Batteries-Basel
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2024
·Vol. 10
·期 8
·272
·
IF 4.6
Mingfeng Tan,Helei Wei,Qi Li,Zhipeng Yu,Qiang Zhang,Mingzhi Lin,Bo Lin
A novel composite consisting of fluorine-doped carbon and graphene double-coated LiMn0.6Fe0.4PO4(LMFP) nanorods was synthesized via a facile low-temperature solvothermal method that employs a hybrid glucose and polyvinylidene fluoride as carbon and fluorine sources. As revealed by physicochemical characterization, F-doped carbon coating and graphene form a ‘point-to-surface’ conductive network, facilitating rapid electron transport and mitigating electrochemical polarization. Furthermore, the uniform thickness of the F-doped carbon coating alters the growth of nanoparticles and prevents direct contact between the material and the electrolyte, thereby enhancing structural stability. The strongly electronegative F−can inhibit the structural changes in LMFP during charge/discharge, thus reducing the Jahn–Teller effect of Mn3+. The distinctive architecture of the LMFP/C-F/G cathode material exhibits excellent electrochemical properties, exhibiting an initial discharge capacity of 163.1 mAh g−1at 0.1 C and a constant Coulombic efficiency of 99.7% over 100 cycles. Notably, the LMFP/C-F/G cathode material achieves an impressive energy density of 607.6 Wh kg−1, surpassing that of commercial counterparts. Moreover, it delivers a reversible capacity of 90.3 mAh g−1at a high current rate of 5 C. The high-capacity capability and energy density of the prepared materials give them great potential for use in next-generation lithium-ion batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 19
·2859-2868
·
IF 8.683
Ming Liu,Ran Cen,Ji-Hong Lu,Tie-Hong Meng,Chun-Rong Li,Carl Redshaw,Timothy J. Prior,Zhu Tao,Xin Xiao
Fluorescent nitrogen and fluorine doped carbon dots (CDs) were prepared by a hydrothermal method using levofloxacin (LVFX) and cucurbit[6]uril (Q[6]) as the nitrogen and carbon sources, respectively. Decomposition of LVFX occurred at elevated temperature affording N,N′-desethylene levofloxacin hydrochloride (N,N′-DLH). The crystal structure of the resulting inclusion complex N,N′-DLH@Q[6]·[CdCl4]2(H3O)·9H2O was determined, where N,N′-DLH is protonated on each of the terminal nitrogens and the quinone functionality is a quinol which forms an intramolecular hydrogen bond to the carboxylic acid. The synthesized N,N′-DLH containing Q[6]-CDs emitted intense blue fluorescence with high photostability and exhibited stability at high ionic strength. In particular, the original rigid macrocyclic skeletons of these hosts were retained during the fabrication process, which helps in uniquely distinguishing them from other reported CDs. Meanwhile, the performance of the Q[6]-CDs was characterized using fluorescence and NMR spectroscopies. Subsequently, using the obtained Q[6]-CDs, an efficient sensing method for L-tryptophan (L-Trp) and capecitabine (CAP) has been developed based on macrocyclic host–guest chemistry. Under applicable conditions, the detection limits for L-Trp and CAP were calculated to be 5.13 × 10−8 M and 1.48 × 10−8 M, respectively.
