JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siyu Chu,Min Sun,Zijiong Li,Haiyan Wang,Feng Miao
The carbon-based catalysts exhibit excellent electrocatalytic and stable performance toward oxygen reduction reaction (ORR), which are expected to replace expensive and scarce Pt-based catalysts. However, how to regulate the interaction between silver and carrier carbon dots (CD) to improve electrocatalytic performance toward oxygen reduction reaction (ORR) and stability, has not been systematically studied. In this study, we in-situ synthesized fluorine and nitrogen co-doped CD anchoring Ag nanoparticles by UV irradiation reduction method. The peak potential, onset-potential and half-wave potential of F, [email protected] are 0.85 V, 1.056 V, and 0.9 V, respectively, indicating outstanding ORR performance. The current density of F, [email protected] remains 97.5 % after 50, 000 s, showing more excellent stability than Pt/C. The impressive ORR catalytic activity and stability of F, [email protected] could be attributed to the strong anchoring effect of nitrogen-doped CD on Ag. This effect leads to a significant interaction and charge transfer between Ag and CD, thereby enhancing the charge transfer process during the catalytic reaction. This project aims to design a carbon dot/silver composite catalyst with high ORR catalytic performance and favorable stability. The implementation of this project provides good theoretical guidance for the design of carbon nanomaterial-based catalytic systems.
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Journal of Energy Storage
·
2025
·
IF 9.8
Shakeel Ahmad,Muhammad Tariq,Umar Farooq,Henmei Ni,Afaq Ullah Khan,Zainab M. Almarhoon,Abdulaziz A. Alanazi,Talal M. Althagafi,Kamran Tahir,Sameerah I. Al-Saeedi
The integration of Cobalt hydroxide fluoride Co( OH )F-based materials is expected to significantly enhance the electrochemical performance of supercapacitor electrodes. In this work, Co( OH )F with various morphologies was synthesized using a simple hydrothermal method and evaluated as an electrode material for supercapacitors. The porous nano square-like morphology exhibited excellent durability in electrochemical reactions, providing abundant active sites. Furthermore, the highly electronegative fluorine atom contributes to fast ion diffusion to electrode surface and reduces intrinsic resistance during the reaction, leading to remarkable electrochemical performance. Remarkably, the optimized Co( OH )F 450 exhibited an ultrahigh specific capacitance of 558 F g −1 at a current density of 1 A g −1 , which is greater than that of Co( OH )F 300 , and Co( OH )F 150 electrodes. Furthermore, the device delivered outstanding cyclic performance, maintaining 80 % capacitance retention after 10,000 charge-discharge cycles. Finally, the Co( OH )F 450 electrode demonstrates a promising energy density of 27 Wh kg −1 at a power density of 2571 W kg −1 . Above results suggest that Co( OH )F 450 electrode could pave way for the development of high-performance electrodes in the field of energy storage.
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Forests
·
2024
·Vol. 15
·期 2
·236
·
IF 2.4
Liping Yu,Wang Cheng,Meifen Tian,Zhigang Wu,Xiaoli Wei,Xing Cheng,Mingwei Yang,Xuan Ma
The medicinal value ofP. zhennanhas been documented in traditional Chinese medicine books. The aim of this paper was to study the antioxidant activity of alcoholic extracts ofP. zhennanleavesusing 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2-phenyl-4,4,5,5-tetramethylimidazolineoxyl-1-oxyl-3-oxide (PTIO) radical scavenging and ferric ion reducing antioxidant power (FRAP) assays. The active components of the leaves were identified via headspace solid-phase microextraction and gas chromatography–mass spectrometry (HS-SPME-GC-MS). The results showed that the scavenging rate of DPPH was 94.67%with an EC50 value of 0.674 mg/mL at a concentration of 2 mg/mL. The maximum scavenging rate was 47.40% at a Trolox equivalent of 0.33 mg TE/mL for PTIO radicals. The FRAP reached 84.80% at 0.20 mg/mL concentration. The results confirmed the strong antioxidant activity of the extracts. Furthermore, 44 compounds, mostly terpenoids, obtained from the alcoholic extracts ofP. zhennanleaves were analyzed using HS-SPME-GC-MS and 15 of these compounds had a relative content exceeding 1%. The strong antioxidant activity of the alcoholic extracts ofP. zhennanleaves could be attributed to the presence of copaene (33.97%), β-caryophyllene (4.42%), δ-cadinene (11.04%), γ-muurolene (4.78%), cis-calamenene (2.02%), linalool (1.04%), α-pinene (1.46%), borneol acetate (1.5%), and γ-terpinene (0.66%). This study demonstrates the potential medicinal value of alcoholic extracts ofP. zhennanleaves.