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Microwave Absorption Properties of Ni-Foped SiC Powders in the 2-18 GHz Frequency Range

Chinese Physics Letters 2011年第3期28卷 207-210页

作者： JIN Hai-Bo LI Dan CAO Mao-Sheng DOU Yan-Kun CHEN Tao WEN Bo simeon agathopoulos School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081 Department of Materials Science and Engineering University of IoanninaGR-45110 IoanninaGreece

Ni-doped SiC powder with improved dielectric and microwave absorption properties was prepared by selfpropagating high-temperature synthesis(SHS).The XRD analysis of the asynthesized powders suggests that Ni is accommodated in the sites of Si in the lattice of SiC,which shrinks in the presence of *** experimental results show an improvement in the dielectric properties of the Ni-doped SiC powder in the frequency range of 2-18 *** bandwidth of the reflection loss below-10 dB is broadened from 3.04(for pure SiC)to 4.56 GHz(for Ni-doped SiC),as well as the maximum reflection loss of produced powders from 13.34 to 22.57dB,indicating that Ni-doped SiC could be used as an effective microwave absorption material.

关键词： material powders dielectric

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Strategy to boost hydrolysis resistance and stabilize low infrared emissivity of ZrB_(2) via nanoscale LaF_(3) surface modification

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Rare Metals 2022年第12期41卷 4164-4175页

作者： Xue-Jing Xing Xian Jian Lin-Bo Zhang Hai-Peng Lu Zhong-Wei Zhang simeon agathopoulos Liang-Jun Yin Long-Jiang Deng School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu 611731China Laboratory of Energy Storage and New Energy Materials Technology Central Research InstituteDongfang Electric CorporationChengdu 611731China Department of Materials Science and Engineering University of Ioanninaloannina 45110Greece

Owing to its excellent high-temperature resistance and high conductivity,zirconium diboride(ZrB_(2)) has been applied as an infrared suppression ***,ZrB_(2)is susceptible to hydrolysis under high-moisture conditions and even under mild working *** improvement in the hydrophobicity of the ZrB_(2)surface effectively reduces wetting by water and suppresses hydrolysis reaction,particularly under high-temperature and high-moisture ***,we report a novel,easy,and highly reproducible method for producing a fully coated ZrB_(2)surface by developing a nanoscale hydrophobic layer of glassy LaF_(3)on the surface of ZrB_(2)powder particles in situ(i.e.,during the carbothermal synthesis of ZrB_(2)).Through the tests carried out at 200 ℃for 100-300 h in a hydrothermal reactor,the produced powders displayed remarkably high long-term hydrolysis resistance and pronounced chemical *** with treated ZrB_(2),ZrB_(2)@LaF_(3)remained lower infrared emissivity when continuously intensifying hydrolyzation *** results suggest that a nanoscale surface modification strategy can be applied to stabilize the infrared emissivity of ZrB_(2)in a water-oxygen coupling environment.

关键词： ZrB_(2) LaF_(3) Carbothermal reaction Hydrolysis resistance Hydrophobic behavior

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Self-supported porous heterostructure WC/WO_(3−x)ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

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Journal of Advanced Ceramics 2022年第8期11卷 1208-1221页

作者： Feihong WANG Binbin DONG Junwei WANG Nianwang KE Chuntian TAN Anding HUANG Yutong WU Luyuan HAO Liangjun YIN Xin XU Yuxi XIAN simeon agathopoulos CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Henan Key Laboratory of Special Protective MaterialsLuoyang Institute of Science and TechnologyLuoyang 471023China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China School of Energy Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Mechanical Behaviors and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China Department of Materials Science and Engineering University of IoanninaIoannina GR-45110Greece

Tungsten carbide(WC)-based materials are widely considered as the hydrogen evolution reaction(HER)process catalysts due to their“Pt-like”electronic ***,traditional powder electrodes have a high cost,and display problems related to the process itself and the poor stability over operation *** paper presented a self-supported asymmetric porous ceramic electrode with WO_(3-x)whiskers formed in situ on the walls of the finger-like holes and membrane surface,which was prepared by combining phase inversion tape-casting,pressureless sintering,and thermal treatment in a CO_(2) *** optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current *** specifically,it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec^(-1)at 10 mA·cm^(-2)in acidic and alkaline media,*** superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency,which was favored by the in situ developed WC/WO_(3-x)heterostructure and the oxygen vacancies.

关键词： hydrogen evolution reaction(HER) porous ceramic membrane WC/WO_(3−x)heterostructure self-supported electrode oxygen vacancies

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