APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xiao Yang,Rong Qiang,Yulong Shao,Fangjie Ren,Lei Rong,Jingbo Fang,Rui Xue,Zihan Liu
With the advancement of modern electronic communication technology, the development of efficient absorbing materials has attracted great interest. Here, hollow hydrangea-like Mo 2 C/MoO 2 /C composites are synthesized by soft template method. By adjusting the pyrolysis temperature, Mo 2 C/MoO 2 /C composites with different Mo 2 C and MoO 2 contents and degrees of graphitization can be selectively synthesized. The Mo 2 C/MoO 2 /C-800 composite with the 30 wt% filler content exhibits a minimum reflection loss of −62.9 dB at 1.6 mm and achieves a maximum absorption bandwidth of 6.2 GHz at 1.9 mm. The interaction between the dielectric properties of each component and the unique 3D hydrangea-like structure promotes microwave absorption and dissipation. Besides, CST simulation further demonstrates the effectiveness of electromagnetic wave dissipation in practical applications. The excellent properties of the hydrangea-like Mo 2 C/MoO 2 /C composites indicate their promising applications in electromagnetic wave absorbers.
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高影响因子
FUEL
·
2025
·
IF 7.5
Geng Chen,Zexiang Bi,Xu Li,Jinxiang Dong
The industrial utilisation of Fischer–Tropsch synthesis (FTS) products, particularly the valuable C5–C9 linear α-olefins, has been hindered by the high energy-intensive separation of olefins and alkanes with identical carbon numbers. This study presents a comprehensive process integrating the selective dimerisation of linear α-olefins to α-olefin dimers, enabling their separation from paraffins in FTS products. These dimers are subsequently converted into branched-chain aldehyde intermediates through heterogeneous hydroformylation using Rh/C as the catalyst. Notably, optimising the reaction conditions achieved the main product aldehyde of α-olefin dimers with excellent selectivity (up to 86.66 %) at 65 °C, compared to linear α-olefins, which exhibited only 49.31 % selectivity. In-situ IR spectroscopy was used to monitor the entire reaction process. The resulting branched aldehyde intermediates were further transformed into branched acids or branched alcohols through oxidation or reduction reactions, respectively. These products have diverse applications as surfactants, coal flotation agents, and cutting fluid additives. The synthesised compounds were characterised using FT-IR, GC, GC–MS, and NMR. In addition, a comprehensive evaluation of their physicochemical properties was conducted. This study provides a versatile design strategy for developing high-value intermediates from α-olefins in the FTS.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yugang Shu,Jiaguang Zheng,Chengguo Yan,Ao Xia,Meiling Lv,Zhenxuan Ma,Zhendong Yao
NaBH 4 was widely regarded as a low-cost hydrogen storage material due to its high-mass hydrogen capacity of approximately 10.8% (mass) and high volumetric hydrogen capacity of around 115 g·L –1 . However, it exhibits strong stability and requires temperatures above 500 °C for hydrogen release in practical applications. In this study, two polyhydric alcohols, xylitol and erythritol (XE), were prepared as a binary eutectic sugar alcohol through a grinding-melting method. This binary eutectic sugar alcohol was used as a proton-hydrogen carrier to destabilize NaBH 4 . The 19NaBH 4 -16XE composite material prepared by ball milling could start releasing hydrogen at 57.5 °C, and the total hydrogen release can reach over 88.8% (4.45% (mass)) of the theoretical capacity. When the 19NaBH 4 -16XE composite was pressed into solid blocks, the volumetric hydrogen capacity of the block-shaped composite could reach 67.2 g·L –1 . By controlling the temperature, the hydrogen desorption capacity of the NaBH 4 -XE composite material was controllable, which has great potential for achieving solid-state hydrogen production from NaBH 4 .