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengying Tao,Zhaowei Jia,Hui He,Yanhu Han,Xin Yu,Yaofei Ren,Yuewei Wu,Yintong Lin,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Photocatalytic reduction of CO 2 exhibits unsatisfactory photocatalytic performance owing to the inefficient separation of photogenerated electron-hole pairs, low CO 2 capture efficiency and limited visible light absorption on most photo-catalysts. Herein, Ti F bridged IL-CuCQDs-F/TiO 2 inverse opal composite (IO-CFTi) was constructed for boosting CO 2 visible-photo reduction via slow photo effect. In this work, ethylenediaminetetraacetic acid (EDTA(Cu)) and imidazole ionic liquid 1-(2-Hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([HOEtMIM][BF 4 ]) were employed to confine grow of IL-CuCQDs-F within TiO 2 inverse opal supporter via Ti F bonds connection. Unique IL-CuCQDs-F efficiently expended light absorption towards visible region, and the confined growth of IL-CuCQDs-F within the TiO 2 inverse opal cavity achieved the photoelectric conversion and efficient CO 2 capture. Moreover, their Ti F bonding interface of IO-CFTi assisted photogenerated electron transportation from TiO 2 to CO 2 for its reduction in this system. Consequently, IO-CFTi achieved a substantially increased CO production rate of 78.1 μmol·h −1 ·g −1 with 98 % selectivity. This improved performance in CO 2 photoreduction positions the nanocomposite as a promising material for preservation of the environment and conversion of energy.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiandie Zhang,Zhijie Fan,Heng Xu,Haozhe Li,Chongqing Deng,Xueqin Yang,Xiang Zhou,Xiaode Guo
In this work, NH 4 CuF 3 is utilized as the metal fluorine source and P(VDF-HFP) as the organic fluorine source to fabricate the Al-NH 4 CuF 3 @P(VDF-HFP) ternary energetic thin film via electrospinning technology. The continuous encapsulation of the components Al and NH 4 CuF 3 by P(VDF-HFP) endows the Al-NH 4 CuF 3 @P(VDF-HFP) composite with excellent hydrophobic properties and acid-alkali corrosion resistance, providing Al and NH 4 CuF 3 with anti-aging performance and stability in extreme environments. Additionally, the reaction performance of the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system is analyzed. The results indicate that the Al-NH 4 CuF 3 @P(VDF-HFP) ternary reaction system combines the performance advantages of both the Al-NH 4 CuF 3 and Al-P(VDF-HFP) binary reaction systems, namely low-temperature reaction and a high reaction rate. It is confirmed that the application of the double-F strategy can obtain an Al-NH 4 CuF 3 @P(VDF-HFP) combustion system with a high reaction rate, high ignition sensitivity, and high combustion efficiency. The combustion mechanism of composites is revealed by the analysis of gaseous and condensed products and performance analysis of reaction process. The aim of this study is to integrate the advantages of metal fluorine and organic fluorine to enhance the reaction properties of Al-based energetic composites.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2024
·Vol. 58
·期 8
·085203
·
IF 3.1
Min Li,Qi Liu,Haonan Tian,Jianqiao Ma,Jun Xie
According to the problem that the performance of film capacitors is limited due to the poor insulation of polypropylene (PP) film, a new nano-filler was studied and a PP composite dielectric was fabricated. The breakdown strength of composite dielectrics was measured and the mechanism for improving their insulation properties was analyzed. In this paper, TiO2 with high dielectric constant is plasma-treated and then coated with a layer of PP shell. TiO2 increases the dielectric constant of PP film composite dielectrics, and shell-like PP makes TiO2 more tightly bound to the PP matrix. Compared with pure PP, the breakdown voltage of TiO2–F is increased by 18.7%, and the breakdown voltage of TiO2–F@PP-mah is increased by 40.5%, and the new nano filler greatly improves the insulation performance of PP. The experimental results show that TiO2 introduces a low-density trap, TiO2–F introduces a high-density deep trap, and the modification of PP-mah slows down the dielectric constant conflict, increases the compatibility between the nanoparticles and the matrix, and increases the trap energy level. Based on the analysis of experimental results with different mass fractions, this paper proposes the optimal filling ratio of the new core-shell, which provides a new method for the composite dielectric to improve the insulation performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ying Qi,Huaming Yang,Chunli Li,Hao Li
During the storage/transportation of fruits and vegetables, ethylene-induced over-maturation and spoilage is a serious problem. Currently developed ethylene adsorbents exhibit great potentials due to their low cost and high efficiency, but always lack of water resistance. Herein, we developed Ag/F-Z5(X) adsorbents via the modification of ZSM-5 with different amounts of NH 4 F followed by silver loading, which exhibits enhanced ethylene adsorption and water resistance. Among the samples, Ag/F-Z5(25) featured with the largest capacity (6.44 mg·g −1 ) and the best water resistance, achieving near-complete removal of trace ethylene (100 ppm) at room temperature. Based on the characterizations, NH 4 F modification induced a hierarchical structure within the ZSM-5 framework, concurrently enhancing surface acidity, increasing the proportion of Ag + , and improving the dispersion of metals in the adsorbents. These enhancements collectively contribute to enhanced adsorption and water resistance. Further, banana storage experiments confirmed the actual preservation ability of Ag/F-Z5(25) thanks to the better adsorption and water resistance than unmodified Ag/Z5. These findings offer meaningful insights for developing high-efficient and water-resistant adsorbents to remove trace ethylene, consequently mitigating food aste and enlarging the commercial value of agricultural products.
