Surfaces and Interfaces
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2024
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IF 5.7
Zhaolin Xu,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Guangjun Gou
With the development of communication and automatization technology, the demand for electromagnetic absorbing materials is continuously rising. The key problem lies in expanding and regulating the electromagnetic absorption band . Among these materials, carbonized polymers stand out in terms of electromagnetic absorption due to their lightweight, low cost and designability. The carbonized polymers can bridge varies of substances to construct lightweight nitrogen-doped carbon composites, achieving broadband and tunable-band designs. In this study, Fe-C-N anchored TiO 2 hierarchical structure is simply realized by carbonizing polypyrrole/MXene precursors. FeCl 3 are designed to be as the initiator for the polymerization of pyrrole and in situ as a doping Fe source. Moreover, by controlling the carbonization temperature, the electromagnetic absorption band can be obviously regulated from C to Ku band. The multi-layered TiO 2 structure brings enhanced structural losses and better electromagnetic energy dissipation pathways, while the crystalline/amorphous interfaces and hybridizations between Fe-C-N and TiO 2 boost the interfacial polarizations and dipole polarizations. Besides, the introduction of Fe compounds leads to ferromagnetism and magnetic losses, which improves the impedance matching. This work provides referencing ways for the design of broadband electromagnetic absorbing materials.
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BULLETIN OF MATERIALS SCIENCE
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2024
·Vol. 48
·期 1
·1-11
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IF 1.9
Wei D,Zhou Z F,Ma H H,Xu W B,Ren F M
Transition metal sulphides derived from metal–organic frameworks (MOFs) have gained increasing attention as promising electrode materials for energy storage, owing to their elevated theoretical capacitance and exceptional electrochemical features. Herein, a simple dual organic ligand strategy and controllable pyrolysis treatment were used to prepare porous micro-rods Co 9 S 8 /Ni 3 S 2 /NC-T (T denotes for temperature) composite materials. Their structure and composition can be precisely controlled by adjusting the pyrolysis temperature. Co 9 S 8 /Ni 3 S 2 /NC-T composite materials possess rich pore structures, unique three-dimensional carbon conductive networks and synergistic effects of Co 9 S 8 and Ni 3 S 2 . Experimental results of cyclic voltammetry revealed that the bimetal sulphides in Co 9 S 8 /Ni 3 S 2 /NC-T can provide substantial redox pseudocapacitance for electrochemical reactions. Electrochemical tests indicated that the optimal carbonization temperature was 700°C, and the Co 9 S 8 /Ni 3 S 2 /NC-700 electrode material has the highest specific capacity of 2288 F g −1 at a current density of 1 A g −1 and an excellent rate capability with retention of about 61.2% at a current density of 10 A g −1 . This study provides methodological guidance for the rational composition control and unique structure of MOF-derived materials for supercapacitors. Graphical
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yan Wang,Kangqi Cao,Wenlong Sun,Xiangxi Lin,Jianwei Wang,Jessica Villarreal,Longzhi Li
Microwave catalytic pyrolysis of lignin is one of emerging technologies for efficiently converting lignin into fuels and chemicals. Molecular sieves (HZSM-5) are widely used as carriers to load metallic components for biomass pyrolysis but often encounter challenges such as high diffusion resistance and insufficient acidity of acidic sites. Traditionally, HZSM-5 is directly modified to enhance the activity of the acidic sites, but this modification is ineffective in improving the metallic components’ activity. Instead, we made nitrogen doping on Fe and then supported on HZSM-5 to construct Fe-N 25 /HZSM-5 catalysts for microwave catalytic pyrolysis of lignin. The N-doped Fe has the effect of “killing two birds with one stone” on enhancing the catalytic activity. The characterization results indicated that N replaced C of the graphitic carbon network to form carbon nitride structure, and further combined with Fe to generate Fe-N bonds, improving the electronegativity of the metallic component. Besides, the loading of N-doped Fe increased the acidity of the catalyst. The utilization of 1.00Fe-N 25 /HZSM-5 obtained the greatest bio-gas yield (35.2 wt%), a hydrogen yield of 27.8 mL/min, bio-oil yield (36.4 wt%) and phenol selectivity of 46.2 %. The likely pathway of microwave catalytic pyrolysis on Fe-N 25 /HZSM-5 was proposed through DFT calculation, using guaiacol as a model compound. The results suggested that N-doped Fe on HZSM-5 8 T tended to break the side-chain methoxy during pyrolysis of guaiacol, with energy barrier of 0.14 eV. This paper provides a promising strategy for modification of microwave pyrolysis catalysts.
