulation showed that the isolation of the circulator in the working frequency band is greater than 20 dB, showing the potential of the prepared ferrites in microwave circulators.
研究领域:
材料科学
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电子工程
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高影响因子
ACS Applied Electronic Materials
·
2026
·Vol. 8
·期 17
·7601-7616
·
IF 4.7
Yao Zhiqian,Zhong Wei,Wei Haoshan,Zhang Jie,Zhang Yong,Zhang Xueru,Cui Jiewu,Wang Yan,Liu Jiaqin,Wu Yucheng
With the rapid advancement and widespread adoption of millimeter-wave technology, developing high-performance microwave-absorbing materials has become critical for addressing electromagnetic interference and radiation pollution. To meet electromagnetic compatibility requirements in the 18−40 GHz frequency range, this study proposes a Nb 5+ -Mn 2+ cosubstitution strategy and fabricates Ba(NbMn) x Fe 12-2x O 19 absorbers via a sol-gel method. The results show that increasing the substitution ratio (X) modifies ion occupation, shifting the absorbers’ natural resonance frequency to the 21 GHz and 35 GHz atmospheric windows while broadening the microwave absorption bandwidth. Specifically, when X = 0.3, the absorber achieves an absorption peak of −43.37 dB in the K-band with an effective absorption bandwidth (EAB) of 6.46 GHz. When X = 0.2, it exhibits a superior absorption peak of −54.51 dB in the Ka-band, accompanied by an ultrabroad EAB of 12.87 GHz. The mechanism analysis reveals that Nb 5+ -Mn 2+ cosubstitution constructs a synergistic magnetoelectric loss system: it enhances magnetic loss, triggers multidielectric polarization, and optimizes impedance matching which collectively enables excellent broadband microwave absorption through magnetoelectric synergy. This work provides a viable strategy for designing high-frequency microwave absorbers and highlights the significant potential of Nb 5+ -Mn 2+ cosubstituted M-type barium ferrites in electromagnetic wave absorption applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 10
·761
·
IF 3.2
Wang Yongyuan,Li Xuyin,Xu Chaoyong,Cao Jianchun
Expanding the stable voltage window and specific capacitance of supercapacitor electrode materials remains a key scientific challenge due to the low energy density of supercapacitors. In this study, starting from the problem of low specific capacitance caused by the limited electron transfer rate due to the low conductivity of MnO 2 , a simple and economical hydrothermal method was used to doping different contents of Nb 5+ ions, which replaced some Mn 4+ ions in the α-MnO 2 lattice, thereby causing certain changes in the charge density and band structure of α-MnO 2 , and effectively improving its conductivity. In addition, Nb 5+ -doped α-MnO 2 effectively alters its morphology and surface area, providing a large surface area for ion and electron transport. The optimized Nb-MnO 2 electrode has a voltage window widened from 0.8 V to 1.2 V in a 1 M Na 2 SO 4 electrolyte, with a specific capacitance of 587 F/g with in the 1.2 V wide voltage window, while the undoped MnO 2 has a specific capacitance of only 131 F/g. A 2 V asymmetric supercapacitor is constructed with activated carbon AC as the negative electrode, providing a high energy density of 57 Wh/kg at a power density of 1010 W/kg in a 3 M KOH electrolyte. In addition, at a current density of 5 A/g, the capacitance retention rate of 84.85% was maintained after 5000 charge–discharge cycles. This work is a valuable foundation for the future exploration of wide voltage window and high-performance aqueous electrolyte asymmetric supercapacitors.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64796-64804
·
IF 5.6
Zhenghuang Quan,Zhoufu Wang,Hao Liu,Yan Ma,Shen Zhou,Pingtao Fang,Chao Shu
Yttrium oxide is widely recognized as a critical refractory material for superalloy purification smelting, owing to its high melting point, excellent vacuum chemical stability, and low alloy wettability. However, its inherent brittleness and high thermal expansion coefficient lead to poor thermal shock resistance, which severely restricts its practical industrial applications. To address this limitation, this study utilized La 3+ /Nb 5+ co-doping to fabricate Y 2 O 3 -based composites and systematically investigated their phase structure, microstructure, and overall properties. XRD Rietveld refinement and density functional theory (DFT)-based first-principles simulations confirmed that La 3+ preferentially substitutes Y 3+ at the Y1 lattice site, while Nb 5+ occupies the Y2 site, inducing significant lattice distortion and generating cation vacancies for charge balance. Microstructural observations revealed that co-doping triggers bimodal grain growth-characterized by small, loosely bonded grains with low Nb 5+ content and large grains containing intergranular pores attributed to high Nb 5+ substitution-resulting in increased apparent porosity but enhanced material toughness. Mechanical and thermal shock tests showed that while room-temperature flexural strength decreases, thermal shock resistance is drastically improved. When the La 3+ /Nb 5+ co-doping molar ratio was Y 2 O 3 : La 2 O 3 : Nb 2 O 5 = 1:0.050:0.050 (corresponding to the YLN10 sample), the composite exhibited the optimal overall performance: its room-temperature flexural strength reached 45.57 MPa, residual strength retention after thermal shock was 58.43 %, and elastic modulus retention was 87.91 %, effectively balancing mechanical properties and thermal shock stability. These improvements are primarily attributed to pore-mediated thermal stress dissipation and crack deflection effects. This work demonstrates that La 3+ /Nb 5+ co-doping is an effective strategy to balance the mechanical rigidity and thermal shock stability of Y 2 O 3 , providing a valuable reference for optimizing refractory materials for high-temperature superalloy smelting.
