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Highly efficient synthesis of boron nitride nanotubes by catalytic chemical vapor deposition of boron/nickel containing precursors

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Journal of Materiomics 2022年第6期8卷 1199-1204页

作者： Heng Wang Haoran Yang Yongzhi Peng Yulin Zheng Dongying Huang Pu Hu Yawei Li Zhengyi Fu Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Key Laboratory of Green Chemical Engineering Process of Ministry of EducationWuhan Institute of TechnologyWuhan430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China

High-purity and high-yield boron nitride nanotubes with large aspect ratio were prepared by a facile two-step process,including the synthesis of boron/nickel containing precursors by precipitation reactions and subsequent thermally catalytic chemical vapor deposition *** influence of catalyst content and annealing temperature on the phase composition and microstructure of the products were *** results show that it is difficult to exert the catalytic effect of nickel-based catalyst at low temperatures(<1400℃).At appropriate temperatures(1400-1500℃),highly crystalline boron nitride nanotubes with a length of more than 50 mm and a diameter of 50 nm are *** content of catalyst in the precursor mainly affects the morphology of the boron nitride *** the content is too low,it is easy to form boron nitride particles;while high catalyst content can easily lead to catalyst aggregation and form a submicron one-dimensional boron nitride with unregular *** on microstructural evolutions,phase changes,and thermodynamic analysis,the vapor-liquid-solid(V-L-S)growth mechanism of the tip growth mode dominates the formation of boron nitride nanotubes has also been verified.

关键词： Boron nitride nanotubes Highly efficient synthesis Boron/nickel containing precursors Growth mechanism

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The aging behavior,microstructure and mechanical properties of AlN/AZ91 composite

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Journal of Magnesium and Alloys 2023年第7期11卷 2458-2468页

作者： Yunxia Sun Changlin Yang Bin Zhang Jianfeng Fan Hongxiang Li Tianhao Zhao Jing Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’anShaanxi 710072PR China Yangtze River Delta Research Institute of NPU TaicangJiangsu 215400PR China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024PR China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083PR China

Microstructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy(OM),high resolution scanning electron microscopy(HRSEM)with an energy dispersive spectrum(EDS),and high-angle annular dark field scanning transmission electron microscopy(HAADF-STEM).The results show that the higher fracture elongation(14±1%)and ultimate tensile strength(275±6 MPa)were simultaneously obtained in the peak-aged AlN/AZ91 *** with AZ91 matrix alloy,the strength was increased by about 44%and the elongation was approximately five times higher,which mainly attributed to the precipitation of nano-sizedγ-Mg_(17)Al_(12)phase and the activation of non-basal slip systems induced by in-situ AlN particles at room ***,the in-situ formation of AlN reinforcements consumed part of Al element in the matrix alloy,which resulted into the volume fraction decreasing ofγ-Mg_(17)Al_(12)precipitates,and then the age hardening and strengthening efficiency were reduced in the AlN/AZ91 *** the other hand,the mismatch of thermal expansion coefficient between AlN particles and AZ91 matrix generated high density dislocations around AlN particles,which promoted the precipitation ofγ-Mg_(17)Al_(12)phase,and then the peak aging time and temperature were decreased.

关键词： Magnesium matrix composites In-situ AlN particles Aging behavior Microstructure Mechanical properties

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Resolving the sintering conundrum of high-rhenium tungsten alloys

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Journal of materials Science & technology 2023年第35期166卷 78-85页

作者： Zhongyou Que Xingyu Li Lin Zhang Xuanhui Qu Zichen Wei Chenguang Guo Haishen Sun Mingli Qin Gang Chen Peinan Du Yanhao Dong Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Tungsten-rhenium(W-Re)alloys with high-Re contents are the preferred refractory metal materials in many applications because of the improved ductility and processability over pure W and low-Re tung-sten ***,the sintering concurrently becomes increasingly more difficult with increasing Re *** we proposed that the sintering conundrum is caused by the lowered crystal symmetry and the wider dihedral angle distribution when body-center-cubic(BCC)W is alloyed with more hexagonal-close-packed(HCP)Re,which results in inefficient pore removal in the final stage *** showed that the conundrum can be resolved by pressureless two-step sintering(TSS)which suppresses acceler-ating final-stage grain growth,and our proposal is supported by the data of the critical densityρc that is required to start the second step for successful TSS at different W-Re *** ultrafine-grained W-Re alloys with∼300 nm average grain size and up to 25 wt%Re were successfully *** work demonstrates the unique opportunities offered by two-step sintering to advance the scientific understanding and technological practices in powder metallurgy and related fields.

