ELECTROCHIMICA ACTA
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2026
·
IF 5.8
Xiangzhong Kong,Yong Yang,Siyuan Xu,Shi Li,Xi Chen,Lihua Wang,Zhongmin Wan
Phen strongly coordinates dissociative Fe ions to form active Fe-N X sites. • The strong coupling of Fe-F strengthens the poisoning resistance of the catalyst. • N,F co-doped network enhances ORR by lowering reaction energy barrier at Fe-N X sites. • Porous chain-bead framework prevents agglomeration, providing abundant sites and fast charge transfer. • AEMFCs with FeN X @Fe-F-CNF cathodes achieve a peak power density of 0.7 W cm −2 . Transition-metal-nitrogen-carbon (M-N-C) catalysts have garnered significant recognition as highly active non-precious metal catalysts for the oxygen reduction reaction (ORR) in anion exchange membrane fuel cells (AEMFCs), attributable to their low-cost, high atom-utilization and remarkable ORR performance. However, the primary drawback of conventional M-N-C catalysts lies in the suboptimal electronic structure of their metal centers (M-N 4 ), which results in excessively strong adsorption energy toward oxygen intermediates, thereby limiting their intrinsic activity and stability. Herein, the FeF 2 /Fe 3 N nanocrystalline decorated N, F co-doped chain-bead Fe-N-C fiber network (FeN X @Fe-F-CNF) has been fabricated by electrospinning strategy through utilizing 1,10-Phenanthroline monohydrochloride monohydrate (Phen) and NH 4 F as nitrogen/fluoride sources respectively. The six-membered heterocyclic in Phen allows for strong coordination with dissociative Fe ions, thus, promoting the formation of Fe-N X sites. Furthermore, co-doped N, F is able to tune the electronic structure of Fe active sites, whereas flexible chain-bead nanofibers guarantee considerable structural adaptation, thereby contributing to the enhancement of their catalytic activity and stability. The obtained FeN X @Fe-F-CNF exhibits enhanced ORR catalytic activity (with an E 1/2 of 0.863 V) and superior durability (with a current retention of 90.7 % after maintaining the ORR typical potential range for 100,000 seconds and a E 1/2 negative shift of 7 mV after 5000 continuous potential cycles). Furthermore, the assembled AEMFCs based on FeN X @Fe-F-CNF catalysts demonstrate excellent performance, with a peak power density of 0.7 W cm −2 , indicating its potential feasibility for commercial applications. Download: Download high-res image (293KB) Download: Download full-size image
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高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Weidong Li,Qiuyi Chen,Dongyun Zhang,Chen Fang,Song Nian,Wenxu Wang,Cong Xu,Chengkang Chang
Aiming for promoting the capacity and cycling stability of O3-type NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM), the cathode material of sodium ion batteries (SIBs) with the most potential for industrialization, Na(Ni 1/3 Fe 1/3 Mn 1/3 ) 0.99 Mo 0.01 O 1.99 F 0.01 (NFM-MoF), Na(Ni 1/3 Fe 1/3 Mn 1/3 ) 0.99 Mo 0.01 O 2 (NFM-Mo) and NaNi 1/3 Fe 1/3 Mn 1/3 O 1.99 F 0.01 (NFM-F) were successfully synthesized by solid phase method. The electrochemical performance of the doped samples was compared with that of the pristine NFM. The mechanism of the single- or dual-doping was explored by XRD Rietveld refinement and XPS. The NFM-MoF exhibits the highest initial specific discharge capacity of 137mAhg −1 at 1 C with a retention of 91.97% after 100 cycles and the smallest polarization (0.32 V), which could be contributed to the highest Ni 2+ content and highest D Na + (7.335 ×10 −13 cm 2 ·s −1 ) caused by the synergistic effect of Mo and F dual-doping. The highest Fe 3+ content in the NFM-Mo leads to the higher initial discharge capacity of 1 36 mAhg −1 at 1 C with a relative lower retention of 83.38%, which is due to the structure instability resulting from Fe migration and the lowest Mn content, than that of the NFM-F (85.31%). It illustrates that the Mn 4+ plays a crucial role in stabilizing the structure during Na + migrating. The superiority of the discharge capacity of the NFM-Mo become narrow with rates rise, due to its lower D Na + (4.229 ×10 −13 cm 2 ·s −1 ) than that of the NFM-F D Na + (5.681 ×10 −13 cm 2 ·s −1 ). It verifies that it is a diffusion control process at high rates. Mo and F dual-doping in NFM was proved to amplify the benefit of Ni 2+ increasing, meanwhile restrain undesirable Fe increasing due to the synergistic effect.
