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Microstructure and mechanical properties of B 4 C–TiB 2 –SiC-BN composites fabricated by in-situ reaction spark plasma sintering

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Journal of materials Research and technology 2025年 37卷 389-396页

作者： Zeping Wang Wen Zhang Jinyong Zhang Lin Ren Fan Zhang Weimin Wang Zhengyi Fu Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang 441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing. Wuhan University of Technology Wuhan 430070 China

B 4 C-TiB 2 -SiC-BN composites are fabricated by employing B 4 C, Si 3 N 4 , and TiC as raw powders via in-situ reaction spark plasma sintering. The densification behavior, microstructure, and mechanical properties of composites with different additive amounts of (Si 3 N 4 +TiC) are investigated. It is confirmed that the in-situ reaction during the sintering procedure of the composites effectively promotes the densification process. Toughening mechanisms including crack deflection, crack branching, crack bridging coupled with BN pull-out lead to the improvement of flexural strength and fracture toughness. As a result, the composites exhibit optimal performance when 15 wt% (Si 3 N 4 +TiC) are added, with the bulk density, flexural strength, fracture toughness and Vickers hardness of 2.59 g/cm 3 , 705 MPa, 4.4 MPa m 1/2 , and 27.8 GPa, respectively. This provides a novel route to preserve the lightweight characteristics and simultaneously enhance the mechanical performance of B 4 C-based composites.

关键词： B 4 C-TiB 2 -SiC-BN composites In-situ reaction Toughening mechanisms Mechanical properties

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Solid-state stepwise temperature-programmable synthesis of bioinspired Fe-N-C oxygen reduction electrocatalyst featuring Fe-N_(5)configuration

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Nano Research 2025年第3期18卷 654-665页

作者： Wei Sang Somboon Chaemchuen Longyang Zhang Zechen Wang Xingchuan Li Cocoro Andrew Nagasaka Mo Xiong Naoki Ogiwara Cheng Chen Zhao Wang Jian Zhang Francis Verpoort Shichun Mu Zongkui Kou Tingting Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Basic Science School of Arts and SciencesThe University of TokyoKomabaMeguro-kuTokyo 153-8902Japan MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiao tong UniversityXi’an 710049China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China Department of Chemical Engineering Faculty of EngineeringMahidol UniversityNakhon Pathom 73170Thailand School of Mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China Joint Institute of Chemical Research(FFMiEN) Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya Str.117198 MoscowRussia National Research Tomsk Polytechnic University Lenin Avenue 30634050 TomskRussia Hubei Key Laboratory of Ferro &Piezo-electric Materials and DevicesFaculty of Physics and Electronic SciencesHubei UniversityWuhan 430062China School of Chemistry and Chemical Engineering Hainan UniversityHaikou 57022China

The bioinspired Fe-N-C features an asymmetric Fe-N_(5)configuration to produce active metal-oxygen intermediates by introducing axial N ligand into a symmetric Fe-N_(4) structure,enabling highly active oxygen reduction reaction(ORR).However,the artificial creation of active Fe-N_(5)configuration with a direct,facile and green method has been rarely developed yet,as current techniques involve complex processes and costly ***,we advance a novel solid-state stepwise temperature-programmable(SST)route to directly produce bioinspired Fe-N_(5)-*** then demonstrate that such a Fe-N_(5)-C exhibits a quite higher half-wave potential(0.92 V)with 22-fold faster ORR kinetics(15.6 mA·cm^(−2)@0.85 V)over that of the commercial Pt/C ***,we perform density functional theory(DFT)to find that the Fe is discharged with an extra 0.1 e^(−)through the axially coordinate N ligand,which significantly enhances the ability to activate O_(2) and enables an easier desorption of the crucial intermediate ^(*)OH on the Fe-N_(5)configuration over the conventional Fe-N_(4) structure.

