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Distribution pattern of acoustic and streaming field during multi-source ultrasonic melt treatment process

China Foundry 2023年第5期20卷 452-460页

作者： Xiao-gang Fang Qi Wei Tian-yang Zhang Ji-guang Liu You-wen Yang Shu-lin Lü Shu-sen Wu Yi-qing Chen School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Engineering Research Center of High-Performance Copper Alloy Materials and Processing Ministry of EducationHefei 230009China State Key Laboratory of Material Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The ultrasonic melt treatment(UMT)is widely used in the fields of casting and ***,there are certain drawbacks associated with the conventional process of single-source ultrasonic(SSU)treatment,such as the fast attenuation of energy and limited range of *** this study,the propagation models of SSU and four-source ultrasonic(FSU)in Al melt were respectively established,and the distribution patterns of acoustic and streaming field during the ultrasonic treatment process were investigated by numerical simulation and physical *** simulated results show that the effective cavitation zone is mainly located in a small spherical region surrounding the end of ultrasonic horn during the SSU treatment *** the FSU is applied,the effective cavitation zone is obviously expanded in the *** increases at first and then decreases with increasing the vibration-source spacing(Lv)from 30 mm to 100 ***,when the Lv is 80 mm,the area of effective cavitation zone reaches the largest,indicating the best effect of ***,the acoustic streaming level and flow pattern in the melt also change with the increase of *** the Lv is 80 mm,both the average flow rate and maximum flow rate of the melt reach the highest,and the flow structure is more stable and uniform,with the typical morphological characteristics of angular vortex,thus significantly expanding the range of acoustic *** accuracy of the simulation results was verified by physical experiments of glycerol aqueous solution and tracer particles.

关键词： four-source ultrasound acoustic cavitation streaming field vibration-source spacing

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Enhanced rate and specific capacity in nanorod-like core-shell crystalline NiMoO_(4)@amorphous cobalt boride materials enabled by Mott-Schottky heterostructure as positive electrode for hybrid supercapacitors

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Journal of Energy Chemistry 2023年第10期85卷 276-287,I0009页

作者： Jing-Feng Hou Jian-Fei Gao Ling-Bin Kong State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

The supercapacitor electrode materials suffer from structure pulverization and sluggish electrode kinetics under high current ***,a unique NiMoO_(4)@Co-B heterostructure composed of highly conductive Co-B nanoflakes and a semiconductive NiMoO_(4) nanorod is designed as an electrode material to exert the energy storage effect on *** formed Mott-Schottky heterostructure is helpful to overcome the ion diffusion barrier and charge transfer resistance during charging and ***,this crystalline-amorphous heterogeneous phase could provide additional ion storage sites and better strain ***,the optimized NiMoO_(4)@Co-B hierarchical nanorods(the mass ratio of NiMoO_(4)/Co-B is 3:1)present greatly enhanced electrochemical characteristics compared with other components,and show superior specific capacity of 236.2 mA h g^(-1)at the current density of 0.5 A g^(-1),as well as remarked rate *** present work broadens the horizons of advanced electrode design with distinct heterogeneous interface in other energy storage and conversion field.

关键词： Crystalline-amorphous heterophase Mott-Schottky heterostructure Energy storage Nickel molybdate

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Spontaneous anchoring Cl intoα-Co(OH)_(2) as efficient and stable oxygen reduction electrocatalysts for seawater battery

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Rare Metals 2024年第7期43卷 3074-3083页

作者： Wang Zheng Xue-Rong Zheng Qi Lu Yan-Hui Cao Yang Wang Hai-Peng Fu Jin-Feng Zhang Yi-Da Deng Wen-Bin Hu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Seawater battery is an advanced energy storage system that enables conversion of chemical energy to electricity by consuming metals,dissolved oxygen and seawater in anode,cathode and electrolyte,***,the oxygen reduction reaction(ORR)activity and stability of electrocatalysts can be easily deactivated due to the severe Cl~-permeation and corrosion in seawater ***,we developed a structural buffer engineering strategy by spontaneously anchoring Cl~-intoα-Co(OH)_(2) as efficient and stable ORR electrocatalysts,in which the ultrathinα-Co(OH)_(2) nanosheets were synthesized using an ultrafast solution high-temperature shock(SHTS)*** large lattice space(~0.8 nm)of layeredα-Co(OH)_(2) ensured the spontaneously penetration of Cl~-into the lattice structure and replaced part of OH~-to formα-Co(OH)_(2-x)Cl_*** continuous leaching and compensating of saturated Cl inα-Co(OH)_(2-x)Cl_x could enhance the Cl~-corrosion resistance and modulate electronic structure of Co metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater ***α-Co(OH)_(2-x)Cl_x seawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the counterparts ofα-Co(OH)_(2) and ofβ-Co(OH)_(2) with no Cl~-penetrating and no buffer ***α-Co(OH)_(2-x)Cl_x-based seawater batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g^(-1).

