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Architecture Design and Interface Engineering of Self-assembly VS_(4)/rGO Heterostructures for Ultrathin Absorbent

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Nano-Micro Letters 2022年第4期14卷 222-237页

作者： Qi Li Xuan Zhao Zheng Zhang Xiaochen Xun Bin Zhao Liangxu Xu Zhuo Kang Qingliang Liao Yue Zhang Academy for advanced Interdisciplinary Science and Technology Beijing Advanced Innovation Center for Materials Genome EngineeringBeijing Key Laboratory for Advanced Energy Materials and TechnologiesSchool of Materials Science and EngineeringUniversity of Science

The employment of microwave absorbents is highly desirable to address the increasing threats of electromagnetic pollution.Importantly,developing ultrathin absorbent is acknowledged as a linchpin in the design of lightweight and flexible electronic devices,but there are remaining unprecedented challenges.Herein,the self-assembly VS_(4)/rGO heterostructure is constructed to be engineered as ultrathin microwave absorbent through the strategies of architecture design and interface engineering.The microarchitecture and heterointerface of VS_(4)/rGO heterostructure can be regulated by the generation of VS_(4) nanorods anchored on rGO,which can effectively modulate the impedance matching and attenuation constant.The maximum reflection loss of 2VS_(4)/rGO40 heterostructure can reach−43.5 dB at 14 GHz with the impedance matching and attenuation constant approaching 0.98 and 187,respectively.The effective absorption bandwidth of 4.8 GHz can be achieved with an ultrathin thickness of 1.4 mm.The far-reaching comprehension of the heterointerface on microwave absorption performance is explicitly unveiled by experimental results and theoretical calculations.Microarchitecture and heterointerface synergistically inspire multi-dimensional advantages to enhance dipole polarization,interfacial polarization,and multiple reflections and scatterings of microwaves.Overall,the strategies of architecture design and interface engineering pave the way for achieving ultrathin and enhanced microwave absorption materials.

关键词： Architecture design Interface Self-assembly Microwave absorption

Symmetry-breaking of LiMn6 hexatomic-ring in grain surface of Li2MnO3

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Journal of Energy Chemistry 2023年第6期81卷 110-117页

作者： Lihang Wang Shu Zhao Boya Wang Haijun Yu Institute of advanced Battery materials and Devices Faculty of Materials and Manufacturing Beijing University of Technology Key laboratory of advanced Functional materials Ministry of Education Beijing University of Technology

LiMn6hexatomic-rings act as functional units in Li-rich layered oxides(LLOs), which determine the capacity, voltage, and structural stability of LLOs. However, the symmetry of the LiMn6hexatomic-ring is always broken, especially in the grain surface of LLOs, which will greatly affect its electrochemical performance. Herein, the symmetry-breaking of LiMn6hexatomic-ring in the grain surface of Li2MnO3was studied, and their effect on charge compensation mechanism and structure evolution behavior was thoroughly investigated. The results show that the electrochemical activity of the symmetry-broken LiMn6hexatomic-ring is higher than that of the unbroken LiMn6, and the former is more favorable for spinelization on the grain surface. Furthermore, the exposure proportion of crystallographic planes with different symmetry-broken LiMn6hexatomic-ring has also been discussed, which can be adjusted by changing the partial pressure of oxygen. The in-depth understanding of the symmetry-breaking of LiMn6hexatomic-ring will provide more targeted strategies for designing high-performance LLOs cathodes for lithium-ion batteries.

关键词： Li-rich layered oxides LiMn6 functional unit Symmetry-breaking Surface structure Density functional theory

2D mesoporous materials

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National Science Review 2022年第5期9卷 12-14页

作者： Yan Ai Wei Li Dongyuan Zhao Department of Chemistry Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and State Key Laboratory of Molecular Engineering of PolymersFudan University

Mesoporous materials with high surface areas,large pore volumes,tunable nanostructures and diverse compositions have been widely investigate d,and show great promise in adsorption,catalysis,separation,biomedicine,ener...