关键词： single atom catalysts Fe-N_(5)coordination solvent-free synthesis oxygen reduction reaction(ORR) metal-air battery

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Nonsolvent-Induced Electrospun Fibers with Crater-Like Surface and High-Loading Polytriphenylamine-Derived as a Flexible Cathode for Lithium-Ion Batteries

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SSRN 2023年

作者： Xiong, Yufeng Li, Yingjiang Hu, Zhengfei Sun, Zhengquan Cheng, Yiliang Zhang, Yang Dong, Lijie Center for Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Fabricating electrodes simultaneously possessing remarkable flexibility, excellent mechanical properties, and high energy density remains a significant challenge in flexible lithium-ion batteries (LIBs). Herein, a series of flexible organic composite films were prepared with high-loading polytriphenylamine (PTPA) and the derivatives (PTPA-PO) as active material, along with carbon nanotubes (CNTs) serving as conductive filler. The fabrication employed the polyethylene oxide (PEO) assisted nonsolvent (or poor solvent) induced phase separation electrospinning (NIPSE) method. Subsequently, the fiber morphology and electrochemical applications of the flexible organic composite films were systematically studied. Notably, the 60% PTPA-PO/20% CNTs/PEO flexible electrode with a high-loading active material of 60 wt% exhibits a significant discharge capacity of 146.6 mAh·g-1 and a favorable discharge platform ~ 3.7 V vs. Li. Furthermore, the inherent flexibility of electrode contributes to efficient and stable transport of ions and electrons, resulting in a fine capacity retention of 93.3% after 100 cycles. The improvement of electrochemical performance can be rationalized by the unique internal conductive network and crater-like surface structure of the fibers formed through the NIPSE method. This work provides an efficient method to fundamentally improve the energy storage performance and flexibility of LIBs. © 2023, The Authors. All rights reserved.

关键词： Electrospinning

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界面工程实现Au@MoS_(2)核壳异质结在等离激元学和光电子学领域卓越的热载流子输运动力学

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Science China materials 2023年第10期66卷 3931-3940页

作者：刘然朱翔宇刘盛洪欧阳德才马小茜夏芳芳余一梦张悍吴劲松刘世元梁文锡李渊翟天佑 State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondonE14NSUK State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518057China

贵金属和二维半导体构建的异质结为等离激元纳米结构产生的热载流子提供了独特的电荷传输路径,有望应用于各种等离激元和光电子器件.然而,传统异质结构的电荷转移速度和效率通常受限于有限的界面面积和不可避免的界面污染.本文中,具有... 详细信息

贵金属和二维半导体构建的异质结为等离激元纳米结构产生的热载流子提供了独特的电荷传输路径,有望应用于各种等离激元和光电子器件.然而,传统异质结构的电荷转移速度和效率通常受限于有限的界面面积和不可避免的界面污染.本文中,具有原子级清洁和较大接触界面的新型Au@MoS_(2)核壳异质结构能够实现超快和高效的热电子转移.飞秒瞬态吸收光谱研究表明,Au@MoS_(2)中从金纳米颗粒到MoS_(2)的热电子注入时间常数小于244 fs,而机械转移方法制备的Au/MoS_(2)对照样品的热电子注入时间常数为493 fs,同时,电荷转移效率从Au/MoS_(2)的3.33%提升至Au@MoS_(2)的25.3%.开尔文探针力显微镜和离散偶极近似研究进一步证明了上述结果,明显改善的电荷转移归因于原子级清洁和完全封装的异质结界面.这项研究提供了贵金属-二维半导体异质结构内固有电荷转移的基本理解,从而展现了Au@MoS_(2)这一新型异质结结构在等离激元和光电子器件中的应用前景.

关键词： 2D materials MoS_(2) heterostructures optoelectronics plasmonics

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Deformation mechanisms in aβ-quenched Ti-5321 alloy:In-situ investigation related to slip activity,orientation evolution and stress induced martensite

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Journal of materials Science & technology 2022年第17期112卷 36-48页

作者： Cong Wu Qinyang Zhao Shixing Huang Yongqing Zhao Lei Lei Junqiang Ren Qiaoyan Sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi’an 710049China School of Material Science and Engineering Chang'an UniversityXi’an 710064China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The deformation behavior ofβ-quenched nearβTi-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe)alloy was systematically studied using in-situ tensile test monitored by the scanning electron microscopy(SEM).Besides,the electron backscatter diffraction(EBSD)was performed to thoroughly discuss the deformation *** results indicated that slip activities,crystal rotation and stress induced martensite transformation were the major deformation mechanisms in theβ-quenched Ti-5321 alloy during in-situ tensile *** slip activities were investigated by using the EBSD-trace analysis,which demonstrated that{110}<111>,{112}<111>and{123}<111>slip systems were activated and the{110}<111>slip system ***,βgrains rotated about 7.8°to accommodate the increased ***,the stress induced martensiteα″which was related to the double yielding behavior during tensile process exhibited multiple *** differentα″variants divided theβmatrix into smallerβblocks with a typical zigzag morphology,in which oneα″variant passed through another one by deflecting its initial growth ***,the deformation twinning in martensiteα″and slip bands cutting through martensiteα″effectively accommodated the local *** systematically analysis can provide insightful information about the deformation mechanisms in nearβtitanium alloys.