研究领域:
材料科学
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电化学
·
储能技术
·
无机化学
·
固体物理
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高影响因子
Catalysts
·
2024
·Vol. 14
·期 10
·735
·
IF 3.8
Lu Qiu,Hanliang Li,Wenyi Xu,Rongshu Zhu,Feng Ouyang
The organic pollutants discharged from industrial wastewater have caused serious harm to human health. The efficient photocatalytic degradation of organic pollutants under sunlight shows promise for industrial applications and energy utilization. In this study, a modified TiO2photocatalyst doped with bismuth (Bi) and fluorine (F) and composited with SnO2and SiO2was prepared, and its performance for the degradation of Rhodamine B (RhB) under simulated sunlight was evaluated. Through the optimization of the doping levels of Bi and F, as well as the ratio of SnO2and SiO2to TiO2, the optimal catalyst reached degradation efficiency of 100% for RhB within 20 min under simulated sunlight, with a first-order reaction rate constant of 0.291 min−1. This value was 15, 41, 6.5, and 3.3 times higher than those of TiO2/SnO2, Bi/TiO2, Bi-TiO2/SnO2, and F/Bi-TiO2/SnO2, respectively. The active species detection showed that h+was the most crucial active species in the process. The role of Bi and F addition and SnO2-SiO2compositing was investigated by characterization. Bi formed a chemical bonding with TiO2by doping into TiO2. The absorbance intensity in the UV and visible light regions was improved by SnO2and F modification. Composite with SiO2led to a larger surface area that allowed for more RhB adsorption sites. These beneficial modifications greatly enhanced the photocatalytic activity of the catalyst.
研究领域:
环境科学
·
材料科学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2026
·
IF 4.8
Hao Xue,Tianyi Ma,Hong Zheng,Luoyilan Zhang,Ke Cheng
Biomass-derived fluorine and nitrogen co-doped carbon dots (F, N-CDs) were synthesized via a one-step hydrothermal method using Rhododendron simsii flowers as the precursor. The prepared F, N-CDs exhibited favorable optical properties, good water solubility, and a pronounced enhancement effect on the chemiluminescence (CL) of the Luminol-K 2 S 2 O 8 -NaOH system. The optical characteristics were systematically investigated by UV–Vis absorption spectroscopy, fluorescence spectroscopy, and fluorescence lifetime analysis. The possible CL enhancement mechanism was further investigated through reactive oxygen species scavenging experiments and singlet oxygen probe experiments. On this basis, an enhanced flow-injection chemiluminescence (FI-CL) method was developed for the determination of levetiracetam (LEV). Under the optimized conditions, the relative CL intensity exhibited a satisfactory linear relationship with LEV concentration over the range of 0.10–10.00 mM, with a limit of detection (LOD) of 2.02 × 10 −3 mM and a limit of quantification (LOQ) of 6.71 × 10 −3 mM. The proposed method was successfully applied to the commercial LEV pharmaceutical formulations, giving recoveries of 94.8–103.1% and relative standard deviations (RSDs) below 4.68%. These results demonstrate the potential of biomass-derived carbon dots for spectroscopic and characterization and chemiluminescence-based analytical applications.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Shengrui Cui,Chengliang Lin,Fangfang Dong,Mingxu Duan,Mengqiu Li,Abdul Majid,Ayaulym Belgibayeva,Yongcheng Jin