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Catalysts
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2024
·Vol. 14
·期 10
·681
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IF 3.8
Dezheng Li,Vilanculo Clesio Calebe,Yuqiao Li,Huimin Liu,Yiming Lei
Photocatalysis is a promising method for methylene blue (MB) degradation due to its effectiveness and environmental compatibility. Among the photocatalysts, titanium dioxide (TiO2) has been widely used for MB degradation due to its exceptional photocatalytic activity. However, the wide bandgap limits the degradation efficiency of TiO2under visible light. Here, an interstitial nitrogen-doped TiO2(5%NT/TiO2) used thiourea as the N source was fabricated for visible light-derived MB degradation. The 5%NT/TiO2exhibited an extended absorption range of visible light. Moreover, photoelectrochemical measurements showed an improvement in the photocurrent response and charge transfer behavior on N/TiO2. Thus, 5%NT/TiO2had enhanced photocatalytic activity compared with pristine TiO2and substitutive N-doped TiO2(5%NAB/TiO2). The accelerated photocatalytic MB degradation process on N/TiO2could be mainly attributed to the interstitial N doping, which caused the appearance of new energy states and extended optical properties. Through comparing the impact of interstitial and substitutive in TiO2activity, our work proposes a suitable form of element doping to enhance the optical properties and photocatalytic activity of TiO2and even other semiconductors, providing guidance for future work.
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FUEL
·
2024
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IF 6.7
Haojie Hu,Shuofan Li,Yuanfeng Wang,Ruochen Yang,Jianxun Wu,Weilai Zhang,Chen He,Han Li,Yahe Zhang,Di Zhu,Quan Shi
Petroleum acids are widely present in crude oil and are important indicators of generation and preservation of the crude oil. However, it is difficult to analyze these compounds using gas chromatography due to their strong polarity and low volatility. In this work, we established a method to reduce petroleum acids into corresponding hydrocarbons using n -butylsilane as the reducing agent. The reduced products of the acids from three crude oils with different geological origin were analyzed by gas chromatography-mass spectrometry and high resolution Orbitrap mass spectrometry coupled with electrospray ionization. Various hydrocarbons with specific biomarker carbon skeletons were identified in the reduced products and compared to the corresponding compounds in the saturates of the crude oils, which provides molecular clues for the understanding of the geochemical formation mechanism of petroleum acids. The results show large difference in molecular composition of petroleum acids in different crude oils. The Liaohe acids were composed of fatty acids which should be primary acids in source rock or derived from low-maturity kerogen. In contrast, the Xinjiang and Shengli acids were dominated with naphthenic acids. Xinjiang naphthenic acids showed good consistency in carbon skeleton and carbon number with the saturates. This indicates that these naphthenic acids originate from the bio-oxidation and degradation of cycloalkanes, which can also be further decarboxylated and degraded to generate cycloalkanes. Abundant 8,14-secohopanes and 25-norhopanes and corresponding acids were detected in Shengli crude oil. The compositional differences between the acids and corresponding hydrocarbons suggests that biodegradation occurs preferentially on large molecules with long side chains and has structural selectivity on the isomers. The results implies that 25-norhopanic acids seems to be the intermediates for the biodegradation of hopanes to 25-norhopanes.