研究领域:
分析化学
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材料科学
·
药物化学
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产品关联
DOI
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
Y. Li,S. Xiao,X. Li,C. Chang,M. Xie,J. Xu,Z. Yang
Electro-synthesis of ammonia at ambient environment is a promising alternative of the industrial Haber-Bosch process operated under critical conditions. In this work, we have systematically investigated the electro-reduction of nitrate (NO 3 − RR) to ammonia catalyzed by fluorine doped carbon (FC) synthesized from the pyrolysis of the discarded cigarette filter saturated with polytetrafluoroethylene (PTFE) solution. FC electrocatalyst shows an exceptional NO 3 − RR catalytic performance with Faradaic efficiency of 20% associated with ammonia production rate of 23.8 mmol h −1 g cat −1 , 2 and 4-fold better than bare C electrocatalyst. Furthermore, a stable NO 3 − RR activity is also achieved for FC electrocatalyst. Density functional theory (DFT) results suggest that F dopants efficiently reduce the energy barriers of NO 3 − hydrogenation and suppress the competitive hydrogen evolution reaction (HER). This observation will be beneficial for constructing a high-performance metal-free electrocatalyst to electro-synthesize ammonia from NO 3 − RR.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hong Chen,Yuchen Wu,Hanyu Xu,Jiaqing Zhao,Ji Wang,Chaojie Ren,Chao Zhao,Ruizhi Yang
The limited electron and ionic conductivity, along with the sluggish kinetics caused by the Jahn-Teller effect of Mn 3+ , impose constraints on the electrochemical performance of LiFe x Mn 1-x PO 4 . Herein, the surface of LiFe 0.5 Mn 0.5 PO 4 (LFMP) is modified with a F-doped carbon using the solvothermal and calcination methods. The incorporation of F-doped carbon coating, along with the formation of interfacial F-Li, F-Fe and F-Mn bonds between the carbon layer and LFMP nanoparticles, significantly mitigates charge transfer resistance, facilitates rapid electron transfer, as well as enhances Li + diffusion kinetics. The LFMP@C-F2 cathode prepared in this study exhibits an unexceptionable capacity retention of 90.5 % after 300 cycles at a low rate of 0.2C and a capacity retention of 78.8 % over 1000 cycles at a high rate of 1C. When incorporated into the solid battery configuration (Li/PEO-LATP CSE/LFMP@C-F2), it exhibits an initial discharge specific capacity of 148 mAh g −1 and maintains a capacity retention of 85.8 % after 60 cycles at 0.1C, thereby offering an innovative approach to enhance the performance of LFMP in terms of cycling stability and rate capacity in lithium-ion batteries, as well as to apply LFMP into solid-state lithium batteries.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Shaoxiong Liu,Jing Dai,Xuexue Li,Jianjun Xia,Mingyang Xie,Zhifeng Huang,Li Liu
Mn 0.5 Ti 2 (PO 4 ) 3 with a NASICON structural is used as an anode material in potassium-ion batteries due to its abundance of vacancies that can hold potassium ions . This characteristic not only contributes to its excellent stability but also results in a high specific capacity. However, the poor electrical conductivity of the polyanionic type structure limits the material's ability to fully utilize its capacity. In this paper, the conductivity and electrochemical stability of the Mn 0.5 Ti 2 (PO 4 ) 3 anode material are enhanced through composite formation with an F-doped carbon layer. The introduction of F into the carbon matrix creates a large number of vacancy defects and F active sites. The vacancies enhance the transport of potassium ions on the Mn 0.5 Ti 2 (PO 4 ) 3 material's surface, while the active sites exhibit strong electronegativity , improving the absorption of potassium ions. Therefore, the diffusion impedance of potassium ions is significantly reduced, leading to an increased diffusion rate of potassium ions. Attributing to the improved reaction kinetics, the Mn 0.5 Ti 2 (PO 4 ) 3 @F-doped carbon composite demonstrates a high specific capacity of 86 mA h g −1 at 10,000 mA g −1 when used as the anode for potassium-ion batteries. Even more, the specific capacity remains a capacity of 136 mA g −1 after 3000 cycles at 1000 mA h g −1 . This study enhances our comprehension of material design by investigating the alteration of carbon matrix to promote the electrochemical characteristics of materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Yiqian Huang,Xiaosong Huang,Huashan Lin,Zhikun Liu,Yi Zong
Carbon quantum dots (CQDs) with semiconductor-like properties have received considerable attention because of their unique photoelectric properties and electron transfer ability. However, the preparation of highly crystalline CQDs with strong fluorescence (FL) emission by the room temperature (RT) synthesis is a challenging task. Herein, we develop a highly-efficient RT synthesis strategy based on the Schiff base condensation reaction for preparing the fluorine-doped CQDs (F-CQDs) with good crystallinity . The as-prepared F-CQDs show strong blue FL emission with a high quantum yield of 39%, which is the highest values yet recorded for carbon dots prepared by RT synthesis. Moreover, the F-CQDs can be used for sensitive tetracycline sensing based on inner filter effect . The FL intensity ratio ( F 0 / F ) of the F-CQDs is proportional to the concentration of tetracycline in the range of 0.1–25 μM with the limit of detection of 85 nM. This sensitive assay has a good application prospect for tetracycline detection in the complex matrixes because of its simplicity and sensitivity.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2016