研究领域:
材料科学
·
无机非金属材料
·
高温功能陶瓷
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固态化学
·
计算材料学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Chao Ye,Wenqin Ling,Xiaowei Huang,Yao Wu,Naigen Zhou,Xuerui Yang
Olivine-structured LiMn x Fe 1-x PO 4 (LMFP) has garnered significant attention as a cathode material for lithium-ion batteries (LIBs) due to its high energy density and low cost. However, its widespread application is limited by its inherently low electronic and ionic conductivities, as well as structural instability arising from the Jahn-Teller distortion of Mn 3+ ions and interfacial side reactions. To address these challenges, this study developed an innovative synergistic modification strategy combining Nb 5+ doping with second-time carbon coating to prepare high-performance LiMn 0.6 Fe 0.4 PO 4 /C cathode materials. Nb 5+ doping stabilizes the crystal structure during cycling by strengthening M-O bonding interactions, thus effectively alleviating the Jahn-Teller distortion of Mn 3+ . Meanwhile, uniform carbon coating layer effectively suppresses electrolyte attack on the material and mitigates Mn dissolution. Furthermore, the synergistic effects of Nb 5+ doping and second-time carbon coating significantly enhance the Li + /e − transport efficiency of the material by narrowing the band gap and constructing a continuous conductive network. As a result, the dual-modified LMFP/DC-2Nb electrode exhibits significantly enhanced cycling stability and rate capability, delivering an initial discharge capacity of 158.3 mAh g −1 at 0.1 C and achieving 93.2 % capacity retention at 1 C after 700 cycles. Moreover, a high specific capacity of 156.2 mAh g −1 is delivered after 200 cycles at 1 C and 50 °C with negligible capacity fading, and a discharge capacity of 119.8 mAh g −1 is maintained even at a high rate of 5 C. The synergistic modification strategy holds great potential for application and offers broad prospects for the design and development of high-energy-density, low-cost, and high-performance lithium-ion batteries.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Xueni Sun,Xiaodan Liu,Jianan Feng,Yan Li,Chunhui Deng,Gengli Duan
Rapid and selective enrichment of phosphopeptides from complex biological samples is essential and challenging in phosphorylated proteomics. In this work, for the first time, niobium ions were directly immobilized on the surface of polydopamine-coated magnetic microspheres through a facile and effective synthetic route. The Fe 3 O 4 @polydopamine-Nb 5+ (denoted as Fe 3 O 4 @PD-Nb 5+ ) microspheres possess merits of high hydrophilicity and good biological compatibility, and demonstrated low limit of detection (2 fmol). The selectivity was also basically satisfactory (β-casein:BSA = 1:500) to capture phosphopeptides. They were also successfully applied for enrichment of phosphopeptides from real biological samples such as human serum and nonfat milk. Compared with Fe 3 O 4 @PD-Ti 4+ microspheres, the Fe 3 O 4 @PD-Nb 5+ microspheres exhibit superior selectivity to multi-phosphorylated peptides, and thus may be complementary to the conventional IMAC materials.