关键词： W-Re alloys Two-step sintering Grain growth Ultrafine-grained materials

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Enhanced room temperature CO2 photoreduction on gas-solid interfaces using nanocrystals integrated with ZIF-8 wrapping design

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材料科学技术（英文版） 2025年第6期209卷 55-63页

作者： Xiaoxiong Hou Zhuangzhuang Ma Zhilei Zhang Xiaotong Gao Hongqiang Wang Lichao Jia Key Laboratory of Applied Surface and Colloid Chemistry Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringNational Ministry of EducationShaanxi Normal UniversityXi'an 710119China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of GrapheneXi'an 710072China

Composites derived from metal-organic frameworks(MOFs)show promise as catalysts for the photocat-alytic reduction of ***,their potential is hindered by constraints such as limited light absorp-tion and sluggish electron transfer and separation,impacting the overall efficiency of the photocatalytic *** this study,TiO2 nanocrystals,modified with Ptx+,underwent laser etching were encapsulated within the traditional MOF-ZIF-8 *** enhanced the adsorption capabilities for CO2 reactants and solar light,while also facilitating directed electron transfer and the separation of photogenerated *** finely-tuned catalyst demonstrates impressive CH4 selectivity at 9.5％,with yields of 250.24 μmol g-1 h-1 for CO and 25.43 μmol g-1 h-1 for CH4,utilizing water as a hole trap and H+*** study demonstrates the viability of achieving characteristics related to the separation of photogen-erated charges in TiO2 nanocrystals through laser etching and MOF composite *** offers novel perspectives for designing MOF-based catalysts with enhanced performance in artificial photosynthesis.

关键词： CO2 photoreduction Nanocrystals TiO2 ZIF-8 Wrapping structure

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Electron-injection-engineering induced dual-phase MoO2.8F0.2/MoO2.4F0.6 heterostructure for magnesium storage

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National Science Review 2024年第8期11卷 240-252页

作者： Weixiao Wang Fangyu Xiong Shaohua Zhu Mengyu Yan Xiaobin Liao Kesong Yu Lianmeng Cui Jinghui Chen Junjun Wang Ruoqi Lan Jun Xie Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone) Hainan Institute Wuhan University of Technology

Rechargeable magnesium batteries（RMBs） have received increased attention due to their high volumetric capacity and ***,the sluggish diffusion kinetics of highly polarized Mg2+in host lattices severely hinders the development of ***,we report an electron injection strategy for modulating the Mo 4d-orbital splitting manner and first fabricate a dual-phase M0O2.8F0.2/MoO2.4F0.6heterostructure to accelerate Mg2+*** electron inje ction strategy triggers weak Jahn-Teller distortion in MoO6octahedra and reorganization of the Mo 4d-orbital,leading to a partial phase transition from orthorhombic phase MiO2.8F0.2to cubic phase *** a result,the designed heterostructure generates a built-in electric field,simultaneously improving its ele ctronic conductivity and ionic diffusivity by at least one order of magnitude compared to MoO2.8F0.2and ***,the assembled MoO2.8F0.2/MoO2.4F0.6//Mg full cell exhibits a remarkable reversible capacity of 172.5 mAh g-1at0.1 A g-1,pushing forward the orbital-scale manipulation for high-performance RMBs.

关键词： rechargeable magnesium batteries electron injection strategy dual-phase heterostructure electronic conductivity ionic diffusivity

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NASICONs-type solid-state electrolytes:The history,physicochemical properties,and challenges

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Interdisciplinary materials 2023年第1期2卷 91-110页

作者： Lixiao Zhang Yimeng Liu Ya You Ajayan Vinu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina International School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina Global Innovative Center for Advanced Nanomaterials(GICAN) School of EngineeringCollege of EngineeringScienceand the EnvironmentThe University of NewcastleCallaghanNew South Wales 2308Australia

Solid-state electrolytes are critical for the development of next-generation high-energy and high-safety rechargeable *** all the candidates,sodium(Na)superionic conductors(NASICONs)are highly promising because of their evident advantages in high ionic conductivity and high chemical/electrochemical *** concept of NASICONs was proposed by Hong and Goodenough et *** 1976 by reporting the synthesis and characterization of Na1+xZr2(SixP3−x)O12(0≤x≤3),which has attracted tremendous attention on the NASICONs-type solid-state *** this review,we are committed to describing the development history of NASICONs-type solid-state electrolytes and elucidating the contribution of Goodenough as a tribute to *** summarize the correlations and differences between lithium-based and sodium-based NASICONs electrolytes,such as their preparation methods,structures,ionic conductivities,and the mechanisms of ion *** challenges of NASICONs-structured electrolytes are discussed,and several research directions are proposed to tackle the obstacles toward practical applications.

