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Effect of Ni content in Cu_(1-x)Ni_(x) coating on microstructure evolution and mechanical properties of W/Mo joint via low-temperature diffusion bonding

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Journal of materials Science & technology 2020年第19期54卷 171-180页

作者： Mei Rao Guoqiang Luo Jian Zhang Yiyu Wang Qiang Shen Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN37831-6064USA

The 93 W and Mo1 refractory metals were bonded with different Cu_(1-x)Ni_(x) coating interlayers of various Ni content using plasma-activated sintering at 700℃.The effects of the Ni content in the Cu_(1-x)Ni_(x) coating interlayer on the interfacial microstructure evolution and mechanical properties of the W/Mo joints were *** maximum average shear strength of the W/Mo joint was 316.5 MPa when the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was 25%.When the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was below 50%,the atomic diffusion at the W/Mo joint interface was adequate without the formation of intermetallic compounds,as demonstrated by the High Resolution Transmission Electron Microscope analyses of the *** presence of Ni in Cu_(1-x)Ni_(x) promoted diffusion bonding at the interface,which contributed to the high mechanical properties of the W/Mo *** an increase in the Ni content of the Cu_(1-x)Ni_(x) coating interlayer,the Mo Ni intermetallic compound(IMC)nucleated and grew at the Cu1-xNix coating/Mo1 *** the Ni content of the Cu_(1-x)Ni_(x) coating interlayer was above 50%,the generation of a brittle Mo Ni IMC weakened the shear strength of the W/Mo joint dramatically.

关键词： Refractory metal Cu_(1-x)Ni_(x)coating interlayer Solid solution MoNi IMC Microstructure Shear strength

Interwoven scaffolded porous titanium oxide nanocubes/carbon nanotubes framework for high-performance sodium-ion battery

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Journal of Energy Chemistry 2021年第8期30卷 38-46,I0002页

作者： Wen-Bei Yu Wen-Da Dong Chao-Fan Li Nasiruddin Macadam Jiu-Xiang Yang Guo-Bin Zhang Zhi-Yi Hu Tien-Chun Wu Yu Li Tawfique Hasan Li-Hua Chen Li-Qiang Mai Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Cambridge Graphene Centre University of Cambridge9 JJ Thomson AvenueCB30FA CambridgeUnited Kingdom Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000 NamurBelgium

Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of *** dioxide(TiO_(2)),is a promising anode *** performance is however seriously hindered by its low electrical conductivity and the sluggish diffusion of sodium ions(Na^(+))in the TiO_(2)***,this work combines porous TiO_(2)nanocubes with carbon nanotubes(CNTs)to enhance the electrical conductivity and accelerate Na^(+)diffusivity for Na-ion batteries(NIBs).In this composite,an interwoven scaffolded TiO_(2)/CNTs framework is formed to provide abundant channels and shorter diffusion pathways for electrons and *** in-situ X-ray diffraction and cyclic voltammetry confirm the low strain and superior transport kinetics in Na^(+)intercalation/extraction *** addition,the chemically bonded TiO_(2)/CNTs hybrid provides a more feasible channel for Na^(+)insertion/extraction with a much lower energy ***,the TiO_(2)/CNTs composite exhibits excellent electrochemical performance with a capacity of 223.4 m Ah g^(-1)at 1 C and a capacity of 142.8 m Ah g^(-1)at 10 C(3.35 A g^(-1)).The work here reveals that the combination of active materials with CNTs can largely improve the utilization efficiency and enhance their sodium storage.

关键词： Supercapacitor-like Interwoven scaffold Na-ion battery TiO_(2) Carbon nanotubes

Influence of Lattice Strain on the Mechanical Properties of Cosb3 Skutterudites

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SSRN 2023年

作者： Duan, Bo Li, Jialiang Zhang, Xiaolian Li, Guodong Ma, Yuxi Xu, Hao School of Civil Engineering & Architecture Wuhan Polytechnic University Wuhan430023 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Elemental doping has been widely employed to manipulate the electrical and thermal transport properties of thermoelectric materials, without considering the influence to mechanical properties. In skutterudites, electronegative S-dopants have been found to reduce the lattice thermal conductivity. However, the effect of the covalent S-Sb bond on the mechanical properties of CoSb3 skutterudites remains unexplored. Compressive strength, in particular, exhibits a significant reduction in S-doped skutterudites, measuring only 249 MPa, representing a nearly 50% decrease compared to binary skutterudites. Additionally, there is a noticeable drop in the elastic, bulk and shear modulus. With molecular dynamics calculations, the shear strength of S-doped skutterudites also follows a sharp drop at a small ultimate strain. The evolutions of atomic configurations reveal that the lattice strain induced by S-dopants softens the Sb-Sb bond, ultimately leading to structure collapse under low shear stress conditions. These findings underscore the necessity for a comprehensive approach to elemental doping in thermoelectric community. © 2023, The Authors. All rights reserved.

