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

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 ***,developing ultrathin absorbent is acknowledged as a linchpin in the design of lightweight and flexible electronic devices,but there are remaining unprecedented ***,the self-assembly VS_(4)/rGO heterostructure is constructed to be engineered as ultrathin microwave absorbent through the strategies of architecture design and interface *** 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 *** 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,*** effective absorption bandwidth of 4.8 GHz can be achieved with an ultrathin thickness of 1.4 *** far-reaching comprehension of the heterointerface on microwave absorption performance is explicitly unveiled by experimental results and theoretical *** and heterointerface synergistically inspire multi-dimensional advantages to enhance dipole polarization,interfacial polarization,and multiple reflections and scatterings of ***,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

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Unveiling inverse vulcanized polymers as metal-free,visible-light-driven photocatalysts for cross-coupling reactions

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Chinese Chemical Letters 2024年第4期35卷 142-146页

作者： Lang Gao Cen Zhou Rui Wang Feng Lan Bohang An Xiaozhou Huang Xiao Zhang Fujian Key Laboratory of Polymer Science Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical EngineeringCollege of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China Fujian Engineering and Research Center of New Chinese Lacquer Materials College of Materials and Chemical EngineeringMinjiang UniversityFuzhou 350108China

Inverse vulcanized polymers(IVPs) that generated from elemental sulfur and smaller amounts of alkenes have found broad promising applications such as cathode materials for Li-S batteries, dynamic and repairable materials, optics applications, and metal sorption. However, their exploration in organic synthesis is still unprecedented. Here we first report the application of inverse vulcanized polymers in catalysis for organic transformations. A biomass-derived inverse vulcanized polymer(IVP-EAE) is found to be capable of catalyzing cross-coupling reactions in a transition-metal-free fashion under visible *** method allows the direct C–H functionalization of pyrroles and N-arylacrylamides with(hetero)aryl halides, respectively, leading to the formation of two sets of structurally important scaffolds including pyrrole-containing biaryls and 3,3-disubstituted oxindoles with high selectivity. We anticipate this study will not only unveil the new potential of IVPs, but also offer a distinct type of catalysts for organic transformations.

关键词： Cross coupling Inverse vulcanized polymers Metal free Photocatalyst Visible light

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Stabilized interfacial structure induced by self-dissolved active atoms in the (HfZrTiTaNb)C high-entropy carbide brazed joint using CoCrFeNi alloy

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Ceramics International 2025年第15期51卷 20006-20015页

作者： Mu, Ruijie Wang, Ying Niu, Shiyu Sun, Kongbo Yang, Zhenwen Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin300350 China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin300350 China

Understanding reaction behavior of the high-entropy solid/liquid interface induced by multicomponent dissolution is critical for the construction of reliable brazed joints for high-temperature service. The brazed joint of (HfZrTiTaNb)C high-entropy carbide (HEC) bonded with a simple CoCrFeNi high-entropy alloy was investigated at 1440–1550 °C for 15–60 min. Under bonding temperatures, HEC grains dissociated into the liquid alloy, and the self-dissolved Zr atoms at the interface between the HEC grains and liquid alloy induced the formation of Zr-riched HEC phase (ZHEC) attached to HEC grains. The ZHEC phases were characterized by the increased Zr content to 21.44 at.% and the coherent orientation with the HEC. The CoCrFeNi alloy did not undergo phase separation after solidifying in the middle of the joint, resulting in a high-entropy interfacial structure, which remained stabilized in the joints over a wide range of process parameters. In addition, the shear strength and high-temperature performance of the joints were evaluated. A joint strength of 266 MPa could be obtained when brazed at 1460 °C for 45 min. At an test temperature of 1000 °C, the joint strength still retained 87 MPa, indicating its positive potential for high-temperature applications. Intergranular fracture of the CoCrFeNi under elevated temperatures was responsible for the decrease in joint strengths. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Cobalt alloys

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High-rate sodium-ion storage of vanadium nitride via surface-redox pseudocapacitance

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Interdisciplinary materials 2023年第3期2卷 434-442页

作者： Qiulong Wei Tingyi Huang Xiaojuan Huang Binhao Wang Yalong Jiang Dafu Tang Dong-Liang Peng Bruce Dunn Liqiang Mai Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance MaterialsCollege of MaterialsXiamen UniversityXiamenChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina Department of Materials Science and Engineering University of California Los AngelesLos AngelesCaliforniaUSA

