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Nano-Micro Letters 2021年第12期13卷 383-415页

作者： Honghong Zhao Fengyuan Wang Liru Cui Xianzhu Xu xijiang han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China

Magnetic carbon-based composites are the most attractive candidates for electromagnetic(EM)absorption because they can terminate the propagation of surplus EM waves in space by interacting with both electric and magnetic ***-organic frameworks(MOFs)have demonstrated their great potential as sacrificing precursors of magnetic metals/carbon composites,because they provide a good platform to achieve high dispersion of magnetic nanoparticles in carbon ***,the chemical composition and microstructure of these composites are always highly dependent on their precursors and cannot promise an optimal EM state favorable for EM absorption,which more or less discount the superiority of MOFs-derived *** is hence of great importance to develop some accompanied methods that can regulate EM properties of MOFs-derived magnetic carbon-based composites e *** review comprehensively introduces recent advancements on EM absorption enhancement in MOFs-derived magnetic carbon-based composites and some available strategies *** addition,some challenges and prospects are also proposed to indicate the pending issues on performance breakthrough and mechanism exploration in the related field.

关键词： Magnetic carbon-based composites Metal–organic frameworks Composition optimization Microstructure design EM absorption enhancement

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

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Nano-Micro Letters 2020年第11期12卷 141-153页

作者： Yunlong Lian Binhua han Dawei Liu Yahui Wang Honghong Zhao Ping Xu xijiang han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China

Carbides/carbon composites are emerging as a new kind of binary dielectric systems with good microwave absorption ***,we obtain a series of tungsten carbide/carbon composites through a simple solvent-free strategy,where the solid mixture of dicyandiamide(DCA)and ammonium metatungstate(AM)is employed as the *** cubic WC1-x nanoparticles(3-4 nm)are in situ generated and uniformly dispersed on carbon *** configuration overcomes some disadvantages of conventional carbides/carbon composites and is greatly helpful for electromagnetic *** is found that the weight ratio of DCA to AM can regulate chemical composition of these composites,while less impact on the average size of WC1-x *** the increase in carbon nanosheets,the relative complex permittivity and dielectric loss ability are constantly enhanced through conductive loss and polarization *** different dielectric properties endow these composites with distinguishable attenuation ability and impedance *** DCA/AM weight ratio is 6.0,the optimized composite can produce good microwave absorption performance,whose strongest reflection loss intensity reaches up to-55.6 dB at 17.5 GHz and qualified absorption bandwidth covers 3.6-18.0 GHz by manipulating the thickness from 1.0 to 5.0 *** a performance is superior to many conventional carbides/carbon composites.

关键词： Solvent-free synthesis Tungsten carbide/carbon composite Ultrafine nanoparticle Microwave absorption Dielectric loss

Advances in core–shell engineering of carbon-based composites for electromagnetic wave absorption

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Nano Research 2022年第10期15卷 9410-9439页

作者： Lixue Gai Honghong Zhao Fengyuan Wang Pan Wang Yonglei Liu xijiang han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Electromagnetic(EM)absorption is paving the way to overcome the challenges related to conventional shielding strategy against EM pollution through sustainable energy *** characteristic functional media that can interact with electric or magnetic field branch,EM wave absorption materials(EWAMs)have received extensive attention and realized considerable development in the past two decades,where carbon-based composites are always considered as promising candidates for high-performance EMAWs due to their synergetic loss mechanism as well as diversified composition and microstructure *** progress indicates that there is more and more interest in the fabrication of carbon-based composites with unique core–shell *** one hand,core–shell configuration usually ensures good chemical homogeneity of final products and provides some positive protections for the components with susceptibility to corrosion,on the other hand,it creates enough heterogeneous interfaces between different EM components,which may bring enhanced polarization effect and intensify the consumption of EM *** this review,we firstly introduce EM wave absorption theory,and then highlight the advances of core–shell engineering in carbonbased composites in terms of built-in carbon cores and built-out carbon ***,we also show some special core–shell carbon-based composites,including carbon/carbon composites,assembled composites,and decorated *** analyzing EM absorption performance of some representative composites,we further propose some challenges and perspectives on the development of core–shell carbon-based composites.

