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multidimensional hollow SiO_(2)/C nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

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Nano Research 2024年第8期17卷 7301-7314页

作者： Chen Han Qi Zheng Juncheng Jin Jiajia Zhang Wen-Qiang Cao Kun Xiang Min Zhang Mao-Sheng Cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/C(Ni-SiO_(2)/C)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/C can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/C ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/C nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 300 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/C nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

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multidimensional network of polypyrrole nanotubes loaded with ZIF-67 to construct multiple proton transport channels in composite proton exchange membranes for fuel cells

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Journal of Materials Science & Technology 2023年第21期152卷 75-85页

作者： Jie Yang Jin Lin Shiqi Sun Xue Li Lei Liu Chao Wang Advanced Energy Materials and Systems Institute North University of ChinaTaiyuan 030051China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Due to the designability of their proton transport channels,high-performance long-lasting composite proton exchange membranes(PEMs)are currently the subject of extensive ***,the compatibility and channel order of the internal components of the composite membranes are still *** this work,hollow polypyrrole(PPy)nanotube structures were obtained to provide a nitrogen source and to act as a skeleton to confine and separate cobalt nanoparticles on the surface of PPy ***,zeolitic imidazolate framework material-67(ZIF-67)was attached to the *** using this method,PPy@ZIF-67 filler can minimize the particle size and inhibit Co^(2+)ions from aggregating,thus constructing a reasonably distributed transport channel and improving the proton transport *** a result,the synthesized polymer nanotubes loaded metal-organic framework(MOF)nanofiber network can enhance the physicochemical properties and stability of the membrane by providing a more extensive interfacial *** addition,the composite membrane has excellent ionic conductivity and power density,reaching 233.7 mS cm^(–1) and 837 mW cm^(–2) at 80℃ and 100%*** indicates that the nanofibrous MOF structure not only improves the compatibility with the substrate but also provides sufficient leap points for proton transport via the interfacial conduction pathway between the PPy@ZIF-67 filler and the substrate,thus allowing the resulting composite membrane to facilitate proton transfer via the Vehicle and Grotthuss mechanisms synergistically.

关键词： multidimensional structure Composite proton exchange membrane Nanofiber ion channels Fuel cells

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