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Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N‑RGO for Boosting Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang Yuefeng Yan Zhen Wang Guansheng Ma Dechang Jia Xiaoxiao Huang Yu Zhou State key laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT key laboratory of advanced Structural‑Functional Integration Materials&Green manufacturing technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–N-RGO)was prepared by embedding a series of single metal atoms M–N_(4) sites(M=Mn,Fe,Co,Ni,Cu,Zn,Nb,Cd,and Sn)in RGO using an N-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–N-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–N_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-N-RGO Dipole polarization Conduction loss Impedance matching

High-temperature-tolerant flexible supercapacitors: Gel polymer electrolytes and electrode materials

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Journal of Energy Chemistry 2025年第1期100卷 426-457页

作者： Chong Peng Xinyi Huang Mingwei Zhao Shuling Liao Quanhong Yang Nianjun Yang Siyu Yu School of Chemistry & Chemical Engineering Southwest University Nanoyang Group Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage School of Chemical Engineering and Technology and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Department of Chemistry & IMO-IMOMEC Hasselt University

The development of flexible supercapacitors(FSCs) capable of operating at high temperatures is crucial for expanding the application areas and operating conditions of supercapacitors. Gel polymer electrolytes and electrode materials stand as two key components that significantly impact the efficacy of hightemperature-tolerant FSCs(HT-FSCs). They should not only exhibit high electrochemical performance and excellent flexibility, but also withstand intense thermal stress. Considerable efforts have been devoted to enhancing their thermal stability while maintaining high electrochemical and mechanical performance. In this review, the fundamentals of HT-FSCs are outlined. A comprehensive overview of state-of-the-art progress and achievements in HT-FSCs, with a focus on thermally stable gel polymer electrolytes and electrode materials is provided. Finally, challenges and future perspectives regarding HT-FSCs are discussed, alongside strategies for elevating operational temperatures and *** review offers both theoretical foundations and practical guidelines for designing and manufacturing HT-FSCs, further promoting their widespread adoption across diverse fields.

关键词： Flexible supercapacitors High-temperature tolerance Gel polymer electrolytes Electrode materials

Conversion-type cathode materials for high energy density solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期 409-425页

作者： Yuhao Ma Shihong Qing Hongyu Liu Chuntao Ma Yuan Yu Chuang Yu Liping Wang School of Materials and Energy University of Electronic Science and Technology of China Zhejiang Provincial key laboratory of Fiber Materials and manufacturing technology Zhejiang Sci-Tech University State key laboratory of advanced Electromagnetic Engineering and technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

Solid-state lithium batteries （SSLBs） are regarded as an essential growth path in energy storage systems due to their excellent safety and high energy *** particular,SSLBs using conversion-type cathode materials have received widespread attention because of their high theoretical energy densities,low cost,and *** the great progress in research and development of SSLBs based on conversiontype cathodes,their practical applications still face challenges such as blocked ionic-electronic migration pathways,huge volume change,interfacial incompatibility,and expensive processing *** review focuses on the advantages and critical issues of coupling conversion-type cathodes with solid-state electrolytes （SSEs）,as well as state-of-the-art progress in various promising cathodes （e.g.,FeS2,CuS,FeF3,FeF2,and S） in ***,representative research on conversion-type solid-state full cells is discussed to offer enlightenment for their practical ***,the energy density exhibited by the S cathode stands out impressively,while sulfide SSEs and halide SSEs have demonstrated immense potential for coupling with conversion-type ***,perspectives on conversion-type cathodes are provided at the material,interface,composite electrode,and battery levels,with a view to accelerating the development of conversion-type cathodes for high-energy–density SSLBs.

