RARE METALS
·
2020
·Vol. 40
·期 2
·425-432
·
IF 2.161
Huang Min,Liu Ji-Xin,Huang Peng,Hu Hai,Lai Chao
A two-dimensional (2D) SnNb 2 O 6 /amino-functionalized graphene (En-RGO) nanocomposite with a representative 2D–2D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries. The SnNb 2 O 6 nanosheets are evenly anchored with the amino-functionalized graphene through electrostatic attractive interplay between the negatively charged SnNb 2 O 6 and positively charged En-RGO after modification. As a result, a remarkable reversible capacity of 300 mAh·g −1 was obtained at 50 mA·g −1 , and significantly, the En-RGO electrode could also deliver ultra-long calendar life up to 1900 cycles with a high reversible capacity of 200 mAh·g −1 at current of 500 mA·g −1 . Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism, and the capacitive contribution can even reach up to 90% at 1.2 mV·s −1 . Graphic abstract
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机化学
·
功能材料
·
电化学储能
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DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3426-3440
·
IF 2.3
Han Qi,Shi Yong,Han Yuchan,Chen Rui,Hou Yuelei,Li Jun
A series of niobium-based catalysts with carboxylated multi-walled carbon nanotube (C-CNT) as support were prepared by modified wet-chemical technique under ultrasonication. Three types of catalysts with active component niobium attached only on the inner or outer walls respectively, or mainly on the outer walls were obtained by adjusting the impregnation strategies. The catalysts were characterized systematically by SEM, TEM, XRD, Raman, FT-IR, XPS, and N 2 adsorption–desorption. It was found that niobia species was highly dispersed on the outer wall or the channels of C-CNT. There are abundant oxygen-containing groups on the catalysts. Strong chemical interactions between the support and Nb 2 O 5 are evident. The catalytic performances of the C-CNT-supported catalysts were evaluated for the selective oxidation of cyclopentene (CPE) to glutaraldehyde (GA) with 30 wt% aqueous H 2 O 2 as oxidant. The conversion of CPE and the selectivity to GA reached 98.3% and 59.3% respectively under the optimized conditions. No significant deterioration of the catalytic performance was found in the catalyst-cycling experiments, indicating the stability of the catalyst. Hot filtration experiments revealed that the catalytic reaction was heterogeneous. The good performance of the catalyst in ethanol makes the catalytic system of an excellent application prospect. Graphical
研究领域:
催化化学
·
材料科学
·
化学工程
·
纳米技术
·
有机化学
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DOI
高影响因子
Journal of Environmental Sciences
·
2015
·
IF 2.002
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng,Zhenwei Wu
A MnO x –NbO x –CeO 2 catalyst for low temperature selective catalytic reduction (SCR) of NO x with NH 3 was prepared by a sol–gel method, and characterized by NH 3 –NO/NO 2 SCR catalytic activity , NO/NH 3 oxidation activity, NO x /NH 3 TPD , XRD , BET, H 2 -TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicate that the MnO x –NbO x –CeO 2 catalyst shows excellent low temperature NH 3 -SCR activity in the temperature range of 150–300°C. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NO x adsorption. As the NO 2 content increases in the feed, water vapor does not affect the activity in NO 2 SCR. Meanwhile, water vapor significantly enhances the N 2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH 4 NO 3 into N 2 O.