Vanadium nitride(VN)electrode displays high-rate,pseudocapacitive responses in aqueous electrolytes,however,it remains largely unclear in nonaqueous,Na+-based *** traditional view supposes a conversion-type mechanism for Na+storage in VN anodes but does not explain the phenomena of their size-dependent specific capacities and underlying causes of pseudocapacitive charge storage ***,we insightfully reveal the VN anode exhibits a surface-redox pseudocapacitive mechanism in nonaqueous,Na+-based electrolytes,as demonstrated by kinetics analysis,experimental observations,and first-principles *** ex situ X-ray photoelectron spectroscopy and semiquantitative analyses,the Na+storage is characterized by redox reactions occurring with the V5+/V4+to V3+at the surface of VN particles,which is different from the well-known conversion reaction *** pseudocapacitive performance is enhanced through nanoarchitecture design via oxidized vanadium states at the *** optimized VN-10 nm anode delivers a sodium-ion storage capability of 106 mAh g−1 at the high specific current of 20 A g−1,and excellent cycling performance of 5000 cycles with negligible capacity *** work demonstrates the emerging opportunities of utilizing pseudocapacitive charge storage for realizing high-rate sodium-ion storage applications.

关键词： high-rate capability pseudocapacitance sodium-ion storage vanadium nitride

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Custom-assembled phase change modular devices for personalize speciality:Carbon energy thermal management application

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Nano Research 2025年第3期18卷 22-32页

作者： Yilin Chen Huitao Yu Yiyu Feng Wei Feng School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China Institute of Advanced Technology and Equipment Beijing University of Chemical TechnologyBeijing 100029China

In the context of 5G,the high-frequency cyclicity and inhomogeneity of heat flow put forward higher requirements for the thermal control system of electronic devices,and there is a great need for thermal management modules with fixed point and high efficiency to ensure the long-term development of electronic ***,we selected four phase change molecules with significant differences in phase change temperatures to be composited with graphene aerogel(GA)to obtain Ei@GA,Tetra@GA,Octa@GA,and 1,10-Deca@*** with pure phase change molecules,the thermal conductivity has been increased by more than 20%,and the relative enthalpic efficiency is as high as 98.7%or ***,we assembled the four phase change composites by“reduction welding”to obtain the integrated,modular thermal management device M1-PCMs@*** of inhomogeneous heat generation in electronics by building an inhomogeneous heat generation *** with the homogeneous modules M2-Ei@GA and M3-1,10-Deca@GA,the effective temperature control time of the customized module M1-PCMs@GA is extended by 100.0 and 394.3 s,***,custom-assembled modular thermal management devices have important application prospects in the field of intelligent temperature control of electronic devices,and the idea of cascade assembly enriches the application functions and development direction of intelligent thermal managers.

关键词： graphene aerogel phase change materials assembly customization modular thermal management devices

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Multi-site anchoring lead-halide octahedral by benzylphosphonic acid to regulate phase distribution for efficient PeLEDs

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Nano Research 2024年第11期17卷 10034-10041页

作者： Jiahao Tang Yifei Wang Hengyang Xiang Run Wang Kun Zhang Xinyi Lv Xinrui Chen Ziqing Xu Zhesheng Chen Lei Wang Aidi Zhang An Xie Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and Nanomaterials College of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Engineering Research Center of Functional Polymer Membrane Materials of Jiangsu Province Nanjing Bready Advanced Materials Technology Co. Ltd. Nanjing 211103 China School of Materials Science and Engineering Xiamen University of Technology Xiamen 361024 China

Quasi-two-dimensional perovskite light-emitting diodes (quasi-2D PeLEDs) are emerging as high-potential candidates for new generation of wide-color gamut displays due to their simple, low-cost solution process, and high color purity. However, the luminescence performance of quasi-2D perovskite films is severely limited by dispersed phase distribution and excessive defect density, which are caused by excessive diffusion of nucleation sites during the perovskite growth stage. Here, the benzylphosphonic acid (BPA) molecule, owing to its strong P-O-Pb bond energy sites and strong electronegativity to PEA+, can aggregate lead-halide octahedron to grow high-dimensional phases, avoiding scattered low-dimensional phases (n = 1). The continuous gradient phase distribution will be beneficial to smooth carrier injection and effectively suppress the leakage current in PeLEDs. Meanwhile, the introduction of phosphonic acid groups will fill the vacancies of Pb ions and reduce non-radiative recombination. As a result, the maximum external quantum efficiency (EQE) of PeLEDs can be increased from 8% to 20.6% with a 514 nm light emission and a 21 nm full-width half maximum, and the device lifetime (T 50) is nearly 6-fold of the pristine sample. In addition, this strategy is also suitable for other wavelength. For example, in blue light, performance improvement is also realized that the maximum EQE of 8% and the luminance increased from 1045 to 5264 cd/m2. These results provide a feasible strategy to regulate the phase distribution and passivate the defects of quasi-2D perovskites.