·
IF 6.198
Nan Wang,Hai Fan,Jianchao Sun,Zhenwei Han,Jing Dong,Shiyun Ai
Fluorine-doped carbon nitride (F C 3 N 4 ) quantum dots were successfully synthesized on a large scale by a facile ethylene glycol-assisted ultrasonic method using bulk F C 3 N 4 powder as the precursor and ethylene glycol as the solvent. Characterization results show that high-quality F C 3 N 4 quantum dots with a uniform size of 1.5–2.0 nm were successfully prepared in ethylene glycol. Ethylene glycol is found to play an important role in the synthesis of quantum dots. Doping of fluorine in C 3 N 4 could adjust the band gap structure of C 3 N 4 , resulting in altering the emission peak position and increasing the fluorescent intensity. The as-prepared F C 3 N 4 quantum dots in ethylene glycol show much higher fluorescent intensity with the quantum yield of 39.03%. The prepared F C 3 N 4 quantum dots were successfully applied as a fluorescent probe for bacterial imaging.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Xiaofang Tian,Meijie Xie,Xinyu Luo,Boyan Zheng,Yongxia Ao,Jiaxin Liu,Mei Wang,Qianchun Zhang,Yun Wu
The detection of food pigments is essential for ensuring food quality and safety. This study presents the efficient preparation of fluorine-doped carbon quantum dots (F-CQDs) through a simple solvothermal reaction using Zanthoxylum and NH 4 F as precursors. The resulting F-CQDs displayed optimal fluorescence characteristics, along with a quantum yield of 4.81 %. Notably, the as-prepared F-CQDs exhibited excellent photostability and were effectively quenched by amaranth, demonstrating their potential as reliable probes for amaranth detection. The probe showed a strong linear response ( R 2 = 0.9992) to amaranth concentrations of 0.15–75 μM, yielding a limit of detection as low as 50 nM. Validation tests across various food matrices, including bayberry, a sugar-sweetened beverage, and candies, yielded good recovery rates of 89.0 %–119 % and a relative standard deviation of less than 4.9 % ( n = 5), indicating high reliability. These findings suggest that F-CQDs are viable candidates for detecting amaranth in foods, which can help enhance food safety and quality control.
研究领域:
食品科学
·
分析化学
·
纳米技术
·
荧光光谱学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-11
·
IF 5.3
Chen Chao,Zhang Yihao,Gao Sineng,Wang Linfan,Zhang Ting,Li Tingting,Qian Xiaoqing,Chen Da
Fluorine-doped carbon dots (F-CDs) are prepared through a one-pot hydrothermal method starting from ciprofloxacin, exhibiting a bright blue emission at 453 nm under the optical wavelength of 358 nm. The sensitive sensor for detecting Cu 2+ is established based on the fluorescence quenching of F-CDs, which is attributed to the static quenching caused by the formation of non-luminescent complexes between them. The limit of detection (LOD) is 46.2 nM. Meanwhile, a portable fluorescence sensor based on a lateral flow test strip (LFTS) has been developed for practical applications, which allows real-time monitoring of Cu 2+ with a satisfactory limit of detection (LOD) of 69.7 nM in a good linear range of 0.0697–50 μM. In addition, the identification of latent fingerprints (LFPs) based on F-CDs has been developed with the assistance of MATLAB, realizing high-performance fingerprint visualization and recognition. The results serve to underscore that the synthesized F-CDs not only provide a new tool for Cu 2+ detection in real samples, but also show great potential for LFPs visualization and information identification. Graphical abstract
研究领域:
分析化学
·
材料科学
·
法医学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xin-He Duan,Hong-Wei Li,Yi Li,Zhijiu Huang,Sha Liu,Yuqing Wu
Acetaldehyde (AH) is defined as a carcinogen, the widely existence in alcoholic beverages has led its determination an essential aspect related to human health. Fluorine doped carbon dots (dF-CDs) is developed, which process light-activated oxidase-mimic property and high stability at acidic condition. Under the UV irradiation, dF-CDs generate reactive oxygen species (ROS) to oxidize o -phenylenediamine (OPD) into 2,3-diaminophenazine (DAP), showing absorption peak at 450 nm and strong emission at 577 nm, meanwhile, the produced DAP quenches the original emission of dF-CDs at 455 nm via an inner filter effect (IFE). However, the introduction of AH inhibits such processes efficiently, thereby establishing a colorimetry and ratiometric fluorescence method for AH determination. Of note, this dual-responsive method has been used for the accurate AH determination in Chinese Baijiu . Therefore, the developed method not only provide a dual-sensing platform to determine AH, but also extends the applications of CDs in food analysis.