关键词： carbon-based composites core-shell configuration synergetic effect interfacial polarization electromagnetic(EM)absorption performance

Conjugated polymer-mediated synthesis of sulfur- and nitrogen-doped carbon nanotubes as efficient anode materials for sodium ion batteries

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Nano Research 2018年第5期11卷 2573-2585页

作者： Yanzhen He xijiang han Yunchen Du Bo Song Bin Zhang Wei Zhang Ping Xu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China

Heteroatom-doped carbon nanomaterials have attracted significant attention as anode materials for sodium-ion batteries （SIBs）. Herein, we demonstrate a conjugated polymer-mediated synthesis of sulfur and nitrogen co-doped carbon nanotubes （S/N-CT） via the carbonization of sulfur-containing polyaniline （PANI） nanotubes. It is found that the carbonization technique greatly influences the structural features and thus the Na-storage behavior of the S/N-CT materials. The carbon nanotubes developed using a two-step carbonization process （heating at 400℃ and then at 900℃） exhibit a high specific surface area, enlarged interlayer distance, small charge transfer resistance, enhanced reaction kinetics, as well as a large number of defects and active sites; further, they exhibit a high reversible capacity of 340 mAh·g^-1 at 0.1 A·g^-1 and a remarkable cycling stability with a capacity of 141 mAh·g^-1 at 5 A·g^-1 （94% retention after 3,000 cydes）. Direct carbonization of conjugated polymers with a specific morphology is an eco-friendly and low-cost technique for the synthesis of dual atom-doped carbon nanomaterials for application in energy devices. However, the carbonization process should be carefully controlled in order to better tune the structure-property relationship.

关键词： sodium ion battery conjugated polymer carbon nanotube heteroatom doping

Hollow FeCo-FeCoP@C nanocubes embedded in nitrogen-doped carbon nanocages for efficient overall water splitting

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Journal of Energy Chemistry 2021年第2期30卷 1-8,I0001页

作者： Yuzhi Li Siwei Li Jing Hu Yuanyuan Zhang Yuchen Du xijiang han Xi Liu Ping Xu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Syncat@Beijing Synfuels China Technology CompanyLtdBeijing 101407China School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Guangdong Provincial Key Laboratory of Energy Materials for Electric Power Shenzhen 518055GuangdongChina

Designing readily available and highly active electrocatalysts for water splitting is essential for renewable energy *** we present the construction of FeCo-FeCoP@C hollow nanocubes encapsulated in nitrogen-doped carbon nanocages(FeCo-FeCoP@C@NCCs) through controlled carbonization and subsequent phosphorization of a Prussian blue *** stronger electronic interaction and hollow structure,the as-obtained FeCo-FeCoP@C@NCCs material requires small overpotentials of 91 mV and280 mV to deliver 10 mA cm^(-2) in 1 M KOH toward hydrogen and oxygen evolution,*** importantly,applying this material for overall water splitting,it only requires 1.64 V to afford10 mA cm^(-2) and exhibits impressively durability over 40 h without obvious performance *** present approach inspires potentials for the controllable synthesis of multi-component catalysts for practical applications.

关键词： Electrocatalysts Oxygen evolution reaction Overall water splitting Hydrogen evolution reaction Metal phosphide

Reduced graphene oxide aerogel decorated with Mo_(2)C nanoparticles toward multifunctional properties of hydrophobicity,thermal insulation and microwave absorption

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 536-547页

作者： Yahui Wang Minghui Zhang Xuesong Deng Zhigang Li Zongsheng Chen Jiaming Shi xijiang han Yunchen Du Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province National University of Defense TechnologyHefei 230037China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei 230037China Anhui Provincial Laboratory of Advanced Laser Technology National University of Defense TechnologyHefei 230037China

Reduced graphene oxide(rGO)aerogels are emerging as very attractive scaffolds for high-performance electromagnetic wave absorption materials(EWAMs)due to their intrinsic conductive networks and intricate interior microstructure,as well as good compatibility with other electromagnetic(EM)***,we realized the decoration of rGO aerogel with Mo_(2)C nanoparticles by sequential hydrothermal assembly,freeze-drying,and high-temperature *** show that Mo_(2)C nanoparticle loading can be easily controlled by the ammonium molybdate to glucose molar *** hydrophobicity and thermal insulation of the rGO aerogel are effectively improved upon the introduction of Mo_(2)C nanoparticles,and more importantly,these nanoparticles regulate the EM properties of the rGO aerogel to a large *** more Mo_(2)C nanoparticles may decrease the overall attenuation ability of the rGO aerogel,they bring much better impedance *** a molar ratio of 1:1,a desirable balance between attenuation ability and impedance matching is *** this context,the Mo_(2)C/r GO aerogel displays strong reflection loss and broad response bandwidth,even with a small applied thickness(1.7 mm)and low filler loading(9.0wt%).The positive effects of Mo_(2)C nanoparticles on multifunctional properties may render Mo_(2)C/r GO aerogels promising candidates for high-performance EWAMs under harsh conditions.

