Journal of Materials Chemistry A
·
2025
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IF 9.5
Xinghang Duan,Qiaolin Li,Tiantian Cao,Shengxiang Xiong,Gang Chen,Chengjun Dong,Hongtao Guan,Zongyou Yin
The development of advanced electromagnetic (EM) wave absorbers is crucial for applications in stealth technology and EM interference shielding. A major challenge in this field is achieving high absorption efficiency across a broad frequency range while maintaining lightweight and structurally robust materials. In this study, we successfully developed a precise and flexible synthesis strategy to prepare hollow C/Co/Mo2C cubes using Zn/Co(C4O4)(H2O)2 as a flexible template, which offers the advantages of simultaneous removal and easy control of metal Co content. The shell of the hollow cubes can be further optimized by changing the oxidizer content for polypyrrole (PPy). At optimum shell thickness and Co content, the C/Co/Mo2C-0.4 composites, featuring hollow but perforated structures, exhibit superior EM wave absorption properties, with a minimum reflection loss (RLmin) of −73.46 dB and an effective absorption bandwidth (EAB) of 5.20 GHz at 2.0 mm with 15 wt% filler. Detailed investigations reveal that the hollow C/Co/Mo2C-0.4 cubes provide polarization loss, conduction loss, magnetic loss, and optimal impedance matching characteristics, significantly enhancing EM wave absorption performance. This work offers a promising strategy for assembling multiple components into a hollow architecture, offering superior molybdenum carbide microwave absorbers.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng Tang,Xueying Zhao,Jiawei Du,Mang Li,Haining Qian,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In this study, hollow Co@SiO 2 @PPy composites with excellent electromagnetic wave (EMW) absorption performance were successfully synthesized. The monodisperse hollow Co microspheres were prepared using a solvent-thermal method. The microspheres were then coated with an SiO 2 layer by a modified Stöber method. Finally, the SiO 2 layer was surface-coated by polypyrrole (PPy) through in-situ polymerization to obtain Co@SiO 2 @PPy composite materials with hollow core–shell structures. The prepared CSP2 composite achieved a minimum reflection loss (RL min ) of −65.83 dB at 1.86 mm, demonstrating an effective absorption bandwidth (EAB) of 4.84 GHz. The CSP3 composite achieved a widest EAB (EAB max ) of 5.4 GHz at a thickness of 1.83 mm, while simultaneously maintaining the RL level at −50.70 dB. Additionally, it demonstrated an RL min value of −61.66 dB with a thickness as thin as 1.66 mm. The observed shift of FTIR absorption peaks by 20 cm −1 in the PPy ring provides compelling evidence for the involvement of multilayered structures in polarization loss. The SiO 2 layer not only enhances the interface polarization but also prevents corrosion of the Co core by acidic solutions. The exceptional EMW absorption characteristics can be attributed to the effective impedance matching and the combined effect of magnetic and dielectric losses.
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POLYMER
·
2024
·
IF 4.1
Dongwei Xu,Mingju Zhang,Chao Wang,Zhihao Shen,Mengfei Wang,Jie Zhang,Ziang Han,Luyao Li,Xuhai Xiong,Ping Chen
Conductive polymers materials with hollow micro/nanostructure due to their special electrical properties and corrosion resistance have potential applications in microwave absorption, especially in marine environment. Herein, one-dimensional hollow conductive polypyrrole microtubes (H-PPyM) were prepared by in-situ polymerization of pyrrole monomer with methyl orange (MO) as soft template and FeCl 3 as oxidant based on structural regulation strategy. The morphology and conductivity of H-PPyM can be easily controlled by adjusting the content proportion of MO. The results indicated that the surface morphology of polypyrrole changed from random granular to microtubular and the conductivity also gradually rose with the content increase of MO. When the content proportion of MO was 0.25 g, the obtained H-PPyM-0.25 composites possed notable microwave absorption capacity, simultaneously achieving ultrabroad effective absorption bandwidth (EAB, 6.7 GHz) and strong reflection loss value (RL, −33.6 dB) at a thickness of 2.6 mm with the filling content of only 10 wt%, respectively. Furthermore, the corresponding H-PPyM-0.25 products soaked in corrosive medium (3.5 wt% NaCl solution) for one month still displayed stable tubular hollow structure and excellent microwave absorption performance with RLmin of −43.8 dB and EAB of 6.2 GHz. The research results can not only help to understand the relationship among the morphology and microwave absorption of PPy, but also open a new avenue for preparing excellent seawater corrosion resistant microwave absorption materials.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Peng Tang,Jiawei Du,Mang Li,Xueying Zhao,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
Core–shell structures are commonly employed in microwave absorption (MA) materials due to their distinctive interfacial architecture. In this study, ferroferric oxide@polypyrrole (Fe3O4@PPy) nanocomposites with hollow core–shell structures were successfully synthesized for MA using a solvothermal process, followed by in situ polymerization. The minimum reflection loss (RLmin) frequency of the nanocomposites can be precisely controlled by adjusting the thickness of the PPy shell. The thickening of the PPy shell enhances the conduction loss of the nanocomposites, thus, enhancing the dielectric loss of the nanocomposites. The fabricated FP-170, FP-180 and FP-190 nanocomposites exhibit remarkable MA properties at low frequencies, with their RLmin reaching −63.82 dB, −84.92 dB, and −71.25 dB at 4.55 mm, 3.87 mm, and 2.64 mm, respectively. The maximum effective absorption bandwidth (EABmax) of FP-170 extends to 3.48 GHz at 2.39 mm, FP-180 extends to 4.20 GHz at 2.38 mm, and FP-190 extends to 4.96 GHz at 2.16 mm. The FP-200 nanocomposite, which has PPy shell thickness of 15 nm, exhibits exceptional radar stealth performance, with Radar Cross-Section (RCS) values below −17.68 dB·m2 within the range of −90° to 90°. Both simulation and experimental results prove that the hollow core–shell structured Fe3O4@PPy nanocomposite is an excellent candidate for MA applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Guangyu Fang,Xiaorui Ma,Rong Hu,Jiao Dai,Haoran Tian,Lin Li,Weilin Xu,Yonggang Yao,Jun Wan