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Science Bulletin
·
2024
·
IF 18.8
Wei Lv,Zilei Shen,Junlin Liu,Xudong Li,Fang Ding,Dongyue Zhang,Licheng Miao,Xuefeng Lyu,Ruijie Li,Miaomiao Wang,Yiming Li,Jingwen Meng,Chao Xu
In this study, we successfully synthesized a δ-MnO 2 cathode with O vacancies, encapsulated by C derived from pyromellitic acid, using a facile hydrothermal method followed by annealing in an Ar atmosphere. The cathode’s structural stability and charge transfer kinetics are enhanced by inhibiting the formation of the by-product Zn 4 SO 4 (OH) 6 ·4H 2 O, regulating the Mn valence state, and suppressing the Jahn–Teller effect through the synergy of C encapsulation and O vacancies. This results in remarkable electrochemical performance, including a large capacity of 421.2 mAh g −1 at 0.1 A g −1 , a high specific energy density of 595.53 Wh kg −1 , and exceptional long-cycle life stability with 90.88% over 4000 cycles at 10 A g −1 , together with superior coulombic efficiency (∼100%) in pure ZnSO 4 electrolyte. Moreover, the cathode materials demonstrate specific antitumor efficacy. In brief, this work introduces an in situ synthetic C encapsulated δ-MnO 2 with O vacancies expected to be applied in both large-scale energy storage and biomedicine.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Haotian Duan,Wenyang Li,Lixiu Ran,Fulong Zhu,Tianxiang Li,Ming Miao,Wen-jin Yin,Xin Wang,Yongzhu Fu
The conversion of carbon dioxide to ethylene by electrochemical reduction (CO 2 RR) provides a new strategy for achieving carbon dioxide conversion. However, copper-based catalysts have the disadvantages of unsatisfactory selectivity and low current density, which limit the potential CO 2 RR industrial expansion. Researches have verified that the real reaction sites at the catalyst surface often undergo reconstruction during the reaction, therefore, understanding and utilizing this phenomenon is crucial for improving catalytic performance. In this work, we introduced additional Ag component into Cu@Ag/C tandem catalyst by in-situ electrochemical reconstruction of Cu 2 CO 3 (OH) 2 /AgCl/C precursor. This electro-reduced catalyst exhibits a C 2 H 4 Faradaic efficiency of 50.41% in H-cell, and 58.03% in the flow cell, surpassing the counterparts of pure Cu and Ag, as well as the Cu-Ag homolog with separated interface. Moreover, it also provides a long-term stability of 21 h with the ethylene Faraday efficiency (FE) over 50%. The appropriate amount of Ag dopant into the Cu catalyst changes the electronic structure of Cu surface by the electron transfer from Cu to Ag, which distinctly enhances the binding energy of CO 2 on the catalyst. Meanwhile, in-situ Raman results and theoretical calculation reveal that the introduction of silver increases the number of active sites and improves the coverage of *CO intermediate, thereby accelerating the kinetics of C–C coupling and reducing its energy barrier. The combination of cascade catalytic strategy and in-situ electroreduction interface provides potential applications for future artificial carbon balance.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
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IF 8
Fengzhen Gao,Junxuan Liang,Faying Fan,Rui Wang,Benshuai Jiang,Kewei Zhang
Electrochemical gas sensors (EGSs) are the most effective means for detecting NO 2 gas in industry, while facing the issue of exorbitant cost due to the use of expensive Pt catalyst. Herein, well-dispersed C-SiO 2 into polytetrafluoroethylene (PTFE) was adopt as high-stable gas diffusion membrane for ultrafast electrochemical NO 2 sensors. The nano-SiO 2 not only prevents material aggregation but also constructs porous networks between the gas diffusion electrode and gas molecules, providing a larger sensing area for high sensor performance. The fabricated sensor exhibits excellent response linearity, short response time, and high stability. As compared with commercial Pt/C electrode, the sensor response is improved by 170 %. Moreover, a multiple linear regression model was introduced to predict the response values of NO 2 in the range of 5–100 ppm, achieving only 1.5 % deviation from the real values. This work not only demonstrates the feasibility of non-precious metals in gas diffusion membranes but also provides guide for designing next-generation low-cost EGSs.