关键词： In-situ tensile test Slip activity Stress induced martensite Titanium alloys

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ZnO-based micromotors fueled by C02:the first example of self-reorientation-induced biomimetic chemotaxis

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国家科学评论（英文版） 2021年第11期8卷 98-105页

作者： Fangzhi Mou Qi Xie Jianfeng Liu Shengping Che Lamya Bahmane Ming You Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Synthetic chemotactic micro/nanomotors are envisioned to actively'seek out'targets by following specific chemicals,but they are mainly powered by bioincompatible fuels and only show pseudochemotaxis (or advanced chemokinesis) due to their weak self-reorientation *** we demonstrate that synthetic ZnO-based Janus micromotors can be powered by the alternative biocompatible fuel of CO2,and further provide the first example of self-reorientation-induced biomimetic chemotaxis using *** ZnO-based micromotors are highly sensitive to dissolved CO2 in water,which enables the corrosion of ZnO to continuously occur by providing H+ through ***,they can autonomously move even in water exposed to air based on ***,they can sense the local CO2 gradient and perform positive chemotaxis by self-reorientations under the phoretic *** discovery opens a gate to developing intelligent micro/nanomotors powered by,and sensitive to,biocompatible atmospheric or endogenous gaseous chemicals for biomedical and environmental applications.

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碱性和酸性条件下均稳定的高效氧电催化剂:具有多活性中心的多孔纳米片复合材料

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Science China materials 2023年第4期66卷 1407-1416页

作者：夏雁楠程义王锐孟子寒迈耶昆庭赵川张海宁罗任李扬唐浩林 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China Hunan Provincial Key Laboratory of Nonferrous Value-added Metallurgy Central South UniversityChangsha 410083China School of Chemistry The University of New South WalesSydneyNew South Wales2052Australia

可逆的氧还原反应(ORR)和氧析出反应(OER)需要多种类型的活性中心来缓冲质子耦合/解耦的四电子过程.本文通过一种简单环保的熔融NaCl模板法合成了碳包覆FeNi合金、金属-N物种和N缺陷共掺杂的多孔纳米片(FeNi-N/PCN).得到的FeNi-N/PCN作... 详细信息

可逆的氧还原反应(ORR)和氧析出反应(OER)需要多种类型的活性中心来缓冲质子耦合/解耦的四电子过程.本文通过一种简单环保的熔融NaCl模板法合成了碳包覆FeNi合金、金属-N物种和N缺陷共掺杂的多孔纳米片(FeNi-N/PCN).得到的FeNi-N/PCN作为氧电催化剂在碱性(E_(1/2)为0.88 V_(RHE),E_(j=10)为1.57 V_(RHE))和酸性介质(E_(1/2)为0.78 V_(RHE),E_(j=10)为1.76 V_(RHE))中均表现出优异的ORR和OER性能.此外,该FeNi-N/PCN催化剂在锌空气电池中表现出224 m W c m^(-2)的功率密度和691 m A h g^(-1)的比容量,分别是Pt/RuO_(2)组合的1.34和1.20倍.这些优异的性能可以归因于具有多类型活性位点的层状碳纳米片结构,包括碳包覆FeNi合金、N缺陷和金属-N位点(M–N_(x)).