Fiber-based energy storage devices present distinct advantages over rigid alternatives, particularly for flexible and wearable applications. However, achieving stable integration of electrochemically active materials with fiber substrates remains a significant challenge, especially for carbon fibers (CF), due to their inherent physical smoothness and chemical inertness make them prone to interfacial separation under repeated bending and deformation in practical applications. In this study, we employed a salt template-assisted vapor-phase polymerization method to achieve horizontally oriented growth of 2D conductive polymer complex on CF, thereby forming a bamboo sheath-like structure with a 2D juxtaposed ultrathin nanosheet-coated fiber interface (2D-JUN-FI). The skinned nanosheets on CF ensure maximized interfacial binding in the vertical interfaces through extensive surface coverage and hydrogen bonding interaction, while maintaining the structure integraty in the horizontal plane, thus resulting in both high mechanical robustness and electron mobility under static and dynamic deformations. The synthesized electrode of 2D polypyrrole and amorphous niobium oxide on CF composites (2D Ppy/a-Nb 2 O 5 /CF) demonstrates high specific capacity and an exceptionally long cycling life (88.06 % capacitance retention after 5000 cycles). This template-assisted horizontal growth of the 2D-JUN-FI skinned structure provides a novel approach for developing high-stability and long-life flexible energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xue Liu,Wei Yan,Jie Song,Hao Song,Wenmiao Chen,Yuexing Zhang,Yanli Chen
Enhancing the exposure of active sites and optimizing the electronic structure of the catalysts are indispensable for efficient catalyst design, yet remains challenging in the renewable energy field. Herein, a sequential pyrolyzing and phosphating approach for a well-designed GO/CoTPP gel precursor has been explored to prepare a Co-based carbon catalyst containing single-atom Co-N x and hollow Co 2 P active species (Co 2 P/Co-N-C) for multifunctional electrocatalytic reactions. Kirkendall effect occurring during the template-free one-pot phosphating approach induced the formation of the hollow Co 2 P structure in the catalyst, simultaneously optimizing the electron structure and allowing the active sites to be exposed to a greater extent. DFT calculations demonstrated that the Co 2 P and Co-N x structures enable Co 2 P/Co-N-C to have a suitable d-band center depending on the electron transfer from Co 2 P to Co-N x , which enhances the adsorption of O* and the dissociation of OH* in oxygen electrode reactions, thereby facilitates catalytic reactions. As a result, the Co 2 P/Co-N-C exhibits excellent trifunctional activity with a half-wave potential of 0.89 V in alkaline for oxygen reduction reaction (ORR), overpotentials of 330 mV for oxygen evolution reaction (OER) and 190 mV for hydrogen evolution reaction (HER), respectively, which are among the best results reported to date for Co-containing carbon-based catalysts. Furthermore, the flexible Zinc-air battery with Co 2 P/Co-N-C electrodes also demonstrates a high open circuit voltage of 1.35 V, which is applied to build the self-powered device for water splitting continuously. Our work provides a facile strategy to prepare high-performance trifunctional catalysts by morphology/structure control of metal-based NPs on carbon-based materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
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IF 18.5
Xi Wang,Keshuai Hu,Juanjuan Wang,Xue Han,Xiaopeng Li,Fan Xu,Yanping Cao,Conghua Lu
Dynamic oriented wrinkling especially on arbitrary film materials is highly desirable yet remains a great challenge. Here, fabrication of programmable aligned wrinkling patterns on different film/substrate systems via a laser-direct-writing (LDW) method is reported, regardless of photofunctionality and transparence of the target films. The key is related to smart introduction of photothermal materials (PTMs) into compliant substrates and even as an independent attachable/detachable layer assembled underneath the film/substrate systems. Experiments and theoretical modeling reveal that with the help of the photothermal effect of PTMs, in situ LDW-induced localized dynamic anisotropic stress field is responsible for the intriguing LDW path-parallel aligned wrinkling. Furthermore, dimensional analysis is carried out and explicit solutions quantifying the connection of wrinkling morphology parameters with the LDW conditions are derived for the first time, which enables theoretical pattern designing. It is highlighted that the attachable/detachable assembly strategy for the independent PTMs layer endows arbitrary film/substrate systems with on-demand photosensitivity when needed, which has been inaccessible previously. As demonstrated, these dynamic oriented wrinkling systems have found broad applications especially in smart soft photonics, e.g., information storage, anticounterfeiting, and responsive optical devices.