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
表面科学
·
化学工程
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DOI
高影响因子
International Journal of Electrochemical Science
·
2026
·
IF 3.9
Haoliang Yu,Haipeng Wang,Shuzheng Wang,Xiaohong Hu
Rechargeable magnesium-lithium hybrid batteries (MLHBs) are promising for energy storage applications due to their high volumetric energy density, enhanced safety, and reliable performance. However, the advancement of MLHBs has been impeded by the low median discharge voltage and insufficient cycle life of cathode materials. In this work, NbSe 2 pre-intercalated with PY 14 + ions is employed as the cathode for MLHBs, delivering a median discharge voltage as high as 1.30 V. The intercalation of PY 14 + effectively expands the interlayer spacing of the material, which provides wider diffusion channels for ion transport and reduces the migration barrier. This structural modification significantly enhances the rate capability of the material, enabling a reversible capacity of 58.71 mAh g -1 even at a high current density of 2000 mA g -1 . Simultaneously, PY 14 + ions act as structural pillars, mitigating the collapse of the layered structure during cycling and thereby improving the cycling stability, with a capacity retention of 61.65% after 1000 cycles at 500 mA g -1 . Kinetic analyses and ex situ characterization confirm an increased contribution from the diffusion-controlled process and a highly reversible conversion reaction mechanism in the PY 14 + -intercalated NbSe 2 cathode. This study provides valuable insights for developing high-performance cathodes for MLHBs.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 9.8
Qianhui Ren,Bo Jin,Yiyang Li
Lithium‑sulfur (Li-S) batteries possess great theoretical specific capacity and energy density, low cost, and better safety, thus, they are deemed to be very promising batteries. However, they have also low active material utilization, shuttle effect, and volume expansion problems, which have brought serious obstacle to the commercial development of Li-S batteries. These problems can be refined via modifying polypropylene (PP) diaphragm. In this work, we design a heterostructure consisting of nitrogen-doped carbon (NC), metal niobium (Nb), and Co x Se 8 (Co 9 Se 8 and Co 6.8 Se 8 ) to modify PP. According to density functional theory (DFT) calculations, the presence of Nb in Nb-Co x Se 8 /NC results in fortified catalytic conversion capability toward lithium polysulfides (LiPSs). Furthermore, Co x Se 8 adsorbs the LiPSs to a substantial extent, mitigating the shuttle effect, which leads to enhanced use of the active substance during charging and discharging reactions. Simultaneously, the porous architecture mitigates the expansion in sulfur's volume. The electrochemical test consequence depicts that Li-S battery with Nb-Co x Se 8 /NC-PP diaphragm has a primary discharge capacity of 1449 mAh g −1 at 0.5 C, with a capacity retention rate of 68% after 100 cycles. It has also an initial discharge capacity of 868 mAh g −1 at 10 C in the rate performance test. Even with a high areal loading of 3.1 mg cm −2 , Li-S battery delivers an adequate electrochemical functionality. This study provides an idea for constructing heterostructured metal selenides to improve the electrochemical functionality of Li-S batteries.
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高影响因子
RARE METALS
·
2026
·Vol. 45
·期 8
·e70481
·
IF 12.1
Long Jiang,Zhuang Wu,Qi Fan,Shengchao Wang,Wenjie Zhang,Lijing Yu,Dirong Gong,Yunlei Zhou,Kun Liang
en This link goes to a English section zh This link goes to a Chinese section Lithium–sulfur batteries have attracted extensive interest owing to their exceptionally high theoretical energy density and environmental benignity. However, their practical performance remains severely constrained by intrinsic challenges, including the polysulfide shuttle effect and large volume expansion during cycling, which markedly compromise energy efficiency and fall far short of the requirements for commercialization. To address these challenges, we modify a commercial separator (PP) with a dual-transition-metal Mo 2 Nb 2 C 3 MXene, whose surface terminations are precisely regulated via distinct etching strategies, thereby substantially enhancing the electrochemical performance of lithium–sulfur batteries. Compared with cells employing the pristine commercial separator, all PP@Mo 2 Nb 2 C 3 -based cells deliver superior rate performance at a high current density of 3C. Notably, the PP@Mo 2 Nb 2 C 3 -Cl cell retains a high discharge capacity of 589 mAh g −1 after 200 cycles, nearly doubling that of the cell with the commercial PP separator (307 mAh g −1 ). At all tested C-rates, the PP@Mo 2 Nb 2 C 3 -based cells delivered higher discharge capacities than those employing the commercial PP separator. Overall, modification of Celgard 2500 with the dual-transition-metal Mo 2 Nb 2 C 3 MXene effectively suppresses the polysulfide shuttle, enhances sulfur utilization, and substantially prolongs the cycle life of lithium–sulfur batteries. This work provides valuable insights into the rational design and application of MXenes as functional modifiers for advanced lithium–sulfur batteries. 