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Constructing nitrided aluminum metal skeleton to improve the reversibility and cyclicity of Si film electrode

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Progress in Natural Science:Materials International 2023年第6期33卷 789-796页

作者： Jiali Tong Tingfeng Guan Qilin Tong Yan Cheng Zhaozhe Yu Guilin University of Electronic technology Guangxi key laboratory of manufacturing Systems and advanced manufacturing technology

Silicon is a promising anode material for lithium-ion batteries(LIBs) due to its high theoretical capacity, low discharge potential, environmental friendliness and cost-effectiveness. However, its low conductivity, high volume variation and poor cycling performance hamper its practical application. Herein, we prepare Si-Al(Al N)composite film anodes containing a nitrided aluminum metal conductive skeleton. The Al(Al N) creates a multiphase interface, buffers the volume expansion of the electrode, and also plays a role in conducting electricity and supporting the electrode structure. As a result, the Si-Al(Al N) electrode exhibits excellent performance with a high initial coulombic efficiency of 86 %, an outstanding cycling stability of roughly 1955 m Ah g-1after 200 cycles at420 m A g-1and retains 916 m Ah g-1after 300 cycles even at 4200 m A g-1(the capacity retention rate of 83 %).This work provides an effective method for adjusting anode performance with greater freedom.

关键词： Silicon film anode Nitrided aluminum metal conducting skeleton Cycling stability Lithium-ion battery

Loading direction-dependent shear behavior at different temperatures of single-layer chiral graphene sheets

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Acta Mechanica Sinica 2018年第3期34卷 542-548页

作者： Yang Zhao Shuhong Dong Peishi Yu Junhua Zhao Jiangsu key laboratory of advanced Food manufacturing Equipment and technology Jiangnan University

The loading direction-dependent shear behavior of single-layer chiral graphene sheets at different temperatures is studied by molecular dynamics （MD） simulations. Our results show that the shear properties （such as shear stress-strain curves, buckling strains, and failure strains） of chiral graphene sheets strongly depend on the loading direction due to the structural asymmetry. The maximum values of both the critical buckling shear strain and the failure strain under positive shear deformation can be around 1.4 times higher than those under negative shear deformation. For a given chiral graphene sheet, both its failure strain and failure stress decrease with increasing temperature. In particular, the amplitude to wavelength ratio of wrinkles for different chiral graphene sheets under shear deformation using present MD simulations agrees well with that from the existing theory. These findings provide physical insights into the origins of the loading direction-dependent shear behavior of chiral graphene sheets and their potential applications in nanodevices.

关键词： Chiral grapheme Shear behavior Buckling strain Wrinkles

Synthesis and high temperature thermoelectric transport properties of Si-based type-Ⅰ clathrates

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Chinese Physics B 2009年第7期18卷 3084-3089页

作者：邓书康唐新峰唐润生 Education Ministry key laboratory of Renewable Energy advanced Materials and manufacturing technology Yunnan Normal University State key laboratory of advanced technology for Materials Synthesis and Processing Wuhan University of Technology

N-type Si-based type-Ⅰ clathrates with different Ga content were synthesized by combining the solid-state reaction method,melting method and spark plasma sintering （SPS） *** effects of Ga composition on high temperature thermoelectric transport properties were *** results show that at room temperature,the carrier concentration decreases, while the carrier mobility increases slightly with increasing Ga *** Seebeck coefficient increases with increasing Ga content. Among all the samples,Ba7.93Ga17.13Si28.72exhibits higher Seebeck coefficient than the others and reaches -135μV·K^-1 at 1000 *** sample prepared by this method exhibits very high electrical conductivity,and reaches 1.95x 10^5 S·m^-1 for Ba8.01Ga16.61Si28.93 at room *** thermal conductivity of all samples is almost temperature independent in the temperature range of 300-1000 K,indicating the behaviour of a typical *** maximum ZT value of 0.75 is obtained at 1000 K for the compound Ba7.93Ga17.13Si28.72.

关键词： type-Ⅰ clathrate thermoelectric materials synthesis

Optimum design and preliminary experiments of a novel parallel end traction apparatus for upper-limb rehabilitation

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Frontiers of Mechanical Engineering 2021年第4期16卷 726-746页

作者： Shiping ZUO Jianfeng LI Mingjie DONG Guotong LI Yu ZHOU Beijing key laboratory of advanced manufacturing technology Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

Robot-assisted technology has been increasingly employed in the therapy of post stroke patients to deliver high-quality treatment and alleviate therapists5 *** paper introduces a novel parallel end traction apparatus(PETA)to supplement equipment *** the appearance and performance of the PETA,two types of special five-bar linkage mechanisms are selected as the potential configurations of the actuation execution unit because of their compact arrangement and parallel *** analysis of each mechanism,i.e.,position solutions and Jacobian matrix,is carried ***,a comparative study between the two mechanisms is *** the established source of nondimensional parameter synthesis,the singularity,maximum continuous workspace,and performance variation trends are *** on the evaluation results,the final scheme with determined configuration and corresponding near-optimized non-dimensional parameters is ***,a prototype is *** adding a lockable translational degree of freedom in the vertical direction,the PETA can provide 2D planar exercise and 3D spatial ***,a control system is developed for passive exercise mode based on the derived inverse position solution,and preliminary experiments are performed to verify the applicability of the PETA.