研究领域:
生物化学
·
分析化学
·
蛋白质组学
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·110528
·
IF 4.316
Liangjun Zhang,Li Xiao,Jiangfeng Zheng,Hua Wang,Han Chen,Yirong Zhu
Layered LiNixMn1−xO2 structures with high discharge specific capacity and low cost are anticipated as the next-generation of high-energy density cathode active materials. However, the mixed arrangement of Li+ and Ni2+ in the cathode materials affects structural stability. Here, Nb5+ was doped into the structure of LiNi0.8Mn0.2O2 (NM82) to broaden the lithium-ion migration channels and alleviate the degree of ion mixing. LiNbO3 particle was coated on the surface of LiNi0.8Mn0.2O2 to form a spherical compound and reduce the erosion of HF and the dissolution of transition metals, which helped ameliorate the cyclic and structural stabilities of cathode materials. NM82 modified 1% Nb2O5 (LN/NM82-1.0) exhibited maximum discharge specific capacitance (177.7 mAh g−1 at 1.0C following 200 cycles) and excellent thermal stability (189.0 mAh g−1 at 1.0C following 200 cycles at 60 °C). The corresponding capacity retentions of this material were 87.54% and 85.37%, as LiNbO3 particle coating on the surface of NM82 decreased polarization and charge transfer resistor. Nb5+ in the host structure suppressed structural degradation and enhanced discharge capacity. This study determined the influence of Nb5+ substitution and LiNbO3 cladding on the structure and surface of LiNi0.8Mn0.2O2 and provides insights into commercial application of high-energy density layered structures of LiNixMn1−xO2 cathode materials.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Heng Li,Zhi Li,Jiali Liu,Shuang Cao,Jiarui Chen,Hui Hu,Changmeng Guo,Xiaoyan Zhang,Xianyou Wang
With the advantages of low cost and high energy density, Co-free Li-rich layered oxides (LROs) are a potential next-generation lithium-ion battery cathode material for energy vehicles. However, LROs suffer from the defects of irreversible O-redox and low conductivity, producing poor cycling stability and rate performance and low initial Coulombic efficiency (ICE). In this work, the ammonium niobium oxalate (C4H4NNbO9·nH2O) treatment strategy is proposed to realize oxygen vacancy construction and Nb5+ doping on the surface of the LRO material. The results show that the optimized sample LRO-Nb-0.5 presents satisfactory electrochemical performance; for example, at 1C, the specific discharge capacity is 209.77 mAh g–1 and a capacity retention rate is 93.22% after 300 cycles. In addition, the high-rate capability is distinctly enhanced; a specific discharge capacity of 178.70 mAh g–1 can be achieved at 5C for LRO-Nb-0.5. Therefore, Nb5+ doping and oxygen vacancy regulation can be significant explorations for the promotion of the electrochemical performance of Co-free Li-rich materials.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Yi-Ying Wang,Dan-Dan Shi,Xing Han,Hong-Yan Guo,Jia-Jia Cao,Kai-Peng Zhong,Nai-Cai Xu,Shao-Ju Bian
In recent years, the technology for rapid extraction of lithium from salt-lake brines has attracted extensive attention. Spinel-structured lithium manganese oxide has been reported to be a promising adsorbent owing to its large lithium adsorption capacity and excellent selectivity. However, its application is limited by manganese dissolution. In this study, NbCl 5 was used as a dopant to prepare high-valence Nb 5+ -doped H 1.6 Mn 1.6 O 1.6 lithium-ion sieves (Nb-doped lithium-ion sieve) hydrothermal and solid-state methods. The results have shown that Nb 5+ doping could significantly increase the average manganese oxidation state, suppress Jahn-Teller distortion and enhance structural stability by Nb–O bonding. Meanwhile, density functional theory (DFT) simulation also demonstrated the enhanced stability caused by Nb doping. The Nb doped lithium-ion sieves presented an excellent Li + selectivity in brine from West Tai Kinel Salt Lake. After 10 cycles of adsorption–desorption, the adsorbent achieved a capacity of 29.15 mg/g, and the capacity retention rate was over 80%, while the manganese loss was only 4.0%, which was significantly better than that of the corresponding adsorbent without modification. This work provides a simple strategy to prepare stable and high-performance manganese-based lithium-ion sieves.
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高影响因子
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