As a promising high-voltage cathode material candidate for next-generation high-energy-density lithium-ion batteries (LIBs), spinel-type LiNi0.5Mn1.5O4 (LNMO) has attracted significant attention due to its high operating voltage (~4.7 V). However, its intrinsic structural instability and severe surfacial side reactions lead to poor cycling stability and rate capability. This study presents an innovative low-temperature calcination strategy to synthesize Ti/F co-doped LNMO (LNMO-TiF3-x) cathode materials, utilizing TiF3 as a dual-functional dopant. Both experimental and theoretical investigations demonstrate that the introduced Ti3+/Ti4+ redox couple activates additional Mn-based capacity within the 4.2 V region, while contributing a minor yet measurable reversible capacity. Simultaneously, Ti/F co-doping strengthens the lattice through covalent bonding, effectively suppressing transition metal dissolution and synergistically enhancing cycling stability. Furthermore, Ti4+ doping expands the (111) lattice spacing, which facilitates Li+ diffusion kinetics and significantly enhances rate capabilities. The optimized LNMO-TiF3-4 exhibits outstanding performance, delivering 131.9 mAh g-1 at 10 C and maintaining 72.4% capacity retention after 1000 cycles at 5 C. This work not only demonstrates the high electrochemical performance of LNMO-TiF3-x but also offers new insights into bulk-interface synergistic engineering for advanced high-voltage cathode materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lingzhi Guo,Hongyan He,Yurong Ren,Chao Wang,Mingqi Li
Core-shell F-doped carbon coated SiO composites with interspaces and some small voids (SiO@F-doped C) are successfully fabricated using bulk SiO as starting material. With the assistance of polytetrafluoroethylene (PTFE), both etching and carbon coating of SiO are firstly performed in a single step, which largely lowers the production cost of materials. The SiO@F-doped C composite obtained by annealing the mixture of SiO and PTFE with a mass ratio of 5:3 at 650 °C shows the highest stable discharge capacity with excellent cycling stability. It delivers a stable discharge capacity of about 975 mAh g −1 at a current density of 100 mA g −1 . Even after the current density increases to 1600 mA g −1 , a stable discharge capacity of about 553 mAh g −1 can be achieved. At a current density of 400 mA g −1 , the composite maintains a discharge capacity of 752 mAh g −1 after 350 cycles, the retention of which is 99.2% versus that in the second cycle. Compared with the annealed SiO, in addition to higher conductivity, the ions diffusion rate of the SiO@F-doped C composite increases 2.94 times while the volume expansion falls by more than half, which should be responsible for its significantly enhanced electrochemical performance.
研究领域:
材料科学
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电化学
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纳米科技
·
能源存储
·
功能材料
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高影响因子
Science Advances
·
2022
·Vol. 8
·期 50
·
IF 14.957
Qingxun Guo,Liang Wang,Longbo Yang,Jiashun Duan,Hainan Du,Guoqi Ji,Nian Liu,Xue Zhao,Chao Chen,Ling Xu,Liang Gao,Jiajun Luo,Jiang Tang
Next-generation wide color gamut displays require the development of efficient and toxic-free light-emitting materials meeting the crucial Rec. 2020 standard. With the rapid progress of green and red perovskite light-emitting diodes (PeLEDs), blue PeLEDs remain a central challenge because of the undesirable color coordinates and poor spectra stability. Here, we report Cs 3 CeBr x I 6− x ( x = 0 to 6) with the cryolite-like structure and stable and tunable color coordinates from (0.17, 0.02) to (0.15, 0.04). Further encouraged by the short exciton lifetime (26.1 ns) and high photoluminescence quantum yield (~76%), we construct Cs 3 CeBr x I 6− x -based rare-earth LEDs via thermal evaporation. A seed layer strategy is conducted to improve the device’s performance. The optimal Cs 3 CeI 6 device achieves a maximum external quantum efficiency of 3.5% and a luminance of 470 cd m −2 with stable deep-blue color coordinates of (0.15, 0.04). Our work opens another avenue to achieving efficient and spectrally stable deep-blue LEDs.