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高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 155
·期 1
·1-10
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IF 2.3
Wu Zexin,Zhang Haoyu,Zhao Junyu,Hao Hongshun,Yan Shuang
A strategy was proposed for the synthesis of Mo 2 C/C composite as an efficient electrocatalyst through electrospinning and calcination. PVP and PAN were utilized as electrospinning precursors for comparative analysis. Morphological characterization revealed that an electrospinning solution with the viscosity in the range of 2–5 mPa·S was conducive to the formation of spherical morphology. Under calcination at nitrogen atmosphere, as-electrospun Mo@PVP-1 and Mo@PAN-1 samples transformed into Mo 2 C/C with bead-like structure at 900 and 800 °C, respectively. Compared to PVP, PAN exhibited greater resistance to deformation at elevated temperature, resulting in better-dispersed spherical Mo 2 C/C composite. The synthesized Mo 2 C/C exhibited good electrocatalytic activity for hydrogen evolution reaction. The Tafel slopes of Mo 2 C/C prepared from Mo@PVP-1-900 and Mo@PAN-1-800 were 75.85 and 164.7 mV·dec −1 , respectively. This work contributes to the understanding of synthetic process of spherical Mo 2 C/C composites through electrospinning, providing an effective way to improve material performance. Graphical Mo 2 C/C composites were synthesized by calcination with different polymer solutions (PAN and PVP) by electrostatic spraying, and their performance as catalysts was tested.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Junjie Cheng,Xinman Tu,Pengxuan Wu,Rentao zhou,Shaohua Luo,Li Zhang,Jianping Zou,Yanhong Li,Hannah M. Johnson,Qiang Zhang
In the reaction systems involving peroxymonosulfate (PMS) activation, the degradation of organic pollutants is influenced by the distinct roles played by the oxidation of free radicals and non-free radicals. The synergistic effect resulting from both oxidation pathways is often more efficient compared to a single oxidation pathway, as it allows for the optimal utilization of oxidation capacity and adaptation to complex reaction environments. Nitrogen-doped carbon substrates hosting single-atom catalysts (SACs) are anticipated to serve as an optimal platform for managing the dual oxidation pathways in the PMS activation reaction. This is attributed to the availability of numerous reaction sites that meet the activation requirements. However, there's a lack of substantial reports on this subject. Herein, we synthesized a series of single-atoms Fe nitrogen-doped carbon catalysts with different coordination structures by adjusting the coordination numbers between Fe and N atoms. It is used to investigate the reaction pattern of PMS over SACs, so as to enhance the catalytic efficacy of SACs through distinct coordination structures. The experimental and theoretical results indicate that PMS functions as both an electron receiver and provider on FeN x /C catalysts. Moreover, the specific arrangement of the Fe-N-C structure influences the exchange of electrons between the catalysts and PMS. Hence, the co-oxidation pathway of free radicals ( OH, SO 4 − and O 2 − ) and non-free radicals ( 1 O 2 ) can be modulated by altering the coordination number of Fe and N atoms during PMS activation. The elimination efficiency of tetracycline hydrochloride was significantly enhanced due to the abundance of both free radical and non-free radical species generated in the FeN 3 /C/PMS reaction system, exhibiting a degradation kinetic constant of 0.564 min −1 . In addition, it showed promising potential for application in practical wastewater degradation, exhibiting high anti-interference to general environmental disturbances (such as humic acid, chloride ions, bicarbonate ions and nitrate ions).