关键词： Mo_(2)C/reduced graphene oxide aerogel microwave absorption dielectric loss hydrophobicity thermal insulation

Polymer-bubbling for one-step synthesis of three-dimensional cobalt/carbon foams against electromagnetic pollution

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Journal of Materials Science & Technology 2021年第34期93卷 7-16页

作者： Fengyuan Wang Ping Xu Ning Shi Liru Cui Yahui Wang Dawei Liu Honghong Zhao xijiang han Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

Constructing three-dimensional(3D)foam-like structure in magnetic metal/carbon composites is regarded as a promising pathway to reinforce their electromagnetic(EM)***,a nitrateassisted polymer-bubbling strategy is reported for the synthesis of Co/carbon foams,which is simply accomplished by direct pyrolyzing the mixture of polyvinylpyrrolidone(PVP)and cobalt nitrate hexahydrate(Co(NO_(3))_(2)·6 H_(2) O).Co(NO_(3))_(2)·6H_(2)O not only plays as the source of Co nanoparticles,but also accounts for the formation of 3D microstructure through releasing *** manipulating the weight ratio of Co(NO_(3))_(2)·6H_(2)O to PVP,the chemical composition,microstructure,and EM properties of these composites can be easily *** the weight ratio reaches 1.5,the resultant composite displays good microwave absorption performance,whose reflection loss intensity and effective absorption bandwidth are superior to those of many common Co/C *** analysis reveals that such architecture is greatly helpful to establish cross-linked conductive networks in the wax matrix,resulting in powerful dielectric loss under low absorber ***,3D microstructure is also beneficial for multiple reflections that equal to extend the transmission path of incident EM *** synthesis strategy and desirable properties of these magnetic carbon foams may render them as the low-cost substitute of 3D graphene for the application against EM pollution.

关键词： Polymer-bubbling Three-dimensional foams Co/C composites Electromagnetic pollution Microwave absorption

Trace Residue Analysis of the Herbicide Imazethapyr in Soil by Gas Chromatography-Nitrogen/Phosphorous Detector

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Journal of Northeast Agricultural University(English Edition) 1997年第1期4卷 73-77页

作者： Xiang Wensheng, Su Shaoquan, Wu Yongqing and han xijiang (Northeast Agricultural University, Harbin 150030, PRC)

A gas chromatographic method for determining the trace residue of imazethapyr {(±)-2-[4,5-dihydro-4-methtyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ehtyl-3-pyridinecarboxylic acid} in soil was described in this paper. The soil samples were extracted by shaking with 0.5 mol·L -1 sodium hydroxide solution. The aqueous extract was acidified with hydrocholric acid to adjust the pH to 2.0 to precipitate humic acids, then was extracted with dichloromethane. The organic extract was dried with anhydrous sodium sulfate and was concentrated. After florisil cleanup, and imazethapyr is derivatized with trimethylanilinium hydroxide (TMAH). Methylated imazethapyr was analyzed by gas chromatography with a nitrogen-phosphorous dtector. The recovery of imazethapyr from soil samples are over 80%, the experimental detection limit of the method is 5ng·g -1 .

关键词： imazethapyr residue gas chromatography

Compositional and Hollow Engineering of Silicon Carbide/Carbon Microspheres as High-Performance Microwave Absorbing Materials with Good Environmental Tolerance

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Nano-Micro Letters 2024年第9期16卷 128-146页

作者： Lixue Gai Yahui Wang Pan Wan Shuping Yu Yongzheng Chen xijiang han Ping Xu Yunchen Du MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China Anhui Provincial Laboratory of Advanced Laser Technology College of Electronic EngineeringNational University of Defense TechnologyHefei 230037People’s Republic of China

Microwave absorbing materials(MAMs)characterized by high absorption efficiency and good environmental tolerance are highly desirable in practical *** silicon carbide and carbon are considered as stable MAMs under some rigorous conditions,while their composites still fail to produce satisfactory microwave absorption performance regardless of the improvements as compared with the ***,we have successfully implemented compositional and structural engineering to fabricate hollow Si C/C microspheres with controllable *** simultaneous modulation on dielectric properties and impedance matching can be easily achieved as the change in the composition of these *** formation of hollow structure not only favors lightweight feature,but also generates considerable contribution to microwave attenuation *** the synergistic effect of composition and structure,the optimized SiC/C composite exhibits excellent performance,whose the strongest reflection loss intensity and broadest effective absorption reach-60.8 dB and 5.1 GHz,respectively,and its microwave absorption properties are actually superior to those of most SiC/C composites in previous *** addition,the stability tests of microwave absorption capacity after exposure to harsh conditions and Radar Cross Section simulation data demonstrate that hollow SiC/C microspheres from compositional and structural optimization have a bright prospect in practical applications.

关键词： SiC/C composites Compositional engineering Hollow engineering Microwave absorption Environmental tolerance

A new strategy for carbon-based composites as promising microwave absorbers

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A new strategy for carbon-based composites as promising micr...