关键词： Strain

Microstructural Evolution of Defects Under Proton Irradiation in Porous Cu

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SSRN 2024年

作者： Li, Honglin Wang, Hao Huang, Zhifeng Wen, Pin Yin, Guanchao Chen, Fei Hubei Longzhong Laboratory Xiangyang441106 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan430070 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China

The high specific strength and exceptional thermal insulating properties of porous metals make them an ideal choice for aerospace structural components and thermal insulation materials. However, in the space environment, proton irradiation leads to the formation of voids, bubbles, and dislocation loops, significantly compromising their physical and mechanical properties. To date, there has been limited attention to the radiation resistance properties in research related to porous metals. This study conducted proton irradiation experiments with a total dose of 1×1017 ions/cm2 on porous Cu. This study discusses and explains the irradiation-induced damage characteristics on the surface of porous Cu before and after proton irradiation. This provides insights into the radiation damage mechanisms within the porous Cu ligaments and the hydrogen release behavior on the ligament surface. Cascade recoil and collision-induced thermal spike effects modify material defect characteristics and crystal structure. This study elucidates the defect evolution mechanism of porous materials under proton irradiation, offering new insights for the design of other radiation-resistant porous materials as protective materials for future advanced space probes. © 2024, The Authors. All rights reserved.

关键词： Radiation damage

Bimetal-organic framework-derived carbon nanocubes with 3D hierarchical pores as highly efficient oxygen reduction reaction electrocatalysts for microbial fuel cells

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Science China materials 2021年第12期64卷 2926-2937页

作者： Neng Chen Zihan Meng Rui Wang Shichang Cai Weibin Guo Haolin Tang Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Noble metal-free and highly efficient electrocatalytic materials with hierarchically porous structures continue to be studied for the oxygen reduction reaction(ORR) in microbial fuel cells(MFCs). We report bimetal-organic framework(bi-MOF)-derived nanocubic Swiss cheese-like carbons with a novel three-dimensional hierarchically porous structure(3D Co-N-C) prepared by utilizing cetyltrimethylammonium bromide(CTAB) as a structure-directing agent to control the formation of a nanocubic skeleton, and silica spheres as a template to form a mesoporous structure. The elemental composition and chemical morphology of this material can be tuned through the Zn/Co ratio to optimize its ORR catalytic activity. The optimized 3D Co-N-C displays excellent ORR catalytic performance(half-wave potential as high as 0.754 V vs. reversible hydrogen electrode and diffusion-limiting current density of 5.576 mA cm^(-2)) in 0.01 mol L^(-1) phosphate-buffered saline(PBS electrolyte),showing it can compete with the commercial 20 wt% Pt/C catalysts. The catalytic capability and long-term durability of 3D Co-N-C as an air-filled cathode electrocatalyst in an MFC device are tested, showing that the 3D CoNC-MFC can reach a high power density of 1257 mW m^(-2) and provide a competitive voltage during a periodic feeding operation for 192 h;these values are much higher than those of the Pt/C-MFC.

关键词： Co-N-doped carbon structure-oriented approach 3D hierarchically porous nanocubes oxygen reduction reaction microbial fuel cells

The Combined Sol-Gel and Ascorbic Acid Reduction Strategy Enabling Ba2Co2Fe12O22 Hexaferrite/Graphene Composite with Enhanced Microwave Absorption Ability

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SSRN 2023年

作者： He, Yu Wang, Ruoqi Wu, Xiaohan Tang, Chuanhao Qian, Jun Zuo, Peiyuan Zhuang, Qixin Liu, Xing Key Laboratory of Special Functional Polymeric Materials and Related Technology Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Graphene featuring low density and high specific surface area, is highly suitable for loading ferrite nanoparticles. However, the current efficient reducing graphene method in fabricating ferrite/graphene composites require high temperatures/pressures, ae well as highly toxic and explosive reducing agents. We herein propose a strategy for synthesizing Ba2Co2Fe12O22 hexaferrite/graphene composite MAMs by mildly reducing graphene oxide using ascorbic acid. This method enables the reduced graphene oxide with comparable C/O ratios and conductivity comparing to that achieved by other reduction methods. The proper mass ratio of graphene oxide to ferrite particles (1:2) and optimized electromagnetic parameters endow the microwave absorbing materials with a minimum reflection loss value of approximately -45.25 dB and an effective bandwidth of around 4.75 GHz. The simulation calculations are further investigated to verify the practical application of this absorber. Accordingly, it is reasonable to conclude this study provides a new synthetic approach on advanced ferrite/graphene composite based MAMs. © 2023, The Authors. All rights reserved.