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Hot compressive deformation of eutectic Al-17at%Cu alloy on the interface of the Cu-Al composite plate produced by horizontal continuous casting

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International Journal of Minerals,Metallurgy and materials 2022年第8期29卷 1578-1588页

作者： Jun Wang Fan Zhao Guoliang Xie Jiaxuan Xu Xinhua Liu Key laboratory for advanced materials Processing(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key laboratory for advanced Metals and materials University of Science and Technology BeijingBeijing 100083China

On the interface of the Cu-Al composite plate from horizontal continuous casting,the eutectic microstructure layer thickness ac-counts for more than 90%of the total interface thickness,and the deformation in rolling forming plays an important role in the quality of the composite plate.The eutectic microstructure material on the interface of the Cu-Al composite plate was prepared by changing the cooling rate of ingot solidification and the deformation in hot compression was investigated.The results show that when the deformation temperature is over 300℃,the softening effect of dynamic recrystallization ofα-Al is greater than the hardening effect,and uniform plastic deformation of eutectic microstructure is caused.The constitutive equation of flow stress in the eutectic microstructure layer was established by Arrhenius hy-perbolic-sine mathematics model,providing a reliable theoretical basis for the deformation of the Cu-Al composite plate.

关键词： horizontal continuous casting copper-aluminium composite plate composite interface eutectic microstructure material hot de-formation experiments constitutive equation

Bioprocess inspired formation of calcite mesocrystals by cation-mediated particle attachment mechanism

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National Science Review 2023年第4期10卷 159-168页

作者： Qihang Wang Bicheng Yuan Wenyang Huang Hang Ping Jingjing Xie Kun Wang Weimin Wang Zhaoyong Zou Zhengyi Fu State Key laboratory of advanced Technology for materials Synthesis and Processing Wuhan University of Technology Hubei Longzhong laboratory

Calcite mesocrystals were proposed, and have been widely reported, to form in the presence of polymer additives via oriented assembly of nanoparticles. However, the formation mechanism and the role of polymer additives remain elusive. Here, inspired by the biomineralization process of sea urchin spine comprising magnesium calcite mesocrystals, we show that calcite mesocrystals could also be obtained via atachment of amorphous calcium carbonate(ACC) nanoparticles in the presence of inorganic zinc ions.Moreover, we demonstrate that zinc ions can induce the formation of temporarily stabilized amorphous nanoparticles of less than 20 nm at a significantly lower calcium carbonate concentration as compared to pure solution, which is energetically beneficial for the atachment and occlusion during calcite growth. The cation-mediated particle atachment crystallization significantly improves our understanding of mesocrystal formation mechanisms in biomineralization and offers new opportunities to bioprocess inspired inorganic ions regulated materials fabrication.

关键词： nonclassical crystallization mesocrystal calcium carbonate zinc ion particle attachment

Photocatalytic hydrogen production toward carbon neutrality:tracking charge separation

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National Science Review 2023年第9期10卷 9-10页

作者： Bao-Lian Su laboratory of Inorganic materials Chemistry University of Namur State Key laboratory of advanced Technology for materials Synthesis and Processing Wuhan University of Technology

Under the vision of ’carbon peaking and carbon neutrality’,the global energy system is facing a deep restructuring.As a clean energy with the potential to achieve zero carbon emissions,hydrogen energy will undoubtedly play an important role.Solar-energy-driven photo catalytic reactions can decompose water to produce hydrogen and reduce carbon dioxide to produce solar fuels.

