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Facile Oxygen-promoted synthesis of Cu,N Co-doped Carbon Composites for Oxygen Reduction

Journal of Wuhan University of technology(materials Science) 2021年第6期36卷 796-803页

作者： LIU Qianqian GUO Wei PAN Mu TU Wenmao Hubei Key Laboratory of Fuel Cell Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A new strategy to fabricate oxygen-promoted Cu,N co-doped carbon(OP-CuN@C)composites is *** strategy consists of only two simple steps:chemical polymerization and high temperature *** measurements were conducted to investigate the catalytic activity and mechanism of ORR on the resulting *** the electrochemical results indicate that OP-CuN@C exhibits the best ORR catalytic *** ORR onset potential of OP-CuN@C is slightly lower than that of commercial Pt/C *** good performance is attributed to the large specific surface area,high content of heteroatoms(pyridinic,graphitic nitrogen,and oxygen atom)and synergistic effect between divalent copper and nitrogen dopant.

关键词： oxygen reduction reaction oxygen promotion OP-CuN@C chemical polymerization approach high temperature carbonized method

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Dual surface/bulk engineering of Nb_(2)O_(5) for high-rate sodium storage

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Electron 2023年第2期1卷 73-81页

作者： Yingjun Jiang Xianluo Hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Orthorhombic Nb_(2)O_(5) is a highly promising fast-charging anode material for sodium-ion ***,its poor intrinsic electronic/ionic conductivity limits its ***,we developed a one-step heat treatment method to create an N-doped carbon coating on the outside and S-doped Nb_(2)O_(5) on the inside(CN-SCN).Ionic liquids are used as the source of C/N/S,which synergistically enhance the surface and bulk electronic/ionic *** N-doped carbon coating on the surface exhibits excellent electronic conductivity and a low ion-diffusion barrier,thanks to the high nitrogen ratio and extremely low content(<2 wt%).Auger electron spectroscopy analysis confirms that S atoms detach from the carbon chain of the ionic liquids and enter the bulk Nb_(2)O_(5),resulting in S-doped Nb_(2)O_(5),significantly facilitating reaction *** CN-SCN electrodes exhibit outstanding rate capability,achieving a capacity of up to 94 mAh g^(−1) even at a high current rate of 50 *** paired with activated carbon as the positive electrode,the sodium-ion capacitor with the CN-SCN anode exhibits a high-energy density of up to 59 Wh kg^(−1) and a long cycle life with 73%capacity retention after 10,000 *** work opens up possibilities for low-cost and large-scale production of high-rate Nb_(2)O_(5) for sodium-storage applications.

关键词： fast reaction kinetics ionic liquids orthorhombic Nb_(2)O_(5) sodium-ion capacitors

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Full‑Color Tunable and Highly Fire‑Retardant Colored Carbon Fibers

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advanced Fiber materials 2023年第5期5卷 1618-1631页

作者： Yuxin Luo Yu Zhang Tonghe Xing Annan He Shichao Zhao Zhiyu Huang Zihui Liang Xin Liu Yequn Liu Yuxiu Yu Yong Qin Fengxiang Chen Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies and Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200People’s Republic of China State Key Laboratory of Coal Conversion CAS Key Laboratory of Carbon Materials and Analytical Instrumentation CenterInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001People’s Republic of China State Key Laboratory of Bio‑Fibers and Eco‑Textiles Institute of Functional Textiles and Advanced MaterialsCollege of Textiles and ClothingQingdao UniversityQingdao 266071People’s Republic of China National Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile UniversityWuhan 430200People’s Republic of China

Carbon fibers(CFs)are widely used in various cutting-edge fields,such as aerospace,military,automobiles,and sports,owing to their unique combination of excellent mechanical properties,good thermal stability,and ***,their inherent super-black appearance makes it difficult to satisfy the aesthetic/fashion requirements of the colorful world,and the flammability of CFs severely limits their practical utilization in high-temperature and other extreme ***,we fabricated full-color tunable colored CFs on a large-scale via atomic layer deposition,based on the monolayer film interference *** exhibited brilliant colors and excellent environmental durability in extreme environments,such as intense ultraviolet(UV)irradiation,accelerated laundering,friction,high-temperature,and low-temperature *** CFs also exhibited excellent fire-retardant performance that could withstand alcohol-lamp flame burning for 60 *** work provides insights into an innovative material/structural design that can help achieve rapid development of the CF industry and global carbon neutrality/sustainability.