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INORGANIC CHEMISTRY
·
2024
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IF 4.3
Jinlong Liu,Ziyu Luo,Jiayun Wu,Dong Qian,Weixiong Liao,Geoffrey I. N. Waterhouse,Xiangxiong Chen
The oxygen reduction reaction (ORR) plays a vital role in many next-generation electrochemical energy conversion and storage devices, motivating the search for low-cost ORR electrocatalysts possessing high activity and excellent durability. In this work, we demonstrate that iron–cobalt phosphide (FeCoP) nanoparticles encapsulated in a N-doped carbon framework (FeCoP@NC) represent a very promising catalyst for the ORR in alkaline media. The core–shell structured FeCoP@NC catalyst offered outstanding ORR activity with a half-wave potential (E1/2) of 0.86 V vs reversible hydrogen electrode (RHE) and excellent stability in a 0.1 M KOH electrolyte, outperforming commercial Pt/C and many recently reported noble-metal-free ORR electrocatalysts. The superiority of FeCoP@NC as an ORR electrocatalyst relative to Pt/C was further verified in prototype zinc-air batteries (ZABs), with the aqueous and flexible ZABs prepared using FeCoP@NC offering excellent stability, impressive open circuit voltages (1.56 and 1.44 V, respectively), and high maximum power densities (183.5 and 69.7 mW cm–2, respectively). Density functional theory calculations revealed that encapsulating FeCoP nanoparticles in N-doped carbon shells resulted in favorable electron penetration effects, which synergistically regulated the adsorption/desorption of ORR intermediates for optimal ORR performance while also boosting the electronic conductivity. Our findings offer valuable new insights for rational design of transition metal phosphide-based catalysts for the ORR and other electrochemical applications.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18304-18312
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IF 10.7
Liuqian An,Jiaxiang Ma,Peizhi Wang,Aleksandr Kuchmizhak,Jinxin Yao,Hongbo Xu,Wei Wang
Thermal management of buildings consumes 51% of the world's energy use. Optimization of the energy use can be potentially achieved via daylight harvesting and radiative cooling approaches, yet their simultaneous utilization under static conditions is challenging due to opposite operation principles. Here, an in situ switchable photoselective polymer (PSP) material was prepared by sequential electrospinning of light-reflecting and light-absorbing layers made of contrasting polymer nanofibers. The as-prepared PSP material exhibited a high solar light reflectance of 97.7% and a high broadband emissivity of 94.9% resulting in a radiative cooling power of 111.1 W m−2. Such “cooling” state of the PSP film can be easily switched to a “heating” one via impregnation of an index matching liquid that suppresses scattering at the film–air interface and reduces the solar band reflectivity of the film. Thanks to the highly porous structure of the designed PSP film, its switching takes less than 5 min and allows an integrated solar absorbance of ∼95.6% to be achieved, resulting in an estimated heating power of 781.6 W m−2. Performed numerical calculations further supported the high potential of the developed PSP film for thermal management of buildings located at high latitudes with energy savings up to 89.74 GJ m−2 per year and reduced CO2 emissions down to 21.69 t.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Honglei Shuai,Renzhi Liu,Wenxuan Li,Xiaojian Yang,Hao Zhang,Yongping Gao,Hui Lu,Kejing Huang
Antimony selenide (Sb 2 Se 3 ) has been considered as a prospective material for sodium-ion batteries (SIBs) because of its large theoretical capacity. Whereas, grievous volume expansion caused by the conversion-alloying reaction leads to fast capacity decay and inferior cycle stability. Herein, the confined Sb 2 Se 3 nanorods in nitrogen-doped carbon (Sb 2 Se 3 /NC) with interfacial chemical bond is designed to further enhance sodium storage properties of Sb 2 Se 3 . The robust enhancing effect of interfacial Sb O C bonds can significantly promote electron transfer, Na + ions diffusion kinetics and alloying reaction reversibility, combining the synergistic effect of the unique confinement structure of N -doped carbon shells can efficiently alleviate the volume