研究领域:
材料科学
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光电子学
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固态照明
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无机化学
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显示技术
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3381-3393
·
IF 3.5
Zhang Feng,Wang Hao
Exorbitant cost and limited availability of platinum-based electrocatalysts for the oxygen reduction reaction (ORR) in metal–air batteries and alkaline fuel cells pose significant obstacles to the large-scale commercialization of these clean-energy technologies. Herein, we employed a cost-effective and sustainable bacterial cellulose biomass as the precursor to prepare a nitrogen and fluorine codoped metal-free ORR electrocatalyst (BCC-NF-900) by direct pyrolysis regulation. The BCC-NF-900 inherited the three-dimensional framework of bacterial cellulose, exhibiting a robust porous structure with a Brunauer–Emmett–Teller surface area of 196.9 m 2 ·g −1 . The pyridinic N (0.6 at%) and semi-ionic F (0.34 at%) species formed in the inert sp2 carbon skeletons synergistically regulated the electron spin and charge density of the adjacent C atoms. Such rational combination of a rapid transport pathway and effective active site led to high ORR activity (onset potential 0.89 V vs. RHE), methanol resistance, and electrochemical stability (merely 6.9% current loss) in alkaline electrolyte. Importantly, compared to the mere F-doped BCC-F-900 (onset potential 0.82 V vs. RHE) and N-doped BCC-N-900 (onset potential 0.77 V vs. RHE) catalysts, the BCC-NF-900 catalyst exhibited a markedly enhanced ORR performance, as evidenced by the measured onset potential. This study provides an available reference for the design of efficient metal-free catalysts for ORR, presenting a promising alternative to Pt/C catalysts in metal–air batteries and alkaline fuel cells.
研究领域:
材料科学
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电化学
·
能源技术
·
纳米技术
·
环境科学
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高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 7
·期 2
·398-408
·
IF 6.813
Zhi Zou,Shuo Meng,Xiaolei Bian,Longcheng Liu
The generation of electricity from salinity difference energy between seawater and freshwater through a Capacitive Mixing (CapMix) system with solid electrodes was limited by intermittent energy production. In this study, a single-cell CapMix system using flow-electrode (F-CapMix) with a cross-chamber configuration was examined to produce electricity continuously from simulated seawater and freshwater. The effects of the flow-electrode electrolyte concentration, activated carbon loading, amounts of carbon black, and connected external resistance on the system performance were investigated. The results suggest that the system performance can be enhanced by increasing the activated carbon loading and carbon black amounts. Furthermore, to achieve the maximum power density of the system, the external resistance should be matched to the internal resistance. The maximum power density of the presented single-cell F-CapMix system was 74.3 mW m−2, which was comparable to those of previous CapMix and F-CapMix systems. In addition, this study also reveals that using only carbon black as the flow electrode is capable of producing electricity continuously for long-term operation. In summary, these results indicate the potential of F-CapMix and provide developing directions for further optimization.
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产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Chen Li,Yan Xiong,Lei Zhao,Haiqin Wan,Jun Li,Shenwen Fang,Meng Wang,Ming Duan,Jintian Ren,Yi Xiao
Experiment evaluation and mechanism analysis of separation performance are crucial for oily wastewater treatment. In this work, a fluorinated superhydrophobic/superoleophilic (F-SHPB/SOPL) surface was fabricated on a steel mesh substrate by double depositions of SiO2–TiO2 nanoparticles for high-roughness improvement and composite modification of fluorine-alkyl groups for low-energy achievement. Measurements of SEM, XPS, FTIR, laser scanning confocal microscope (LSCM), and excitation–emission matrix (EEM) were carried out for surface property characterization. The oil–water separation performances at the prepared F-SHPB/SOPL surface were investigated from experimental and simulation aspects. Separation tests, flux tests, and anti-contamination tests were performed by experimental methods. The results indicated that the surface showed excellent separation efficiencies (>99.2%) for oil–water mixture and oil-in-water emulsion, high permeate flux (>3000 L·m–2·h–1) for organic oils, and perfect anti-pollution/self-cleaning capacity for liquid and solid contaminations. The interaction energies and interaction distances were measured by ab initio molecular dynamics simulation (AIMD) simulations. With lower interaction energy (Eoil = −456.52∼−1044.22 eV) than that of water molecules (Ewater = −172.73 eV) and shorter distance (Doil = 4.42∼5.13 Å) than that of water molecules (Dwater = 11.49 Å), oil molecules showed higher interaction stability than water molecules on the F-SHPB/SOPL surface. The calculation revealed the essence of the oil–water separation phenomenon. This work not only proposes the fabrication methodology of the SHPB/SOPL material but also elucidates the intermolecular interaction for oil–water separation. The results can provide a fundamental basis for separation operation and removal treatment in industrial and domestic applications.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
