Small Methods
·
2026
·
IF 8.7
Yiting Zhu,Zixiang Zhao,Qiancheng Zhang,Dou Zhang,Zizhao Ding,Chao Jiang
Graphene-based aerogels have received substantial attention in the realm of effective electromagnetic wave absorption due to their lightweight qualities and unusual three-dimensional network structure. This work creates a Hollow MnFe 2 O 4 @ C/reduced graphene oxide (RGO)/polyimide (PI) composite aerogel by anchoring hollow ferrite@carbon particles onto graphene using a two-step hydrothermal process and freeze-drying. The electromagnetic properties are adjusted by adjusting the thickness of the carbon shell layer, managing the defect density within the aerogel, improving polarization loss, and enriching internal heterogeneous interfaces. This aerogel has a maximum effective absorption bandwidth of 7.70 GHz and a minimum reflection loss of −68.04 dB. Under volumetric deformation, the composite aerogel continues to perform exceptionally well in terms of absorption. Its maximum effective absorption bandwidths are 7.50 and 7.87 GHz, and its minimum reflection loss at 30% and 50% compression is −79.49 and −60.01 dB, respectively. The impedance mismatch disadvantage brought on by aerogel compression is offset by the synergistic improvement of absorption performance through several loss modes. This aerogel can also tolerate more complicated and demanding settings because it has certain compressive strength and flexibility, as well as fire resistance and thermal insulation. It offers a strong basis for multifunctional absorber material research.
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高影响因子
NEW CARBON MATERIALS
·
2026
·Vol. 41
·期 3
·568-582
·
IF 7.2
Lin Qu,Yajing Wang,Wenpei Yuan,Pengyu Liu,Yanlan Zhang,Yongzhen Wang
Recently, increasingly severe electromagnetic radiation has caused harm to precision equipment and human health, which requires the development of effective electromagnetic wave (EMW) absorption materials. These materials require both a strong absorption and a broad bandwidth at low filling rates and small thicknesses. To meet this requirement we have constructed a cobaltiron/carbon@polypyrrole (CoFe/C@PPy) composite by a two-step synthesis process. The first is the fabrication of magnetic CoFe/C fibers, followed by their coating with a PPy layer with a controlled thickness. This combination of materials results in a magnetic loss from CoFe/C and a dielectric loss from PPy which improves both impedance matching and EMW dissipation. An optimized material has a PPy layer with a thickness of 2.0 mm and a loading of 10% and has a minimum reflection loss ( RL min ) of −45.6 dB at 14.64 GHz, and the corresponding effective absorption bandwidth is 5.12 GHz. Furthermore, CST Studio simulations and far-field radar cross-section (RCS) analysis validate its practical use, showing a notable RCS reduction of up to 37.5 dBm 2 for a perfect electric conductor.
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Energy & Environmental Materials
·
2026
·
IF 13.8
Xue Li,Ling Weng,Lizhu Guan,Xiaoming Wang,Ze Li,Xiaorui Zhang,Ruiqun Pan,Yuhan Li,Zijian Wu,Yingtang Zhang
Polymer films offer advantages for capacitors, but high-temperature operation requires new dielectric materials. This study develops a molecular engineering strategy for poly(amide-ester-imide) (PAEI). Skeleton customization via amide groups and ultra-long chains enhances the dielectric constant (ε r ) through optimized dipole alignment. Simultaneously, electrostatic interactions between PAEI and the organic semiconductor [6,6]-phenyl-C61 butyric acid methyl ester (PC61BM) promote hydrogen bonding, constructing a robust crosslinked network. Leveraging PC61BM's unique high electron affinity, the composite exhibits strong electron-trapping capability, significantly reducing high-temperature conduction loss (achieving an ultralow conductivity of 4.97 × 10 −13 S cm −1 at 200 °C). This synergistic effect suppresses carrier mobility by constructing deep electron traps. The resulting nanocomposite demonstrates breakthrough performance: ultralow conductivity and exceptional energy storage characteristics ( U e is 5.16 J cm −3 with η is 90.7% at 200 °C). Multiscale validation-integrating DFT calculations, MD simulations, phase-field simulations, and experimental characterization-confirms that the molecularly engineered crosslinked network suppresses leakage current by trapping charges and restricting chain segment motion under coupled thermal/electrical stress. This work establishes a robust molecular blueprint for extreme-condition dielectrics, demonstrating how nanoscale interfacial engineering bridges molecular design to macroscopic high-temperature capacitive performance. The strategy provides a new pathway for next-generation energy storage materials operating in harsh environments.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhixiao Wang,Qun Li,Tao Yang,Qiuye Liu,Kang Wang,Enhui Wang,Yanglong Hou,Xinmei Hou