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CELL BIOLOGY INTERNATIONAL
·
2021
·Vol. 45
·期 9
·1926-1934
·
IF 3.612
Yan Li,Zhongjie Qin,Lin Zhou,Khawar Ali Shahzad,Delin Xia
In the treatment of cardiovascular diseases, vascular scaffold materials play an extremely important role. The appropriate substrate chemistries and 15 dynes/cm 2 physiological fluid shear stress (FSS) are both required to ensure normal physiological activity of human umbilical vein endothelial cells (HUVECs). The present study reported the collective influence of substrate chemistries and FSS on HUVECs in the sense of its biological functions. The CH 3 , NH 2 , and OH functional groups were adopted to offer a variety of substrate chemistries on glass slides by the technology of self-assembled monolayers, whereas FSS was generated by a parallel-plate fluid flow system. Substrate chemistries on its own by no means had noticeable effects on eNOS, ATP, NO, and PGI 2 expressions, while FSS stimuli enhanced their production. While substrate chemistries, as well as FSS, were both exerted, the releases of ATP, NO, and PGI 2 were dependent on substrate chemistries. Study of F-actin organization and focal adhesions (FAs) formation of HUVECs before FSS exposure proves that F-action organization and FAs formation followed similar chemistry-dependence. Hereby proposed a feasible mechanism, that is, the F-actin organization and FAs formation of HUVECs are controlled by substrate chemistries, further advancing the modulation of FSS-triggered responses of HUVECs.
研究领域:
生物医学工程
·
细胞生物学
·
组织工程
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Xiangjun Li,Yuxin Shi,Miaomiao Li,Shengwei Deng,Yinxia Dong,Libo Tong,Zhongze Du,Kuaishe Wang
The exceptional protection of epoxy resin (EP) is restricted in practical applications due to high electrical insulation and inherent microporous defects. In this study, acid-doped polypyrrole (f-PPy)/MXene hybrid nanomaterials incorporated into the EP matrix to construct three-dimensional (3D) conductive network that simultaneously enhances corrosion resistance and imparts antistatic capability. Electrochemical impedance measurements demonstrate a long-term stability, maintaining 9.73 × 10 10 Ω cm 2 even after 14 days of immersion, which is significantly higher than the EP coatings. Compared with pure EP, the composite SiO 2 @f-PPy/MXene/EP coating shows a 3 times reduction in surface resistivity (8.68 × 10 7 Ω m) and exceeds the industrial antistatic threshold by two orders of magnitude. The enhanced anticorrosion is attributed to the synergistic contribution of the triple properties of the SiO 2 @f-PPy/MXene: “labyrinth effect”, redox effect and corrosion inhibition. SiO 2 @f-PPy/MXene 3D conductive network enhances the antistatic ability of EP. This dual-functional strategy addresses the critical gap of combining anticorrosion and antistatic performance in EP coatings and offers a practical route for protective applications on Mg alloys.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 10
·e70008
·
IF 3.8
Ying Xue,Zhuo Wang,Caidan Hou,Xin Li,Zixiong Sun
In TiO 2 colossal dielectric ceramics co-doped with In 3+ and Nb 5+ , the electron-pinned defect-dipoles effect is strongly influenced by the adjacent and overlapping interaction between diamond ( Nb 2 5 + Ti 3 + A Ti ${\mathrm{Nb}}_{\mathrm{2}}^{{\mathrm{5 + }}}{\mathrm{Ti}}^{{\mathrm{3 + }}}{{\mathrm{A}}}_{{\mathrm{Ti}}}$ (A = Ti 4+ /In 3+ /Ti 3+ )) and triangle ( In 2 3 + V O · · Ti 3 + ${\mathrm{In}}_{\mathrm{2}}^{{\mathrm{3 + }}}V_{\mathrm{O}}^{ \cdot \cdot }{\mathrm{Ti}}^{{\mathrm{3 + }}}$ ) defect clusters. Although acceptor doping introduces oxygen vacancies ( V O · · $V_{\mathrm{O}}^{ \cdot \cdot }$ ) that facilitate the formation of triangular ( In 2 3 + V O · · Ti 3 + ${\mathrm{In}}_{\mathrm{2}}^{{\mathrm{3 + }}}V_{\mathrm{O}}^{ \cdot \cdot }{\mathrm{Ti}}^{{\mathrm{3 + }}}$ ) defect