关键词： quasi-2D perovskites light-emitting diodes benzylphosphonic acid phase distribution defect passivation

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Microstructure,microchemistry,and micro-magnetism of dysprosium grain boundary diffused(Nd,Ce)-Fe-B magnets

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Journal of Rare Earths 2025年第3期43卷 556-568,I0005页

作者： Yifei Xiao Lele Zhang Tao Liu Qisong Sun Xiaolong Song Yikun Fang Anhua Li Minggang Zhu Wei Li Division of Functional Materials Central Iron and Steel Research InstituteBeijing 100081China Key Laboratory of Advanced Functional Materials Ministry of Education of ChinaCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

The microstructure of(Nd,Ce)-Fe-B sintered magnets with different diffusion depths was characterized by a magnetic force microscope,and the relationship between the magnetic properties and the local structure of grain boundary diffused magnets is *** domains perpendicular to the c-axis(easy magnetization direction)show a typical maze-like pattern,while those parallel to the c-axis show the characte ristics of plate *** significant gradient change is shown in the concentration of Dy with the direction of diffusion from the surface to the *** diffuses along grain boundaries and(Dy,Nd)_(2)Fe_(14)B layer with a high anisotropy field formed around the *** in-situ electron probe micro-analysis/magnetic force microscopy(EPMA/MFM),it is found that the average domain width decreases,and the proportion of single domain grains increases as diffusion depth *** is caused by both the change of concentration and distribution of *** grain boundary diffusion process changes the microstructure and microchemistry inside the magnet,and these local magnetism differences can be reflected by the configuration of the magnetic domain structure.

关键词： Magnetic microstructures (Nd,Ce)-Fe-B Rare earths Magnetic force microscope Grain boundary diffusion process(GBDP) In-situ

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Crystalline@amorphous core-shell structure of WO3@WO_(3-x)S_(x) established via doping strategy for enhancing magnesium ions storage performance

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Journal of Magnesium and Alloys 2025年第3期13卷 1353-1363页

作者： Shiqi Ding Yuxin Tian Jiankang Chen Guofeng Wang Bing Sun He Lv Lei Wang Guicun Li Alan Meng Zhenjiang Li College of Materials Science and Engineering Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life ScienceMOEShandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongPR China Qingdao Engineering Research Center for New Metallic Functional Materials Characteristic Laboratory of Advanced Metal Functional Materials and Processing in Universities of ShandongQingdao Binhai UniversityQingdao 266555ShandongPR China

Designing cathode possessing crystalline@amorphous core-shell structure with both active core and shell is a meaningful work for resolving the low speciﬁc capacity,unstable cycling performance and sluggish reaction kinetics issues of rechargeable magnesium batteries(RMBs)by providing more active sites as well as releasing inner stress during ***,WO_(3)@WO_(3-x)S_(x) owning crystalline@amorphous core-shell structure containing both active core and active shell is constructed successfully by introducing S into metastable WO3 structure under temperatureﬁeld *** such structure,amorphous shell would provide continuous Mg^(2+)diffusion channels due to its isotropy property for most Mg^(2+)migrating rapidly to interface and then adsorb at ions reservoir formed by interfacial electricﬁeld for increasing speciﬁc *** also makes security for stable structure of WO_(3)@WO_(3-x)S_(x) by alleviating volume expansion of crystalline core WO_(3) during cycling to prolong cycling ***,“softer”ions S^(2-)would weaken interaction between hard acid Mg^(2+) and ionic lattice to enhance Mg^(2+)storage ***,WO_(3)@WO_(3-x)S_(x) delivers the superior cycling performance(1000 cycles with 83.3%),rate capability(88.5 mAh g^(-1) at 1000 mA g^(-1))and speciﬁc capacity(about 150 mAh g^(-1) at 50 mA g^(-1)),which is near 2 times higher than that of *** is believed that the crystalline@amorphous core-shell structure with both active core and shell designing via doping strategy is enlightening for the development of high-performance RMBs,and such design can be extended to other energy storage devices for better electrochemical performance.