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2024
·
IF 3.1
Chen Yang,Li Zeng-yi,Tan Hao-bo,Fu Yu-ran,Ding Jun,Deng Cheng-ji,Yu Chao
To solve the problem of poor high-temperature service performance caused by low carbonization of MgO–C refractories, low-carbon MgO–C refractories with excellent thermal shock, oxidation and corrosion resistances were successfully designed by using SiC whiskers as reinforcing phases and introducing micro-Al 2 O 3 powders as additives. The results indicated that the addition of micro-Al 2 O 3 powders optimized the internal structure of the material, like the columnar β-Si 3 N 4 with a stepped distribution and the mosaic structure formed between granular and flaky Mg 2 SiO 4 , which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock resistance. Specifically, the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa, respectively. Moreover, the addition of micro-Al 2 O 3 powders promoted the formation of fine particles of Mg 2 SiO 4 , MgAl 2 O 4 and MgO, as well as a dense protective layer of Mg 2 SiO 4 in the material under high-temperature environment. Furthermore, spinel and high-temperature solid solution were formed in the corrosion environment. The oxidation and corrosion resistances were greatly improved by 41% and 15%, respectively.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2024
·
IF 9.4
Qinghong Pan,Huafang Zhang,Qiaoling Liu,Donghong Huang,Da-Peng Yang,Tianjia Jiang,Shuyang Sun,Xiangrong Chen
ABSTRACT Quantitative determination of tetracycline (TC) in environment and foods is of great importance, as excessive residues might have negative effects on human health and environmental risks. Herein, a self-powered molecularly imprinted photoelectrochemical (PEC) sensor based on the ZnO/C photoanode and the Fe-doped CuBi 2 O 4 (CBFO) photocathode is developed for the sensitive detection of TC. The photocathodic current can be amplified by the efficient electron transfer caused by the Fermi energy level gap between the photoanode and photocathode. Furthermore, molecularly imprinted polymers (MIPs) at photocathode can selectivity identify the TC templates and thus improve the specificity. Under the optimal conditions, the sensor has a linear range of 10 ‒2 -1.0 × 10 5 nmol/L, and a limit of detection (LOD) of 0.007 nmol/L (S/N = 3). More crucially, the milk sample detection is carried out using the as-prepared sensor, and the outcome is satisfactory. The research gives us a novel sensing platform for quick and accurate antibiotic (like TC) in environment and food monitoring.
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TALANTA
·
2024
·
IF 5.6
Yuting Xu,Lili Li,Yumeng Yang,Chengzhi Huang,Hongyan Zou
Developing a simple, reliable, and sensitive hepatitis C virus (HCV) genetic sensing platform is of great significance for diagnosing diseases and selecting appropriate antiviral treatments. Herein, a tandem nucleic acid amplification strategy for sensitive detection of HCV genotype 1b (HCV-1b) was developed by stringing the catalytic hairpin assembly (CHA) and the triggered DNAzyme amplifier. The hairpin reactants were initiated by the target to produce lots of triggering double-stranded DNA sequences which can efficiently activate the subsequent blocked DNAzyme. Thereby, the continuous cleavage of substrate was realized, resulting in the fluorescence signal amplification. The DNA-based isothermal CHA-DNAzyme (CDz) sensing platform was successfully applied for sensitive detection of HCV-1b with the limit of detection (84 pM) and showed good selectivity. Moreover, the practical detection of target DNA in the complex biologic matrix indicated that the developing strategy had good potential for early HCV infection diagnosis.
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PubMed
高影响因子
FLAVOUR AND FRAGRANCE JOURNAL
·
2025
·
IF 2
Tanfang Xu,Junfeng Liu,Ping Wang,Junfeng Zan,Ke Yang,Daizhi Tian,Maohua Chen,Yanhua Li
Thymol (THY) is a natural antioxidant and antimicrobial; however, its biological activity and application in the food and pharmaceutical fields are limited due to its low water solubility and volatility. In this study, inclusion complexes of cationic-β-cyclodextrin-THY (C-β-CD-THY) were prepared by using the aqueous stirring method. Then UV–Vis spectra, FT-IR, NMR, DSC, XRD and SEM data were collected to characterise the structure and morphology of the inclusion complexes. Phase solubility experiments showed a better solubilisation effect of C-β-CD-THY than HP-β-CD-THY. At a concentration of 0.64 mmol/L for THY, the DPPH scavenging rate was 60.99% and 61.31% for HP-β-CD-THY and C-β-CD-THY, respectively, whereas that of THY in 10% ethanol was only 43.47%. The bacteriostatic activity was verified using a circle of inhibition and the live/dead bacterial double stain. C-β-CD-THY exhibited better antimicrobial activities against Escherichia coli and Staphylococcus aureus than HP-β-CD-THY. In conclusion, the C-β-CD-THY inclusion complexes have the potential to be applied as an effective bacteriostatic agent for food and pharmaceutical applications.
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