clusters, this doping inevitably results in the presence of additional diamond ( Nb 2 5 + Ti 3 + A Ti ${\mathrm{Nb}}_{\mathrm{2}}^{{\mathrm{5 + }}}{\mathrm{Ti}}^{{\mathrm{3 + }}}{{\mathrm{A}}}_{{\mathrm{Ti}}}$ (A = In 3+ )) defect clusters. Unfortunately, this structure complexity hinders a clear understanding of the intrinsic relationship between the colossal dielectric properties and low-temperature dielectric relaxation associated with individual defect clusters. Therefore, creating novel defect clusters to achieve high electron localization is crucial for the advanced TiO 2 -based ceramics. Herein, a colossal dielectric constant of up to 3.4 × 10 4 and a low dielectric loss of 0.044 are observed at 1 kHz and room temperature for the first time in cation–anion (In 3+ and F − ) co-doped TiO 2 ceramics. Meanwhile, the materials exhibit excellent frequency stability and meet the temperature requirements defined by the X9R standard. Dielectric relaxation associated with electrons in the low-temperature range of 2–30 K is attributed to the generation of novel diamond defect clusters ( In 3 + Ti 4 + F 2 − ${\mathrm{In}}^{3+}{\mathrm{Ti}}^{4+}{\mathrm{F}}_{2}^{-}$ ). Combined with density functional theory calculations, the notable electronegativity of F − promotes electron localization without relying on V O · · $V_{\mathrm{O}}^{ \cdot \cdot }$ -related defect clusters formations. Overall, the study presents a novel strategy for designing next-generation colossal dielectric ceramics.
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ACS Catalysis
·
2025
·
IF 13.1
Fang Huang,Aihao Xu,Xiangyu Chen,Huanhuan Sun,Siyu He,Dong Wei,Boran Wang,Anxiang Guan,Xucai Yin,Jing Xu,Huibing He
The direct electrocatalytic conversion of carbon dioxide to methane using water as a medium is a reliable way to store intermittent renewable energy and solve environmental problems. However, in such multielectron/proton transfer reactions, the role of water is often overlooked. Specifically, the sluggish kinetics of water dissociation limit the effective proton supply during methane formation. Here, we propose a copper-doped CeO2 catalyst with frustrated Lewis pairs (FLPs), which can effectively reduce carbon dioxide to methane. Combined experimental analysis and theoretical calculations reveal that the synergistic interaction between Cu and FLPs forms an f-p-d gradient orbital coupling system, which significantly promotes water dissociation to generate active protons and optimizes the adsorption behavior of the *H and *COOH intermediates. Even at the large current density of −273 mA cm–2, the Faraday efficiency of Cu/CeO2-FLPs for methane was as high as 78.0%, with a conversion frequency of 15784.1 h–1 in the flow cell. This work provides a strategy for the rational design of efficient multipoint catalytic systems.
研究领域:
催化化学
·
电化学
·
材料科学
·
可再生能源
·
环境科学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Xiang-yu Kong,Ling-Jie Hou,Xiu-qing Shao,Shao-Min Shuang,Yu Wang,Chuan Dong
A novel fluorescent probe , phenolphthalein‑dialdehyde‑(2‑pyridyl) hydrazone (L), for sequentially detecting Al 3+ and F − in almost 100% aqueous medium was successfully designed and synthesized. The probe offers two binding pockets for Al 3+ to form a 1: 2 ligand/metal complex, leading to a significant fluorescence enhancement at 465 nm. Further, the in-situ formed L-Al complex acts as a secondary fluorescent chemosensor for F − by quenching the fluorescence of the complex with high selectivity. The detection limit for Al 3+ and F − sensing is 2.28 nM and 0.13 μM, respectively, which are far below the World Health Organization (WHO) acceptable limits (7.41 μM for Al 3+ ion and 79 μM for F − ) in drinking water . The probe L was successfully applied to the detection of Al 3+ and F − in cells using fluorescence microscopy .
研究领域:
分析化学
·
生物医学
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