·
2023
·
IF 5.4
Lili Song,Jiayi Wang,Jiaxuan Nie,Yue Zhang,Rui Han,Huimin Liu,Ningning Ma,Zhen Yang,Yubo Li
Ethnopharmacological relevance Tripterygium wilfordii Hook. f (TwHF) has been used as a traditional Chinese medicine for the treatment of rheumatoid arthritis and nephritis for hundreds of years. Aim of the study Although the efficacy of TwHF in the treatment of RA is definite, its serious side effects and toxicity have also received close attention from domestic and international researchers, so the clinical application of TwHF has been controversial. Most of the current TwHF toxicity studies have been conducted with animals in normal body states, but ignore the effects in pathological states. In this study, we aimed to find out the material basis and metabolic mechanism of the “toxicity/effectiveness” of TwHF on rat kidneys in different body states by using two-way orthogonal partial least squares (O2PLS) method. Materials and methods In the present study, TwHF was extracted by reflux extraction method using ethanol as the extraction solvent. Firstly, the effects of TwHF on rat kidneys in different body states were first evaluated by detecting creatinine and urea nitrogen levels and morphological changes in kidney pathology identified the components of TwHF in rats in different body states using UPLC-Q-TOF/MS technique. Serum and urine metabolomics were used to search for biomarkers and metabolic pathways by which TwHF exerts renal injury and protection, and finally, O2PLS correlation analysis was used to correlate the components with renal protective and injury biomarkers. Results TwHF was found to have a protective effect on the kidney of RA rats and an injurious effect on the kidney of normal rats at a dose of 11.25 g/kg/d. The UPLC-Q-TOF/MS technique was used to identify 34 components in TwHF extracts; 23 components and 57 metabolites were identified in the administered rats. O2PLS screened three substances as both toxic and pharmacodynamic components of TwHF, namely 3,5-dimethoxyphenyl-2-propenl-ol, kaurane-16,19,20-triol, and demethylzeylasteral + O, and found that these three components may exert nephrotoxic effects via the nicotinic acid and nicotinamide metabolic pathways and nephroprotective effects via the tryptophan metabolic pathway. Conclusion In this study, O2PLS analysis was used for the first time to combine biomarkers and components in vivo and found the material basis and metabolic mechanism of nephrotoxicity and efficacy of TwHF, which provided key clues for further study on the biological mechanism of toxicity and efficacy of TwHF.
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产品关联
DOI
PubMed
高影响因子
Oncology Letters
·
2022
·Vol. 24
·期 5
·1-12
·
IF 3.111
Haoran Jiang,Xianxin Wen,Xue Zhang,Bingyu Zhang
Concanavalin A (Con A), the first and most typical representative of the legume lectin family, has a potent anti‑liver cancer effect by inducing cell apoptosis and autophagy. However, its function in human liver cancer cell migration remains unclear. The present study investigated the effect of Con A on the viability and migration of human liver cancer cells with different metastatic abilities. It was found that Con A could reduce the viability of human liver cancer cells (HCCLM3, MHCC97L and HepG2) and human hepatocytes (MIHA). In addition, Con A could inhibit human liver cancer cell migration specifically without affecting hepatocytes. Sugar inhibition assay showed that glucose‑related sugar binding sites played an important role in the inhibition of Con A on human liver cancer cell migration. In addition, Con A could affect HCCLM3 migration by activating ERK1/2, JNK1/2/3 and p38 signaling in the MAPK pathway. Moreover, Con A could regulate fibrous actin (F‑actin) redistribution and assembly via the MAPK signaling pathway. However, Con A had no significant effect on the activation of matrix metalloproteinase (MMP)‑2 and MMP‑9 in HCCLM3 cells. In conclusion, Con A may bind to glucose‑related receptor protein, activating ERK1/2, JNK1/2/3 and p38 signaling in the MAPK pathway, further contracting cells and reducing the content of F‑actin of single cells to inhibit HCCLM3 cell migration. These results would deepen the links between human liver cancer cell migration and related glycoproteins or signaling molecules, and may provide a new perspective for Con A as a potential anticancer agent.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）