摘要 en This link goes to a English section zh This link goes to a Chinese section 锂硫电池因其高理论能量密度和对环境友好受到广泛关注,但其在工作中产生多硫化物引起的穿梭效应、体积膨胀等问题严重影响电池的效率,远不足以达到商业化的要求。针对这些问题,本文研究了双过渡金属Mo 2 Nb 2 C 3 MXene对商用Celgard 2500进行改性,通过不同的刻蚀方法调控Mo 2 Nb 2 C 3 MXene端基,进而有效提升了锂硫电池的性能。与商用Celgard 2500隔膜相比,所有基于PP@Mo 2 Nb 2 C 3 的电池在3C倍率下均表现出更优异的倍率性能。值得注意的是,PP@Mo 2 Nb 2 C 3 -Cl电池在200次循环后仍保持589 mAh g −1 的高放电比容量,几乎是使用商用Celgard 2500隔膜电池(307 mAh g −1 )的两倍。在不同倍率下,PP@Mo 2 Nb 2 C 3 电池均表现出比使用商用Celgard 2500隔膜电池更高的放电比容量。总体而言,采用双过渡金属Mo 2 Nb 2 C 3 MXene对Celgard 2500隔膜进行改性,能够有效抑制多硫化物穿梭,提高硫利用率,并延长锂硫电池的循环寿命。这项工作为合理设计和应用MXene作为先进锂硫电池的功能改性材料提供了有价值的见解。
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高影响因子
Communications Materials
·
2025
·Vol. 6
·期 1
·1-8
·
IF 9.6
Lin Qicai,Jin Junjie,Jiang Yongkang,Sheng Guan,Schwingenschlögl Udo,Wu Junwei,Tu Shaobo,Liu Xingjun,Zhang Xixiang
Al-ion batteries (AIBs) have emerged as a promising energy storage technology due to their high theoretical capacity, cost-effectiveness, and superior safety. However, the lack of stable and efficient cathode materials capable of reversible Al-complex ion (e.g., [AlCl 4 ] − ) insertion/extraction remains a critical challenge. In this work, we developed TiNbCT x MXene as a high-performance cathode material for AIBs, achieving remarkable capacity and cycling stability. Unlike symmetric-structured Ti 2 CT x , the TiNbCT x cathode leverages synergistic Ti–Nb bimetallic effects to enhance the electronic conductivity and electrochemical activity. Here we show, TiNbCT x delivers a high reversible capacity of 194 mAh·g −1 at 0.2 A·g −1 with 800-cycle stability. Through combined experimental characterization and density functional theory (DFT) calculations, we elucidate the kinetic mechanisms of energy storage, offering fundamental insights for the rational design of advanced cathode materials in AIBs.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Chengzheng Ye,Jiaming Song,Xin Zhao,Zijuan Ma,Jialong Ma,Yawen Liu,Shanbo Cui,Zhuo Wang,Guoshuai Ban,Feng Teng,Peng Hu,Haibo Fan
Nb₂SiTe₄, a layered narrow-bandgap van der Waals semiconductor, has been attracting more and more attention due to its high carrier mobility and excellent optical absorption properties. In this study, we exploited this material in the photoelectrochemical type photodetector (PD) to investigate its potential for energy saving optoelectronics. A simple high-temperature solid-state reaction method was utilized for synthesizing high quality Nb₂SiTe₄ crystals, and liquid-phase exfoliation was employed to prepare the corresponding nanosheets for the device construction. The photoelectric performances of the Nb₂SiTe₄ nanosheet PDs were characterized in a three-electrode system and broad spectral responses ranging from 400 to 900 nm were detected. The effects of dispersants, electrolyte, as well as light power density on the device performance were systematically investigated. At 0 V bias voltage, an optimal performance of the PDs was obtained in acidic testing environment upon illumination of the 400 nm light, and the highest photocurrent density of 0.72 μA cm⁻² and responsivity of 7.71 µA W⁻¹ were achieved. Besides, the device demonstrated fine long-term cycling and air stabilities. This work implies the potential of Nb₂SiTe₄ for being applied in broadband photodetection of self-powering devices.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yanli Wang,Can Liu,Xinyue Jiang,Yufei Cheng,Jie Wang,Lingxu Yang,Huijun Liu,Chaoliu Zeng
Coatings deposited via the disproportionation reaction of multivalent transition-metal ions in molten salts offer advantages of simple apparatus, straightforward processing, and the formation of metallurgically bonded interfaces with the substrate. In this study, high-quality niobium carbide and nitride coatings were fabricated for proton exchange membrane fuel cell (PEMFC) bipolar plates via disproportionation of Nb(IV) in molten salts. The effect of fluoride ions in the molten salt medium on the composition, microstructure, and properties of coatings deposited on austenitic stainless steel substrates was investigated. Results show that the addition of fluoride ions to NaCl-KCl molten salt effectively modulates the disproportionation rate of Nb(IV), enabling the formation of