关键词： Seawater battery Oxygen reduction electrocatalyst Solution high-temperature shock Structural buffer engineering

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Recent advances of high performance SiO_(x)(0

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materials Reports(Energy) 2024年第2期4卷 23-33页

作者： Wenwen Deng Ying Zhou Naiqi Hu Shaocong Ni Weihang Zhang Chang Ming Li School of Material Science and Engineering Suzhou University of Science and TechnologySuzhou215009PR China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin300071PR China State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry&Chemical EngineeringNanjing UniversityNanjing210023PR China

SiOx is attractive as an anode material for lithium-ion batteries(LIBs)due to its high capacity,low cost,and relatively higher cyclic stability than Si ***,the intrinsic low electronic conductivity,low initial coulombic efficiency(ICE),and volume expansion during cycles hinder its *** this review,we summarize advances in high performance SiOx anodes,mainly from two aspects:active material and *** future perspective is investigated at the end of this *** review provides strategical guidance for developing high performance SiOx anodes.

关键词： SiOx Anode High-performance Active material Binders

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Copper silicate nanoneedle arrays on reduced graphene oxide like“shelter forest”guiding Zn gradient deposition

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Green Energy & Environment 2025年第5期10卷 967-981页

作者： Na Gao Yang Wang Zhanming Gao Tianming Lv Mengyu Rong Xueying Dong Dongzhi Chen Changgong Meng Yifu Zhang State Key Laboratory of Fine Chemicals School of ChemistryDalian University of TechnologyDalian116024China State Key Laboratory of New Textile Materials&Advanced Processing Technology Wuhan Textile UniversityWuhan430073China Hubei Key Laboratory of Radiation Chemistry and Functional Materials School of Nuclear Technology and Chemistry&BiologyHubei University of Science and TechnologyXianning437100China College of Environmental and Chemical Engineering Dalian UniversityDalian116622China

With the sustainable and efficient development of aqueous zinc ion batteries(AZIBs),the research on addressing the issues of the adaptability and durability of zinc anodes has been hot-topic and is still of great *** this work,inspired by the sand treatment and afforestation of the Gobi Beach in Northwest China to ameliorate the problem of wind and sand encroachment,we propose a material with a morphology similar to that of a“shelter forest”,CuSiO_(3)nanoneedles arrays grown on both sides of reduced graphene oxide(rGO@CuSi),as a coating layer on the zinc metal surface to guide Zn gradient *** presence of rGO improves the electrical conductivity of CuSiO_(3),and the finite element simulation of the electric field and Zn^(2+)concentration proves that the electric field distribution can be effectively homogenized and the local current density can be reduced for the rGO@CuSi-Zn electrode with the surface presenting the shape of a protective *** is due to the abundant pores between the nano-needle array structures on the surface of the electrode,which provide high electron and ion transport paths,and are conducive to achieving uniform Zn deposition,like the principle of wind-sand stabilization by protective *** electrochemical experiments and density functional theory calculations show that the negatively charged surface of r GO@CuSi with good Zn affinity is more capable of guiding Zn^(2+)*** to its inherent material and structural characteristics,the r GO@CuSi-Zn anode has a high specific capacity and good cycling *** study provides insight for interface engineering like protective forest to accelerate the commercialization of high-performance Zn-based batteries.

关键词： Shelter forest CuSiO3nanoneedles arrays Coating Zn anode protection Aqueous Zn-ion batteries

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In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-Qiang Meng Jian-Jiang Wang Dian-Long Wang Kai-Qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

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Microstructure and Mechanical Properties of Magnetic Levitation Fabricated Cu-Ni-Co Multi-principal Element Alloys 75

Microstructure and Mechanical Properties of Magnetic Levitat...

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75th World Foundry Congress, WFC 2024

作者： Zhu, Chengyuan Fu, Zhiqiang Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510640 China

The Cu35Ni35Co30 multi-principal element alloy (MPEA) with dual-FCC phase structure was prepared by magnetic levitation melting. Single-phase face-centered cubic (FCC) structure was obtained by heat treatment at 1030 °C for 15 h. Cold rolling and post-deformation annealing (PDA) heat treatments were used to produce heterogeneous grain structures (HGS). X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with an energy-dispersive spectrometry (EDS) detector were used to characterize the microstructure and phase composition of the alloys and to determine their room temperature tensile properties in different states. The room temperature tensile test was used to determine their mechanical properties in different states. HGS could be achieved in PDA-treated sample at 1030 °C for 60 s. This sample exhibits excellent combination of strength and ductility, showing a tensile yield strength of 562 MPa, an ultimate strength of 758 MPa and a total elongation of 29.9 %. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Tensile testing

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Single crystal growth and characterization of 166-type magnetic kagome metals

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Chinese Physics B 2024年第9期33卷 145-150页