关键词： parallel mechanism upper-limb rehabilitation singularity and workspace analyses performance evaluation optimum design

Applications of sum-frequency generation vibrational spectroscopy in friction interface

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Friction 2022年第2期10卷 179-199页

作者： Zhifeng LIU Mengmeng LIU Caixia ZHANG Hongy an CHU Liran MA Qiang CHENG Hongyun CAI Junmin CHEN Institute of advanced manufacturing and Intelligent technology Beijing Universityof Technology'Beijing 100124China State key laboratory of Tribology' Tsinghua University.Beijing 100084China Beijing key Laboratory'of Advanced Manufacturing Technology'Beijing University'of Technology'Beijing 100124China

Sum-frequency generation(SFG)vibrational spectroscopy is a second-order nonlinear optical spectroscopy *** to its interfacial selectivity,SFG vibrational spectroscopy can provide interfacial molecular information,such as molecular orientations and order,which can be obtained directly,or molecular density,which can be acquired *** molecular behaviors are considered the basic factors for determining the tribological properties of ***,owing to its ability to detect the molecular behavior in buried interfaces in situ and in real time,SFG vibrational spectroscopy has become one of the most appealing technologies for characterizing mechanisms at friction *** paper briefly introduces the development of SFG vibrational spectroscopy and the essential theoretical background,focusing on its application in friction and lubrication interfaces,including film-based,complex oil-based,and water-based lubricating ***-time detection using SFG promotes the nondestructive investigation of molecular structures of friction interfaces in situ with submonolayer interface sensitivity,enabling the investigation of friction *** review provides guidance on using SFG to conduct friction analysis,thereby widening the applicability of SFG vibrational spectroscopy.

关键词： SFG vibrational spectroscopy film-based lubricating systems complex oil-based lubricating systems water-based lubricating systems

Nonlinear Impact Damage Evolution of Charpy Type and Analysis of Its key Influencing Factors

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 254-264页

作者： Jianfeng Mao Qian Xu Jiadong Yang Chi Cao Dasheng Wang Fengping Zhong Mingya Chen Institute of Process Equipment and Control Engineering Zhejiang University of TechnologyHangzhou 310032China taizhou key laboratory of advanced manufacturing technology Taizhou InstituteZhejiang University of TechnologyTaizhou 318014China State key laboratory of Nuclear Power Safety Monitoring technology and Equipment Shenzhen 518172China Zhejiang Academy of Special Equipment Science Hangzhou 310020China Suzhou Nuclear Power Research Institute Suzhou 215004China

The current research of Charpy impact mainly focuses on obtaining the ductile brittle transition temperature of materials by *** with experiments,numerical simulation can study many problems with harsh ***,there are still few studies on the influence of geometric factors such as side *** this paper,the geometry of standard Charpy impact test is *** with different widths and side grooves are *** finite element model of Charpy impact was established by ABAQUS *** test results and simulation results to verify each *** effects of sample width,side groove depth and side groove bottom fillet on the impact fracture resistance of the sample were *** results show that the specimen width is positively correlated with the impact toughness of the *** side groove greatly reduces the impact toughness of the material;the toughness of side groove decreases with the increase of depth;the fracture toughness of side groove decreases with the increase of fillet at the bottom of side *** proportion of toughness energy to impact energy of samples was *** results show that the toughness energy accounts for about 70%of the impact energy of the sample,which has little to do with the geometric characteristics of the *** study presents a reliable method for studying Charpy impact *** influence of geometric parameters is obtained,which provides a reference method for the study of impact toughness of high toughness materials.

关键词： Johnson-Cook model Impact toughness Charpy impact