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Lipids in Health and Disease
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2024
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IF 3.9
Shuting Wang,Huasong Bai,Tong Liu,Jiayi Yang,Zhanzhong Wang
Omega-3 polyunsaturated fatty acids (n-3 PUFAs), mainly including α-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), possess antioxidant properties and play a crucial role in growth and development. However, the combined effects of ALA, EPA, and DHA at different concentrations have rarely been reported. This work explored the effects of EPA, ALA, and DHA on the viability and antioxidant capacity of mouse hepatocytes, with the objective of enhancing the antioxidant capacity. Within the appropriate concentration range, cell viability and the activity of glutathione S-transferase, superoxide dismutase, and catalase were increased, while the oxidation products of malondialdehyde and the level of intracellular reactive oxygen species were obviously reduced. Thus, oxidative stress was relieved, and cellular antioxidant levels were improved. Finally, response surface optimization was carried out for EPA, ALA, and DHA, and the model was established. The antioxidant capacity of the cells was highest at EPA, ALA, and DHA concentrations of 145.46, 405.05, and 551.52 µM, respectively. These findings lay the foundation for further exploration of the interactive mechanisms of n-3 PUFAs in the body, as well as their applications in nutraceutical food. Supplementary Information The online version contains supplementary material available at 10.1186/s12944-024-02202-0.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Fangyou Meng,Jiaqi Zhu,Kaiyi Shi,Xue Wang,Junhong Zhou,Shuangzhu Jia,Yuan Yu
Theoretically, the stronger electronegativity of N compared to that of P suggests that N-doped FeP4 could reduce the adsorption energy of hydrogen, potentially enhancing the kinetics of the hydrogen evolution reaction (HER) and improving its electrochemical characteristics. Experimentally, a three-dimensional (3D) porous dodecahedron N-doped FeP4 nanoparticle array catalyst developed on carbon cloth (CC) was investigated. The synthesized N-doped FeP4/CC nanoparticle electrocatalysts demonstrated satisfactory HER performance. These electrocatalysts showed a current density (J) of 10 mA/cm–2 at an overvoltage of 87 mV in a 0.5 M H2SO4 solution, indicating that the electronically modified FeP4 (N-FeP4/CC) catalyst exhibited superior HER activity. Additionally, the overpotential for the N-doped FeP4/CC nanoparticle catalyst was 347 mV for HER in simulated seawater solution (0.5 M H2SO4 + 0.5 M NaCl), demonstrating the exceptional catalytic activity of the N-doped FeP4/CC nanoparticle catalyst. Density functional theory (DFT) calculations showed that N doping could synergistically improve the Gibbs free energy of hydrogen adsorption (ΔGH*) of FeP4 (−0.29 eV), which was lower than that of undoped FeP4 (0.41 eV). This supports the theoretical proposition that modifying the electronic structure can enhance the electrolysis hydrodynamics and catalytic performance, aligning with experimental findings. This study may provide a strategy for optimizing the electronic structure of seawater splitting.
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DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Mei-Xia Zhao,Bo Meng,Juan-Juan Zheng,Ning Yang,Fang-Jing Liu
Lignite-derived residue with cross-linked aromatic structure and heteroatom groups is an alternative and low-cost precursor for porous carbon. Herein, N-doped hierarchically porous carbon (NDHPC) was prepared by KOH activation from lignite-derived residue using ZnO as the template and dicyandiamide as the nitrogen source. The optimal NDHPC presents hierarchically porous stacked layered structure with high specific surface area (2648.18 m 2 /g) and contains abundant O/N functional groups, making it promising candidate as the electrode material. Introducing nitrogen can provide more pseudocapacitors and meanwhile improve the wettability of the NDHPC, thus enhancing electrochemical performance. The optimal NDHPC exhibits a high specific capacitance of 336 F g −1 at the current density of 0.5 A g −1 with good rate performance. Additionally, the assembled NDHPC symmetrical supercapacitor presents outstanding cycle stability with 96.2 % capacitance retention and possesses energy density of 7.85 Wh kg −1 at power density of 250 W kg −1 . This study offers an effective and low-cost approach to fully utilize the organic matter in coal-derived residue for preparing supercapacitor electrode materials.
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Nanomaterials
·
2024
·Vol. 14
·期 14
·1188
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IF 4.4
Hongyang Wu,Chen Chen
The efficient detection of n-butanol, which is in demand for highly sensitive materials, is essential for multiple applications. A nonaqueous method was applied to prepare NiFe2O4nanoparticles (NPs) using benzyl alcohol as a solvent, which shows a size of 7.9 ± 1.6 nm and a large surface area of 82.23 m2/g. To further improve the sensing performance for n-butanol, Pd/PdO functionalization was sensitized with NiFe2O4NPs. Gas sensing results demonstrate that the Pd/PdO-NiFe2O4exhibits an enhanced response of 36.9 to 300 ppm n-butanol and a fast response and recovery time (18.2/17.6 s) at 260 °C. Furthermore, the Pd/PdO-NiFe2O4-based sensor possesses a good linear relationship between responses and the n-butanol concentration from 1 to 1000 ppm, and great selectivity against other volatile organic compounds (VOCs). The excellent sensing enhancement is attributed to the catalytic effects of Pd/PdO, the increase of oxygen vacancies, and the formation of heterojunction between PdO and NiFe2O4. Thus, this study offers an effective route for the synthesis of Pd/PdO-functionalized NiFe2O4NPs to achieve n-butanol detection with excellent sensing performance.