作者： Huangyu Wu Jinjin Liu Yongkai Li Peng Zhu Liu Yang Fuhong Chen Deng Hu Zhiwei Wang Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Zhuhai 519000China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

Kagome magnets were predicted to be a good platform to investigate correlated topology band structure,Chern quantum phase,and geometrical frustration due to their unique lattice *** we reported single crystal growth of 166-type kagome magnetic materials,including HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6),GdMn_(6)Sn_(6)and GdV_(6)Sn_(6),by using the flux method with Sn as the *** them,HfMn_(6)Sn_(6)and ZrMn_(6)Sn_(6)single crystals were grown for the first time.X-ray diffraction measurements reveal that all four samples crystallize in HfFe6Ge6-type hexagonal structure with space group P6/*** samples show metallic behavior from temperature dependence of resistivity measurements,and the dominant carrier is hole,except for GdV6Sn6 which is electron *** samples have magnetic order with different transition temperatures,HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6)and GdV_(6)Sn_(6)are antiferromagnetic with TN of 541 K,466 K and 4 K respectively,while GdMn_(6)Sn_(6)is ferrimagnetic with the critical temperature of about 470 *** study will enrich the research platform of magnetic kagome materials and help explore the novel quantum phenomena in these interesting *** dataset of specific crystal structure parameters for HfMn_(6)Sn_(6)are available in Science Data Bank,with the link.

关键词： kagome metal single crystal growth crystal structure physical property

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Compressible thermoplastic polyurethane/silver nanorod foams for absorption dominant electromagnetic interference shielding

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Journal of materials Science & technology 2024年第30期197卷 9-16页

作者： Zhaoyang Li Yong Shen Yang Zhou Bing Zhou Chuntai Liu Yuezhan Feng State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Shangqiu Normal University Shangqiu 476000China

Conductive polymer composites(CPCs)have attracted significant interest in the field of flexible electro-magnetic protection,but the challenge of balancing high electromagnetic interference shielding effec-tiveness(EMI SE)and low reflection losses still ***,thermoplastic polyurethane/silver nanorod(TPU/AgNR)composite foams have been successfully prepared using both the salt template and vacuum-assisted thermal compression *** varying the AgNRs content and employing a layer-by-layer bonding approach,a gradient structure with optimized impedance matching is ***“absorb-reflect-reabsorb”EM attenuation mechanismofthe asymmetricgradientEMI shieldingin theinternal structure is exploited,resulting in TPU/AgNR foam(TAF)with high EMI SE and significantly reduced EM ***,the three-layer foams exhibit an average shielding efficacy of 35.5 dB and a reflected power coefficient(R)of 0.085 in the X-band,thereby substantially mitigating secondary EM wave ***,these foams demonstrate exemplary compressive resilience,with the sample main-taining excellent EMI shielding stability even after undergoing 100 compression cycles at 50%***,a straightforward approach is employed to fabricate materials with high EMI SE and low reflectivity,offering the potential for use in EM shielding applications of next-generation flexible elec-tronic devices.

关键词： Thermoplastic polyurethane foam Asymmetric gradient structure EMI shielding EM wave absorption Mechanical properties

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Highly oriented MXene/polyvinyl alcohol films prepared by scalable layer-by-layer blade coating for efficient electromagnetic interference shielding and infrared stealth

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Nano Research 2024年第6期17卷 5651-5660页

作者： Jingyu Dong Zhaoyang Li Congqi Liu Bing Zhou Chuntai Liu uezhan Feng State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Shangqiu Normal University Shangqiu 476000China

Controlling the orientation of two-dimensional MXene within layered films is essential to optimize or tune their mechanical properties and electromagnetic interference shielding(EMI)performance,but achieving the high orientation MXene layers on an industrial scale remains a challenging *** this paper,a scalable layer-by-layer blade coating(LbLBC)method was employed to fabricate highly oriented MXene/polyvinyl alcohol(PVA)*** the LbLBC process,MXene/PVA colloid suffered a strong shearing effect,which induced the ordered alignment of MXene nanosheets along the direction of the blade *** orientation of MXene can be effectively adjusted by changing the scraping gap of LbLBC,achieving a maximum Herman orientation factor f of *** a result,the mechanical properties and EMI performance of the as-prepared MXene/PVA films are in direct proportion to their orientation,with the optimal values of tensile strength of 145.5 MPa,fracture strain of 19.6%,toughness of 17.7 MJ·m^(−3),and EMI shielding effectiveness of 36.7 ***,the inherently low mid-infrared(mid-IR)emissivity of MXene,combined with the densely oriented structure affords the composite films with IR stealth,resulting in a substantial decrease from 150 to 66.1℃in the radiative temperature of a ***,these scalable MXene/PVA films exhibit remarkable potential for integration into the next generation of multifunctional protective camouflage materials.

关键词： MXene nanosheets densely oriented structure layer-by-layer blade coating electromagnetic interference shielding infrared stealth

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