uniform and dense Nb x (C,N) y coatings on 304 SS. This regulation prevents excessive disproportionation of Nb(IV) and the consequent accumulation of niobium particles, which would otherwise accelerate the corrosion of the coating under galvanic conditions. Regular electrochemical tests demonstrated that the Nb x (C,N) y coating significantly improved the corrosion resistance of 304 SS. Moreover, even under an elevated potential of 1.0–1.6 V vs. SHE, the corrosion current density stayed below the target set of United States Department of Energy (1 μA·cm −2 ), without significant fluctuations. This demonstrates that the coating possesses outstanding chemical stability and long-term corrosion resistance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaobo Min,Chu Chu,Zonghao Luo,Junye Ma,Yifu Fu,Zongsu Wei,Richard Spinney,Dionysios D. Dionysiou,Ruiyang Xiao
In this study, the kinetics and mechanisms of superoxide radical ( O 2 · - )-mediated transformation of two monosubstituted aromatic contaminants with diametrically opposed electronic effect, namely phenol (PhOH) and nitrobenzene (NB), were investigated through combined experimental and theoretical approaches. The reaction rate constant between O 2 · - and PhOH was determined to be 269 M −1 s −1 via competition kinetic method. Such weak role of O 2 · - was confirmed by density functional theory (DFT) calculations at SMD/CAM-B3LYP/6-311++G(2d,2p)//CAM-B3LYP/6-31+G(d,p) level of theory. However, NB exhibited a higher reactivity towards O 2 · - than PhOH, demonstrating the selectivity of O 2 · - to electron withdrawing group. Despite the difference in reactivity, O 2 · - shows very limited removal capacity for PhOH and NB. These results were also in reasonably good agreement with an indication from a quantitative structure–property relationship model. With these quantitative and mechanistic results, we provided a more comprehensive understanding on the O 2 · - -mediated transformation of organic pollutants bearing different electron donating/withdrawing groups.
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高影响因子
Frontiers in Physics
·
2022
·
IF 3.718
Qi Bao-tao,Guo Jun-Jie,Miao Ying-qing,Zhong Mian-zeng,Li Bo,Luo Zi-yan,Wang Xi-guang,Nie Yao-zhuang,Xia Qing-lin,Guo Guang-hua
The emergence of two-dimensional (2D) van der Waals magnetic materials has attracted enormous attention due to their novel physical phenomena and potential application in the fields of spintronics and information storage technology. Here, we systematically study the magnetic and transport properties of a van der Waals antiferromagnetic material, FeNbTe2. The magnetic and magnetoresistance measurements verified its antiferromagnetic properties, spin glass state, and negative magnetoresistance effect at lower temperatures. In addition, the measurement results of transport also show the existence of angle-dependent anisotropic magnetoresistance in a wide temperature range and anisotropic magnetoresistance inversion in a certain temperature range.
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高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 44
·4485-4494
·
IF 3.532
Haotian Wu,Guangfa Wang,Zhenzhen Cai,Dezhong Li,Fangfang Xiao,Da Lei,Zhuohua Dai,Xincun Dou
The detection and discrimination of 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenol (TNP) from analogues are of great importance to global security and are full of challenges in the field of trace sensing. Here, benefitting from the strong electrophilicity of TNT, a sensing strategy is established by synthesizing polyethyleneimine capped copper nanoclusters (PEI-Cu NCs) with abundant –NH2 groups. By carefully controlling the size and structure of PEI-Cu NCs, Förster resonance energy transfer (FRET) from PEI-Cu NCs to the Meisenheimer complex occurs resulting from their spectral overlap when detecting TNT, while, due to the energy level match of TNP with PEI-Cu NCs, as well as the strong affinity between its –OH and –NH2 in PEI-Cu NCs, photo-induced electron transfer (PET) is feasibly expected. As a result, TNT and TNP could be detected from 26 types of analogues and cations with a limit of detection (LOD) of 26.57 and 12.82 nM, respectively. Besides, owing to the brown color of the Meisenheimer complex, the discrimination of TNT and TNP could be additionally realized by colorimetric detection. We expect that the proposed methodology would not only shine light on the detection and discrimination of TNT and TNP that mitigate against public security concerns, but also pave a way for the deep understanding of FRET and PET related fluorescence quenching mechanisms from the aspect of controllable sensing material design and synthesis.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）