研究领域:
分析化学
·
食品安全
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Jing Wang,Shuo Chen,Xie Quan,Hongtao Yu
Metal-free carbon materials have been presented to be potential alternatives to metal-based catalysts for heterogeneous catalytic ozonation , yet the catalytic performance still needs to be enhanced. Doping carbon with non-metallic heteroatoms (e.g., N, B, and F) could alter the electronic structure and electrochemical properties of original carbon materials, has been considered to be an effective method for improving the catalytic activity of carbon materials. Herein, fluorine-doped carbon nanotubes (F-CNTs) were synthesized via a facile method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy . The as-synthesized F-CNTs exhibited notably enhanced catalytic activity towards catalytic ozonation for the degradation of organic pollutants. The oxalic acid removal efficiency of optimized F-CNTs was approximately two times as much as that of pristine CNTs, and even exceeded those of four conventional metal-based catalysts (ZnO, Al 2 O 3 , Fe 2 O 3 , and MnO 2 ). The XPS and Raman studies confirmed that the covalent C F bonds were formed at the sp 3 C sites instead of sp 2 C sites on CNTs, not only resulting in high positive charge density of C atoms adjacent to F atoms, but remaining the delocalized π-system with intact carbon structure of F-CNTs, which then favored the conversion of ozone molecules (O 3 ) into reactive oxygen species (ROS) and contributed to the high oxalic acid removal efficiency. Furthermore, electron spin resonance (ESR) studies revealed that superoxide radicals (O 2 − ) and singlet oxygen ( 1 O 2 ) might be the dominant ROS that responsible for the degradation of oxalic acid in these catalytic systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Analytical Methods in Chemistry
·
2023
·
IF 2.6
Qianchun Zhang,Haijiang Du,Siqi Xie,Fengling Tian,Xixi Long,Shan Liu,Yun Wu
Hypochlorite (ClO−) has received extensive attention owing to its significant roles in the immune defense and pathogenesis of numerous diseases. However, excessive or misplaced production of ClO− may pose certain diseases. Thus, to determine its biological functions in depth, ClO− should be tested in biosystems. In this study, a facile, one-pot synthesis of nitrogen-fluorine-doped carbon quantum dots (N, F-CDs) was developed using ammonium citrate tribasic, L-alanine, and ammonium fluoride as raw materials under hydrothermal conditions. The prepared N, F-CDs demonstrate not only strong blue fluorescence emission with a high fluorescence quantum yield (26.3%) but also a small particle size of approximately 2.9 nm, as well as excellent water solubility and biocompatibility. Meanwhile, the as-prepared N, F-CDs exhibit good performance in the highly selective and sensitive detection of ClO−. Thus, a wide concentration response range of 0–600 μM with a low limit of detection (0.75 μM) was favorably obtained for the N, F-CDs. Based on the excellent fluorescence stability, excellent water solubility, and low cell toxicity, the practicality and viability of the fluorescent composites were also successfully verified via detecting ClO− in water samples and living RAW 264.7 cells. The proposed probe is expected to provide a new approach for detecting ClO− in other organelles.
研究领域:
分析化学
·
生物医学
·
环境科学
✓ 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）