change to ensure the structural integrity. Moreover, in-situ X-ray diffraction reveals intercalation/de-intercalation, conversion/reversed conversion reaction and alloying/de-alloying reaction mechanisms, and the kinetics analysis demonstrates the diffusion-controlled to contribute high capacity. As a result, Sb 2 Se 3 /NC anode delivers a high reversible capacity of 612.6 mAh/g at 0.1 A/g with a retentive specific capacity of 471.4 mAh/g after 1000 cycles, and long-cycle durability of over 2000 cycle with the reversible capacities of 371.1 and 297.3 mAh/g at 1 and 2 A/g are achieved, respectively, and an good rate capability. This distinctive interfacial chemical bonds and confinement effect design shows potential applications in the improved conversion/alloying-type materials for SIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jiaxue Liang,Hang Qi,Feng Zhu,Shuqi Chen,Bohua Liu,Chongling Sun,Yanyan Wang
Real-time monitoring the drugs penetration into brain is crucial for clinical therapy of neurodegenerative diseases. In this study, a Blood-Brain Barrier-electrochemical sensing (BBB-ES) platform combining BBB on chip model and electrochemical sensing system was proposed, which facilitated stable BBB growth under fluidic conditions and realized real-time detection of L-Dopa across the BBB. Based on this system, the effects of fluid force on the cell morphology, skeleton arrangement and tight junction protein ZO-1 of BBB growth were evaluated, it was verified that the fluid force promote cell rearrangement. Additionally, L-Dopa detecting performance was optimized by modifying SWNTs-AuNPs-PPy/Tyr(Single-Walled Carbon Nanotubes-Au Nanoparticles-Polypyrrole/Tyrosinase) on electrochemical electrode, which showed a wide linear response range of 10–500 μM and excellent selectivity toward L-Dopa. The integrated BBB-ES system was finally applied to real-time monitor the penetration process of L-Dopa through the BBB, it was proved that the penetration of L-Dopa increased with the increase of flow rate and time, and finding that L-Dopa was delivered by passive diffusion without disrupting the integrity of BBB. Based on these findings, the system can be used to monitor the real-time process of different drugs penetrating BBB and even different organ barriers, which also provide the possibility to solve the clinical demand for drugs screen.
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Analytical Methods
·
2024
·
IF 2.7
Yefeng Deng,Chao Zhang,Lianpeng Lv,Kun Wang,Feng Liu,Yang Zhou,Zhiqin Peng,Bing Wang
Silk is a symbol of ancient Chinese civilization that has made an indelible contribution to the development of world civilization. However, because ancient artifacts are often contaminated or degraded, it is difficult to detect the presence of silk therein, and the true origin of silk thus remains a mystery. Therefore, this work presents a flexible pressure immunosensor that was designed based on 3D polypyrrole (PPy) foams for the trace detection of silk fibroin at archaeological sites. Initially, silk fibroin (SF) was conjugated with antibody-functionalized copper oxide nanoparticles (CuO NPs) and carboxylated magnetic beads (MBs) to form a sandwich immune complex. Then, the sandwich immune complex was added to hydrogen peroxide (H2O2) by magnetic separation to catalyse the generation of oxygen (O2), which converted the antigen–antibody specific recognition signal to gas pressure. As the pressure within the device increases, the 3D PPy foam, as the sensing layer resistance was 150 Ω, undergoes extrusion and deformation. This deformation leads to alterations in the foam resistance. The flexible pressure immunosensor can sensitively monitor the change in electrical resistance in the system and quantitatively detect silk fibroin. With optimization, the flexible pressure immunosensor demonstrates a dynamic range of operation spanning from 10 ng mL−1 to 100 μg mL−1, exhibiting a remarkable detection limit of 10.58 ng mL−1 specifically for silk fibroin. Notably, this immunosensor surpasses enzyme-linked immunosorbent assay (ELISA) in terms of superior reproducibility, specificity, and accuracy. Therefore, this application provides a new method and technical support for silk detection.
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危险品化学品经营许可证（带存储）