关键词： Doping Sulfuration Crystalline@amorphous core-shell structure WO_(3) Rechargeable magnesium batteries

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Dual-salt poly(tetrahydrofuran) electrolyte enables quasi-solid-state lithium metal batteries to operate at -30 ℃

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Journal of Energy Chemistry 2024年第9期96卷 456-463页

作者： Zhiyong Li Zhuo Li Rui Yu Xin Guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074HubeiChina The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The stable operation of solid-state lithium metal batteries at low temperatures is plagued by severe restrictions from inferior electrolyte-electrode interface compatibility and increased energy barrier for Li^(+)***,we prepare a dual-salt poly(tetrahydrofuran)-based electrolyte consisting of lithium hexafluorophosphate and lithium difluoro(oxalato)borate(LiDFOB).The Li-salt anions(DFOB−)not only accelerate the ring-opening polymerization of tetrahydrofuran,but also promote the formation of highly ion-conductive and sustainable interphases on Li metal anodes without sacrificing the Li^(+)conductivity of electrolytes,which is favorable for Li^(+)transport kinetics at low *** of this polymer electrolyte in Li||LiFePO_(4)cells show 82.3%capacity retention over 1000 cycles at 30℃and endow stable discharge capacity at−30℃.Remarkably,the Li||LiFePO4 cells retain 52%of their room-temperature capacity at−20℃and 0.1 *** rational design of dual-salt polymer-based electrolytes may provide a new perspective for the stable operation of quasi-solid-state batteries at low temperatures.

关键词： Poly(tetrahydrofuran) Dual-salt electrolyte Solidel ectrolyte interphase Low-temperature operation Quasi-solid-state battery

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Dual nanoprecipitation and nanoscale chemical heterogeneity in a secondary hardening steel for ultrahigh strength and large uniform elongation

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Journal of materials science & Technology 2024年第18期185卷 245-258页

作者： Shidong Wang Jinhua Wang Shijie Zhang Daixiu Wei Yang Chen Xuequan Rong Wu Gong Stefanus Harjo Xiaochun Liu Zengbao Jiao Zhigang Yang Gang Sha Chunxu Wang Guang Chen Hao Chen Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China J-PARC Center Japan Atomic Energy AgencyIbaraki 319-1195Japan Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China Central Iron and Steel Research Institute Beijing 100081China

Nanoprecipitates and nanoscale retained austenite(RA)with suitable stability play crucial roles in deter-mining the yield strength(YS)and ductility of ultrahigh strength steels(UHSSs).However,owing to the kinetics incompatibility between nanoprecipitation and austenite reversion,it is highly challenging to si-multaneously introduce high-density nanoprecipitates and optimized RA in *** this work,through the combination of austenite reversion treatment(ART)and subsequent flash austenitizing(FA),nanoscale chemical heterogeneity was successfully introduced into a low-cost UHSS prior to the aging *** chemical heterogeneity involved the enrichment of Mn and Ni in the austenite *** resulting UHSS exhibited dual-nanoprecipitation of Ni(Al,Mn)and(Mo,Cr)_(2)C and nanoscale austenite stabilized via Mn and Ni *** hard martensitic matrix strengthened by high-density dual-nanoprecipitates con-strains the plastic deformation of soft RA with a relatively low fraction of-15%,and the presence of relatively stable nanoscale RA with adequate Mn and Ni enrichment leads to a marginal loss in YS but keeps a persistent transformation-induced plasticity(TRIP)*** a result,the newly-developed UHSS exhibits an ultrahigh YS of-1.7 GPa,an ultimate tensile strength(UTS)of-1.8 GPa,a large uniform elongation(UE)of-8.5%,and a total elongation(TE)of-13%.The strategy of presetting chemical heterogeneity to introduce proper metastable phases before aging can be extended to other UHSSs and precipitation-hardened alloys.

关键词： Ultrahigh strength steels Dual-nanoprecipitation Austenite stability TRIP effect Phase transformation

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