关键词： electrode/electrolyte interface grain boundary resistance high ionic conductivity NASICONs solid-state electrolyte

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Tuning the reversible chemisorption of hydroxyl ions to promote the electrocatalysis on ultrathin metal-organic framework nanosheets

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Journal of Energy Chemistry 2022年第2期31卷 71-77页

作者： Hong Yu Yao Jing Cheng-Feng Du Jiong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Institute of Advanced Synthesis Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina

Interfacial engineering to alter the configuration of active sites in heterogeneous catalysts is a potential strategy for activity enhancement,but it remains unelucidated for metal-organic frameworks(MOFs).Here,we demonstrate that the surface of two-dimensional Co-based MOF is modified by decorating Ag quantum dots(QDs)simply through in-situ reduction of Ag+*** oxygen evolution reaction(OER),it reveals that the catalysis is mediated by the reversible redox of Co sites between Co^(3+) and Co^(4+) states coupling with transfer of OH*** decoration of Ag QDs decreases the redox potential of Co sites,and thus effectively decreases the overpotential of *** TOFs of Co sites are increased by 77 times to reach 5.4 s^(-1) at an overpotential of 0.35 *** attribute the activity enhancement to the tuning of the coupling process between Co sites and OHions during the redox of Co sites by Ag QDs decoration based on Pourbaix analysis.

关键词： 2D metal-organic frameworks Interfacial engineering Pourbaix analysis Chemisorption of hydroxyl ions Oxygen evolution reaction

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异价离子取代构建高离子电导率的插层结构

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Science Bulletin 2023年第11期68卷 1134-1142,M0004页

作者：孙宗栋梁嘉宁刘开朗冯昕吴宇赵英鹤梁麒吴劲松李会巧翟天佑 State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China

在纳米尺度通道内的离子传输是纳米流体学领域研究的重点.二维(2D)材料的本征层状结构为流体离子提供了稳健的纳米传输通道.为实现流体离子在2D材料薄膜内的高效传输,本文开发了一种新颖的异价离子取代插层策略,通过化学气相输运法直接... 详细信息

在纳米尺度通道内的离子传输是纳米流体学领域研究的重点.二维(2D)材料的本征层状结构为流体离子提供了稳健的纳米传输通道.为实现流体离子在2D材料薄膜内的高效传输,本文开发了一种新颖的异价离子取代插层策略,通过化学气相输运法直接合成多种具有高离子电导结构的单晶.将块体单晶置入水中通过手动摇晃即可获得二维纳米片分散液,组装后的薄膜展现出高的锂离子电导率,优于目前多数关于2D材料薄膜水相锂离子电导率的报道.这种在合成过程中直接构筑离子传输结构的策略与目前已有的先剥离2D材料后对纳米片修饰改性的方法完全不同.因此,这种普适性的异价离子取代插层策略将会为更多高离子电导率的2D材料薄膜的开发提供借鉴与参考.

关键词：离子电导率离子取代纳米片离子传输纳米流体材料薄膜传输通道插层结构

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Manipulating hot carrier cooling in silicon phononic crystals opens new application opportunities

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Chinese Chemical Letters 2023年第9期34卷 1-2页

作者： Peng Zhou Shaojuan Lu Wangnan Li Shulai Lei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Hubei Institute of Aerospace Chemotechnology Xiangyang 441003China Hubei Longzhong Laboratory Xiangyang 441000China

Phononic crystals(PnCs)have had a multiple of important and promising applications such as sonic diodes,acoustic cloaking,optomechanic,and thermoelectrics[1–5].Undoubtably,it is of significance to explore new finding... 详细信息

关键词： diodes application finding

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Fast preparation and thermoelectric performance of AgSTe based materials via plasma activated sintering

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materials Chemistry and Physics 2024年 323卷

作者： Melzi, Bachir Yang, Dongwang Zheng, Yu Zhang, Mingqi Jun, Li Cui, JingJing Jia, Yongzhong Pan, Zhicheng Zhong, Shenglong Yan, Yonggao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

AgSTe based materials have recently been identified as promising thermoelectric materials that have favorable properties at room temperature. They are usually obtained by conventional processes involving melting, annealing, and sintering, which incur significant energy and time expenditures. The present investigation involved the synthesis of Ag20S7Te3 compounds by a fast non-equilibrium methodology, i.e., plasma activated sintering from raw elemental powders. The monoclinic Ag20S7Te3 phase crystal was successfully formed at a temperature of 673 K, accompanied by the presence of a secondary monoclinic phase, Ag2S. The Ag20S7Te3 phase predominated in the monoclinic form, constituting a significant percentage at temperature of 873 K. Furthermore, the thermoelectric figure of merit (zT) of the AgSTe phase at 873 K was determined to be 0.42. The rapid sample synthesis described herein has the potential to significantly reduce the duration required for material synthesis, hence presenting a conspicuous advantage in the context of manufacturing on a wide scale. © 2024 Elsevier B.V.

关键词： Tellurium compounds

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