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Alternating current electroluminescent fibers for textile displays

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National Science Review 2023年第1期10卷 14-16页

作者： Zhen Wang Xiang Shi Huisheng Peng State Key laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Laboratory of Advanced Materials Fudan University

With the emerging 5G and Internet of Things,wearables are developing vigorously [1].Wearables are expected to be flexible,lightweight,breathable and comfortable to satisfy daily applications[2].Integrating electronic devices into textiles to form an electronic textile(e-textile) will simultaneously meet the above requirements and the need for daily clothes.E-textiles with functions of communicating,sensing and supplying power have been widely explored.

关键词： LIGHT-EMITTING-DIODES

界面工程用于提高CoP-Co_(2)P多晶型物在全pH值析氢反应和碱性全解水反应中的电催化性能

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Science China materials 2022年第9期65卷 2433-2444页

作者：陈蕾任金涛袁忠勇 Key laboratory of advanced Energy materials Chemistry(Ministry of Education) National Institute for Advanced MaterialsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China

开发具有丰富活性位点和高本征活性的磷化钴催化剂,用于高效且稳定的析氢反应(HER)和析氧反应(OER)具有重要意义.本工作通过精准地控制球形膦酸钴的热还原温度合理地构建了新型的碳包裹的CoP-Co_(2)P多晶型物.独特的多级孔结构和CoP-Co_... 详细信息

开发具有丰富活性位点和高本征活性的磷化钴催化剂,用于高效且稳定的析氢反应(HER)和析氧反应(OER)具有重要意义.本工作通过精准地控制球形膦酸钴的热还原温度合理地构建了新型的碳包裹的CoP-Co_(2)P多晶型物.独特的多级孔结构和CoP-Co_(2)P之间的异质界面不仅提高了活性位点的数量,而且还保证了优异的内在催化活性.所制备的催化剂展现出优异的电催化活性和稳定性(对于全pH值HER(0.5 mol L^(-1) H_(2)SO_(4):81 mV@10 mA cm^(-2);1.0 mol L^(-1) KOH:109 mV@10 mA cm^(-2);1.0 mol L^(-1) PBS:227 mV@10 mA cm^(-2))和碱性OER(1.0 mol L^(-1) KOH:1.53 V@10 mA cm^(-2))).在作为双电极电解槽中全解水反应的双功能电催化剂时,该材料可以在1.60 V的低电压下,1.0 mol L^(-1) KOH电解液中提供10 mA cm^(-2)的电流密度.本文还详细研究了CoP-Co_(2)P多晶型物在催化反应过程中的结构析出.本工作为用于各种电化学技术中的高效且价格合理的金属磷化物的设计和制备提供了一种新的方法.

关键词： cobalt phosphides polymorphs heterointerface hydrogen evolution oxygen evolution

A room-temperature magnetic semiconductor from a Co-Fe-Nb-B metallic glass

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 94-99页

作者： Yu-Zhang Jiao Dmitry VLouzguine-Luzgin Ke-Fu Yao Zheng-Jun Zhang Na Chen laboratory for advanced materials Processing Technology(MOE) State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key laboratory for advanced materials(MOE) Schoolof Materials Science and EngineeringTsinghua UniversityBeijing 100084China advanced Institute for materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Mathematics for advanced materials-OIL National Institute of Advanced Industrial Science and Technology(AIST)Sendai 980-8577Japan

Magnetic semiconductors with Curie temperatures higher than room temperature show potential for developing spintronic devices with combined data processing and storage functions for next-generation computing systems.In this study,we present an n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3) magnetic semiconductor with a high Curie temperature of~559 K.This magnetic semiconductor has a room-temperature resistivity of~2.10×10^(4)Ωcm and a saturation magnetization of~76 emu/cm^(3).The n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3)magnetic semiconductor was deposited on p-type silicon to form a heterojunction,exhibiting a rectifying characteristic.Our results provide the design principles for discovering high Curie temperature magnetic semiconductors with determined conduction types,which would play an essential role in realizing nonvolatile spin-based transistors that break free from the confines of currently established Si-based information technology.

关键词： magnetic semiconductor ferromagnetic metallic glass high Curie temperature