Triple-layered C@SiC@SiO 2 microspheres were successfully fabricated. • Superb RL of −62.95 dB and 3.05 GHz bandwidth are achieved at thinness. • Gradient impedance structure boosts wave penetration and attenuation. Gradient structural engineering holds great promise in boosting microwave absorption capability by realizing smooth impedance matching and manipulating electromagnetic wave transportation within materials. Herein, well-defined triple-layered C@SiC@SiO 2 microspheres with a dielectric gradient architecture are rationally constructed via hydrothermal self-assembly followed by carbothermal reduction. By delicately regulating the composition ratio of C/SiC/SiO 2 , the optimized absorber achieves outstanding room-temperature microwave absorption properties: a minimum reflection loss (RL min ) of −62.95 dB at a thin thickness of 1.73 mm, and a broad effective absorption bandwidth (EAB max) of 3.05 GHz (RL < −10 dB) at merely 1.68 mm, which covers the most of the X-band. The excellent absorption performance is synergistically contributed by the significantly optimized impedance matching originating from the three-layer dielectric gradient architecture, abundant heterogeneous interfaces inducing intense interfacial polarization, as well as rich dipoles favoring strong dipole polarization. Moreover, the gradient structure also promotes multiple scattering and reflection of electromagnetic waves, further enhancing energy attenuation. This work not only develops a high-performance microwave absorber but also offers a feasible strategy for designing gradient heterostructures toward advanced electromagnetic wave absorption applications. Download: Download high-res image (130KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Lulu Pang,Haoran Li,Zhong Qi,Yaxin Liu,Yandan Du,Peng Pan,Huayi Li,Jie He,Hong Dong,Yahui Cheng,Rui Zhang,Zhengchun Yang
Nitrite is a widespread contaminant in environmental and food systems, and its excessive intake poses significant risks to human health, creating an urgent need for sensitive and robust detection technologies. The performance of conventional electrochemical sensors is often limited by the limited conductivity, aggregation tendency, and interfacial instability of copper-oxide-based materials. A CuO/Cu 2 O/C composite electrode was developed through controlled thermal treatment, where mixed-valence copper oxides are integrated into a conductive carbon framework to address these intrinsic limitations. The optimized CuO/Cu 2 O/C electrode exhibits outstanding electrocatalytic performance toward nitrite oxidation, delivering a broad linear range (2 μM–5000 μM), high sensitivity (52.32 μA μM −1 cm −2 ), and a low detection limit (0.101 μM). The results indicate that the prepared CuO/Cu 2 O/C composite material promotes charge separation and transfer through the heterojunction interface, utilizing the Cu 2+ /Cu + redox couple to provide abundant active sites. Moreover, the carbon substrate not only improves conductivity, inhibits particle aggregation, and increases the electrochemical active area, but also optimizes the oxidation state of copper to the Cu 2+ /Cu + redox pair. These findings provide a promising materials platform and meaningful guidance for the rational design of copper-oxide-based composites tailored for high-performance electrochemical sensing.
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Materials Horizons
·
2025
·
IF 10.7
Jian-Hui Zheng,Chang-Long Tan,Ming-Yu Qi,Zi-Rong Tang,Yi-Jun Xu
Harnessing the power of photoredox catalysis for the selective C(sp3)−H activation and oxidation of alkyl aromatics represents a cutting-edge approach to transforming petroleum-derived feedstocks into value-added C(sp3)−C(sp3) coupled chemicals. Herein, we delve into the photocatalytic process that involves the selective dehydrocoupling of ethylbenzene (EB) to access 2,3-diphenylbutane (DPB) alongside H2, employing three sulfur source-varied ZnIn2S4 (denoted as ZIS-x) catalysts. ZIS-TAA, with thioacetamide (TAA) as sulfur source, exhibits exceptional photocatalytic efficiency for DPB and H2 production. The results show the deficiency of charge carrier recombination centers in defect-poor ZIS-TAA is conducive to the separation of photogenerated charge. Additionally, the larger specific surface area and more surface functional groups provide abundant sites for reactant adsorption and activation, facilitating redox process aided by an ideal band-edge structure. This work illustrates a simple and cost-effective paradigm for designing semiconductor-based photocatalysts with tailored surface properties to enhance the efficiency of target cooperative photoredox reaction.