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Journal of the Taiwan Institute of Chemical Engineers
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2024
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IF 5.5
Bo Wang,Zhenxing Wang,Yu Wan,Yimu Wang,Shuang Gao,Yan Chen,Qingsong Luo,Changhao Feng
Background Developing high-performance n -butanol gas sensors is of great significance for environmental protection and human health. The Bi-doped ZnFe 2 O 4 nanofibers exhibit promising potential as a viable option for n- butanol sensors. Methods In this study, a series of high response and fast response n -butanol gas sensors were successfully fabricated by Bi-doped ZnFe 2 O 4 nanofibers with different atomic percentages (0 %, 1 %, 3 %, 5 %), which were synthesized by a facile electrospinning method. Significant findings The nanofibers with a Bi/Zn molar ratio of 3 % showed a response value of 23.6 to 100 ppm n -butanol at 175 °C, which was 2.4 times higher than that of the pure ZnFe 2 O 4 nanofibers, and with a lower concentration detection limit (1.5 for 100 ppb n -butanol). In addition, the gas sensing materials had a good selectivity and long-term stability to n -butanol, and the mechanism of the good sensing performance of Bi doped ZnFe 2 O 4 nanofibers for n -butanol is also analyzed in this paper.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Kuikun Gu,Xinyue Du,Xueying Song,Yu Wang,Zhongbao Luo,Xiaodong Yang,Mingzhe Zhang
The ternary metal oxides that combine two different metal cations is an interesting candidate as sensing material based on their interesting properties. Hence, ordered dendrite InWO 4 was successfully synthesized via a hydrothermal method, followed by the construction of an InWO 4 -rGO heterojunction to enhance detection capability for triethylamine (TEA) gas. The synthesized product underwent morphology and elemental composition analysis using various techniques. Gas sensing experiments revealed that the InWO 4 -rGO gas sensor, operating at the optimal temperature of 220 ℃, displayed a significantly improved response to 100 ppm TEA, with a high value of 59.5, in comparison to the pure InWO 4 gas sensor (11.5 at 250 ℃). Additionally, the recovery time was reduced from 184 s to 122 s. Based on experimental data and gas sensing reaction theory, this study attributes the improved gas sensing performance to the formation of p-n heterojunction, a larger specific surface area and rGO's catalytic effect. This study not only introduces a novel addition to the gas sensing material family but also promotes the development of advanced gas sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Xiao Xue,Hui Chen,Chongbo Zhang,Jiayu Li,Siwen Tao,Xinhua Tian,Ruiqin Gao,Meihong Fan,Ni Bai,Guo-Dong Li
n -butanol detection is crucial to environmental protection and mankind’s health because of its toxicity and irritation to the respiratory system. Mono-metal oxide semiconductors (such as SnO 2 ) often face disadvantages such as low sensitivity, insufficient selectivity, and a high detection limit. Constructing heterojunctions has been considered an efficient way to enhance the performance of MOS gas sensors. This work presents the synthesis of a series of β -CdSnO 3 -SnO 2 nanorod-like heterostructures with good n -butanol sensitivity using a hydrothermal and post-calcination approach. The optimized CSO/SO-8 shows the highest response value about 90–100 ppm n -butanol at 190 °C, which is 15 times greater than that of SnO 2 , and 6.5 times more than that of β -CdSnO 3 . Meanwhile, the CSO/SO-8 also exhibits a short response and recovery time (1–2 s/63 s). More importantly, the detection limit is reduced to ppb level (50 ppb). The improved gas-sensitive properties can be explained by the formation of n - n heterojunctions between β -CdSnO 3 and SnO 2 , which increases the content of chemisorbed oxygen, thus enhancing the performance of the gas-sensitive. Our work not only provides a material with n - n heterostructures but also the strategy for constructing heterojunctions to improve gas-sensitive properties.
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