关键词： Iron compounds

Carbon quantum dots modified TiO_(2) composites for hydrogen production and selective glucose photoreforming

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Journal of Energy Chemistry 2022年第1期31卷 201-208,I0006页

作者： Heng Zhao Xinti Yu Chao-Fan Li Wenbei Yu Aiguo Wang Zhi-Yi Hu Steve Larter Yu Li Md Golam Kibria Jinguang Hu Department of Chemical and Petroleum Engineering University of Calgary2500 University DriveNWCalgaryAlberta T2N 1N4Canada State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Nanostructure Research Centre Wuhan University of Technology.Wuhan 430070Hubei.China Department of Geosciences University of Calgary2500 University DriveNWCalgaryAlberta T2N 1N4Canada

Lignocellulosic biomass photoreforming is a promising and alternative strategy for both sustainable H_(2) production and biomass valorization with infinite solar ***,harsh reaction conditions(high alkalinity or toxic organic solvents),with low biomass conversion and selectivity are often reported in *** this work,we report glucose photoreforming for coproduction of H_(2) and arabinose with improved selectivity under neutral condition using carbon quantum dots(CQDs)modified TiO_(2) *** show that the conventional CQDs fabricated by a facile one-step hydrothermal process could be endowed with novel color changing property,due to the particle aggregation under the regulation of incident *** as-fabricated CQDs/TiO_(2) composites with certain colored CQDs could greatly improve glucose to arabinose conversion selectivity(-75%)together with efficient hydrogen evolution(up to 2.43 mmolh^(-1)g^(-1))in *** arabinose is produced via the direct C1-C2 α-scissions mechanism with reactive oxygen species of·O_(2)^(-) and·OH,as evidenced by ^(13)C labeled glucose and the electron spin-resonance(ESR)studies,*** work not only sheds new lights on CQDs assisted photobiorefinery for biomass valorization and H_(2) coproduction,but also opens the door for rationale design of different colored CQDs and their potential applications for solar energy utilization in the noble-metal-free system.

关键词： CQDs Size regulation Hydrogen production Glucose photoreforming Arabinose

Berlin Green Framework‑Based Gas Sensor for Room‑Temperature and High‑Selectivity Detection of Ammonia

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Nano-Micro Letters 2021年第4期13卷 146-158页

作者： Tingqiang Yang Lingfeng Gao Wenxuan Wang Jianlong Kang Guanghui Zhao Delong Li Wen Chen Han Zhang Institute of Microscale Optoelectronics Collaborative Innovation Centre for Optoelectronic Science and TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro‑Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070People’s Republic of China Research Center for Materials Genome Engineering Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ammonia detection possesses great potential in atmosphere environmental protection,agriculture,industry,and rapid medical ***,it still remains a great challenge to balance the sensitivity,selectivity,working temperature,and response/recovery *** this work,Berlin green(BG)framework is demonstrated as a highly promising sensing material for ammonia detection by both density functional theory simulation and experimental gas sensing *** in BG framework offers abundant active sites for ammonia absorption,and the absorbed ammonia transfers sufficient electron to BG,arousing remarkable enhancement of *** BG framework shows remarkable response to ammonia at 50–110°C with the highest response at 80°C,which is jointly influenced by ammonia’s absorption onto BG surface and insertion into BG *** sensing performance of BG can hardly be achieved at room temperature due to its high *** of conductive Ti3CN MXene overcomes the high resistance of pure BG framework,and the simply prepared BG/Ti3CN mixture shows high selectivity to ammonia at room temperature with satisfying response/recovery speed.

关键词： Berlin green framework Gas sensor Ammonia Room temperature High selectivity

Electrical Properties and Degradation Behavior of Bnt-Bt-Ln Ceramics

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SSRN 2023年

作者： Xu, Qi Yan, Xuerui He, Xin Dong, Shengde Ma, Luxiang Hai, Chunxi Zhou, Yuan Liu, Hanxing College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu610059 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China

Dielectric capacitors are widely used in pulse power systems, electric vehicles, aerospace and defense technology as critical electronic components. Due to the miniaturization and diversification of electronic components, higher requirements are put on the electrical properties and the service life of dielectric capacitors. In this paper, the phase structure, microstructure, dielectric, ferroelectric and failure behavior of (1-x)(Bi0.5Na0.5TiO3-BaTiO3)-xLiNbO3 (BNT-BT-LN, x = 0.01, 0.03, 0.05, 0.07, 0.10) lead-free ceramics were investigated. All the samples exhibited perovskite phase with no secondary impurity. With increasing LiNbO3 concentration, the average grain size gradually increases from 0.78 μm to 1.75 μm. For the composition x = 0.07, the temperature coefficient of capacitance (TCC150°C) was lower than 15% in the range of 35 °C - 400 °C with moderate permittivity (Εr 150 °C = 2050) and low dielectric loss (tanδ150 °C = 0.005). The RC constant is above 19.3 s up to 245 °C. Through Highly Accelerated Life Test (HALT), the mean time to failure (TTF) empirical formula for BNT-BT-LN dielectrics is established. It indicates that the degradation of the insulation resistance process is caused by the electromigration of oxygen vacancies and the TTF is predicted to reach 4.67×106 h at 7 kV/mm and room temperature. © 2023, The Authors. All rights reserved.

关键词： Lithium compounds