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高影响因子
Small
·
2021
·Vol. 17
·期 19
·2100082
·
IF 13.281
Jiatong Wei,Yanping Chen,Yanfu Ma,Xin Shi,Xiaoli Zhang,Chunjing Shi,Ming Hu,Jian Liu
Fischer-Tropsch synthesis (FTS) is an effective route to produce olefins, gasoline, diesel, and oxygenates from syngas (CO + H 2 ). However, it still remains a challenge for regulating the product distribution of FTS. Here, a series of Co/C sub-microreactors with precise designed nanoarchitectures are synthesized for selective syngas conversion. Through a combination of surface protection-assisted etching and following carbonization process, Co/C sub-microreactors with solid cube, double-shelled hollow box, and hollow box architectures, namely, Co/C-Cube, Co/C-DBox, Co/C-Box can be obtained. In FTS, comparing with solid Co/C-Cube, double-shelled hollow structured Co/C-DBox is inclined to grow long-chain hydrocarbon products, whereas hollow structured Co/C-Box avails the formation of short-chain hydrocarbon chemicals. Therefore, shape selective catalysis and controlled product distribution of FTS are realized by tuning the architectures of Co/C sub-microreactors. It is expected to fundamentally unravel the heterogeneous catalytic process via upfront designing and precisely regulating the architectures of micro/nanoreactors.
研究领域:
化学工程
·
材料科学
·
催化科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
研究领域:
材料科学
·
力学
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高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Chensheng Wang,Weifeng Li,Yumei Long
This work demonstrates a facile molten-salt synthesis of carbon-titanium nitride (C-TiN) nanocomposites. The C-TiN nanoparticles showed excellent electrocatalytic activity and thus were employed for the electrochemical determination of dopamine (DA). By using a differential pulse voltammetry (DPV) method, a C-TiN modified glassy carbon electrode (C-TiN/GCE) presented a high sensitivity (9620 µA·µM·cm −2 ) in the determination of DA and its detection limit (LOD) was 0.03 µM (S/N = 3). Moreover, the C-TiN/GCE sensor was used to detect DA in human serum, and acceptable recoveries were obtained.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Miao Zhang,Renzong Hu,Jiangwen Liu,Liuzhang Ouyang,Jun liu,Lichun Yang,Fang Fang,Min Zhu
Red phosphorus attracts significant interest for lithium-ion batteries due to its high theoretical capacity. Nevertheless, its low electronic conductivity and drastic volume change during cycling limit its further applications. In this study, we fabricate a novel AgP 2 /C nanocomposite by facile ball milling. The nanocomposite anode delivers a high reversible capacity of 785 mA h g −1 at 0.5 A g −1 after 100 cycles and an excellent rate capability with a reversible capacity of 605 mA h g −1 at10 A g −1 in half cells. This excellent electrochemical performance is attributed to the uniform dispersion of amorphous carbon and the synergistic effect of intermediate discharge/charge products. In addition, the LiCoO 2 ‖AgP 2 /C full cell exhibits a stable capacity with an operation potential of ∼2.8 V, indicating the commercial potential of this material in high rate lithium-ion batteries.
研究领域:
材料科学
·
电化学
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高影响因子
COMPOSITE INTERFACES
·
2019
·
IF 2.025
Xueyi Zhu,Shuling Shen,Zhihong Tang,Junhe Yang
Ti3+-doped TiO2@C nanorods were prepared through a facile hydrothermal process. Na2Ti3O7 ultralong nanotubes and glucose were used as TiO2 precursor and carbon (C) source, respectively. During hydrothermal treatment, the hydrolysis of Na2Ti3O7 and polymerization of glucose induced the formation of TiO2 nanorods with a coating of carbon complex. At the same time, a part of Ti4+ was reduced to Ti3+ due to the rich hydroxyl groups in glucose. After calcination, an ultrathin carbon shell was formed on the surface of TiO2 nanorods. In this prepared composite, Ti3+ self-doped TiO2 nanorods work as photosensitizer to harvest solar energy to generate electron-hole pairs, the tight-binding interface between TiO2 nanorods and carbon shell works as electron transportation path, and the ultrathin carbon shell acts as electrons trapped and accumulated site. Photocatalytic test results indicate that Ti3+-doped TiO2@C nanorods exhibit higher activity and stability than TiO2 for photodegradation of methylene blue under visible light.
研究领域:
材料科学
·
环境科学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Songlin Chang,Jiaxin Fei,Xiayan Jian,Youchao Song,Yingchen Xu,Yiwei Zhang
Developing simple and efficient synthesis methods for electrocatalysts is the key to advancing the process of electrochemical CO2 reduction reaction (CO2RR). In this study, we employ the simple hydrothermal method and modulate the pH to prepare the CuO-In(OH)3 heterostructure catalyst. It is found that the prepared lamellar CuO-In(OH)3-12 hetero-composite catalyst accelerates the reaction kinetics, provides more active sites, and strengthens the electronic interaction between Cu and In. The obtained catalyst achieves a notable Faradaic efficiency of 40.26% for C2 products at a current density of 18.5 mA cm-2. This work provides a new approach for the development of hetero-catalysts under synthetic regulation methods and different metal combination selections.
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