关键词：碳纳米片 FeNi合金电催化剂锌空气电池氧析出反应多孔纳米片碳包覆酸性介质

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Atomic-Scale Mechanisms for Achieving Ultra-High Controllable Electrical Properties in Perovskite Bifeo3

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SSRN 2024年

作者： Lu, Yongshen Chen, Fangze Zhang, Jinyong Ren, Lin Wang, Weimin Zhang, Fan Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Defect engineering strategies are usually expected to enhance electrical, thermal, and optical functionality while tuning the mechanical properties of materials. Here, we employe atomic-scale imaging to characterize the atomic structural positions in bismuth ferrite (BFO)BFO films and demonstrate the precise positions of quantitatively doped ions within the BFO unit cell. Well-controlled oxygen vacancy contents in BFO crystals were engineered via the accurate introduction of Zr and Mn ions, resulting in extraordinary and stable large-signal ferroelectric properties (Pr ~ 206.2 µC/cm2 and J ~ 2.2×10-9 A/cm2), magnetic properties (4.95 emu/cm3) and a reduced bandgap (Eg = 2.16 eV). Furthermore, we used computational processing to obtain the coupling of the spin and charge redistributions of iron, resulting in changes in spontaneous polarization. An atomic-scale study enhanced our understanding of the effects of chemical modifications on the ferroelectricity/ferromagnetism structure. This defect engineering approach enables us to customize and optimize local ferroelectric and ferromagnetic order parameters, providing a foundation for designing functionalities in a wide range of functional material systems. © 2024, The Authors. All rights reserved.

关键词： Iron compounds

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Gallium-based liquid metals for lithium-ion batteries

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Interdisciplinary materials 2022年第3期1卷 354-372页

作者： Bin-Wei Zhang Long Ren Yun-Xiao Wang Xun Xu Yi Du Shi-Xue Dou College of Chemistry and Chemical Engineering Chongqing UniversityChongqingChina Center of Advanced Energy Technology and Electrochemistry Chongqing UniversityChongqingChina Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNorth WollongongNew South WalesAustralia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina BUAA-UOW Joint Research Centre and School of Physics Beihang UniversityBeijingChina

Lithium-ion batteries(LIBs)are one of the most exciting inventions of the 20th century and have been widely employed in modern *** have powered many of our electronics,such as laptop computers,smartphones,and even large-scale energy storage *** the development of modern technology,next-generation LIBs with higher energy density are in demand.A number of electrode materials with high theoretical capacity,including Sn,Si,Li metal anode,and S cathode materials,have been ***,they usually suffer from structural or interface failure during cycling,limiting their practical ***-based liquid metals(LMs)possess self-healing capability,fluidity,and metallic advantages so they have been employed as self-healing skeletons or interfacial protective layers to minimize the negative impact of volume expansion or dendritic growth on the electrode ***,the features of Ga-based LMs are briefly discussed to indicate their potential for battery *** addition,recent developments on Ga-based LMs applied in LIBs have been summarized,including from the aspects of anodes,cathodes,and ***,future opportunities and challenges for the development of Ga-based LMs in LIBs are highlighted.

关键词： anode cathode electrolyte gallium-based liquid metals lithium-ion batteries

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A durable Ni/La-Y catalyst for efficient hydrogenation of γ-valerolactone into pentanoic biofuels

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Journal of Energy Chemistry 2022年第7期31卷 347-355,I0009页

作者： Jiang He Lu Lin Meng Liu Caixia Miao Zhijie Wu Rui Chen Shaohua Chen Tiehong Chen Yang Su Tao Zhang Wenhao Luo CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Heavy Oil Processing and Key Laboratory of Catalysis of CNPC China University of PetroleumBeijing 102249China Key Laboratory of Advanced Energy Materials Chemistry Nankai UniversityTianjin 300350China

Zeolite-supported metal catalysts containing hydrogenation centers and acid sites are promising in the chemoselective hydrogenation of biomass platform molecules into value-added chemicals and *** primary challenge of employing such bifunctional catalysts for biomass conversion lies in catalyst stability in the liquid phase under harsh conditions. Herein, we have prepared a Ni/La-Y nanocatalyst via an improved wet impregnation method. Compared with Ni nanoparticles on H-Y, La addition shows a significantly enhanced stability and performance in the continuous liquid-phase hydrogenation of γ-valerolactone(GVL) into ethyl pentanoate(EP) at 200 ℃ for 1000 h. Complementary characterization studies reveal that La addition in the metal/zeolite catalyst not only efficiently modulates the acid property of the zeolite to alleviate coke formation, but also suppresses zeolite dealumination and metal agglomeration and leaching upon catalysis over a 1000 h period. These findings provide an efficient approach for improving the stability of zeolite-supported bifunctional catalysts, leading to potential application in hydrogen-assisted biomass valorization under the liquid-phase conditions.

关键词： Nickel Zeolite Hydrogenation Stability Biofuel

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