关键词： Carbon fibers Carbon fiber fabrics Full-colors Environmental durability Fire-retardant

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Bioinspired Centimeter-scale Sensor Free Obstacle-passing Robots with a Wireless Control System

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Journal of Bionic Engineering 2022年第4期19卷 953-964页

作者： Longxin Kan Zhenhua Wu Bo Song Bin Su Yusheng Shi State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Obstacle avoidance is of great importance for mobile robots since it provides protection for the robots’safety and ensures their routine *** are proven to play an important role in robots obstacle avoidance,and they are useful as ***,more sensors indicating additional space,larger weight load and more energy *** unnecessary sensors is conducive to the development of mobile robots and remains *** we demonstrate Sensor Free Obstacle-Passing Robots(SFOPRs)inspired by flies using the Obstacle-passing strategy instead of Obstacle *** ability to autonomously adjust its direction after hitting obstacles and the ability to continuously hit obstacles are 2 key problems that need to be solved to build this *** to arc-shaped head design and undulating motion behaviors,the robots can autonomously adjust their direction to the outline of obstacles,such as a 90°corner,dispersive irregular obstacles,and even an"S"type channel without the assistance of any ***,the caterpillar-like movement enables robots to continuously hit ***,collaborative awareness and mutual aid can be realized among two or more prototype robots,indicating simple yet functional units for future swarm *** study could provide a new strategy to pursue sensor-free obstacle-passing robots for future swarm robot applications.

关键词： Bioinspired Sensor Obstacle Swarm robots Untethered

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Selective Hydrodeoxygenation of Lignin-Derived Vanillin via Hetero-Structured High-Entropy Alloy/Oxide Catalysts

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Energy & Environmental materials 2024年第3期7卷 202-210页

作者： Yan Sun Kaili Liang Ren Tu Xudong Fan Charles Q.Jia Zhiwen Jia Yingnan Li Hui Yang Enchen Jiang Hanwen Liu Yonggang Yao Xiwei Xu Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510640China Department of Chemical Engineering and Applied Chemistry University of Toronto200 College StreetToronto ON M5S3E5Canada State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The chemoselective hydrodeoxygenation of natural lignocellulosic materials plays a crucial role in converting biomass into value-added *** their complex molecular structures often require multiple active sites synergy for effective activation and achieving high ***,it is reported that a high-entropy alloy(HEA)on high-entropy oxide(HEO)hetero-structured catalyst for highly active,chemoselective,and robust vanillin *** heterogenous HEA/HEO catalysts were prepared by thermal reduction of senary HEOs(NiZnCuFeAlZrO_(x)),where exsolvable metals(e.g.,Ni,Zn,Cu)in situ emerged and formed randomly dispersed HEA nanoparticles anchoring on the HEO *** catalyst exhibits excellent catalytic performance:100%conversion of vanillin and 95%selectivity toward high-value 2-methyl-4 methoxy phenol at low temperature of 120℃,which were attributed to the synergistic effect among HEO matrix(with abundant oxygen vacancies),anchored HEA nanoparticles(having excellent hydrogenolysis capability),and their intimate hetero-interfaces(showing strong electron transferring effect).Therefore,our work reported the successful construction of HEA/HEO heterogeneous catalysts and their superior multifunctionality in biomass conversion,which could shed light on catalyst design for many important reactions that are complex and require multifunctional active sites.

关键词： biomass conversion heterogeneous catalysts high-entropy oxide high-entropy alloys lignin pyrolysis

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Microstructural evolution and superelastic properties of ultrafine-graine d NiTi-base d shape memory alloy via sintering of amorphous ribbon precursor

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Journal of materials Science & technology 2023年第7期138卷 80-92页

作者： W.S.Cai H.Z.Lu H.Z.Li Z.Liu H.B.Ke W.H.Wang C.Yang National Engineering Research Center of Near-net-shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

NiTi-based shape memory alloys(SMAs)are considered as cutting-edge intelligent functional ***,it remains a great challenge to obtain ultrafine-grained(UFGed)bulk materials with mm-scale size as well as outstanding superelastic ***,UFGed bulk Ti_(35)Zr_(15)Ni_(35)Cu_(15)NiTi-based SMA is successfully prepared via spark plasma sintering of amorphous ribbon precursor at different sintering temperatures,and microstructural evolution and superelastic properties are symmetrically *** is found that its grain size ranges from UFG to micro-grain with increased sintering temperature regard-less of the predominant B2 matrix in all bulk ***,the orientation relationships between B2 matrix and nano-scale fcc(Ti,Zr)_(2)Ni precipitate evolve from coherent to ***,the UFGed samples exhibit perfect superelasticity with the high recoverable strain of∼5.8%,the stable recov-ery rate above 99%,and the great critical stress inducing martensitic transformation higher than 1 GPa,far superior to the corresponding ones of suction-cast micro-grained TiZrNiCu ***,the perfect superelasticity is attributed to the good resistance to dislocation slip or grain boundary slip by residual nano-scale amorphous phase or secondary phase of coherent and semi-coherent fcc(Ti,Zr)_(2)Ni *** addition,the gentle superelastic plateau is associated to the favorable transfer stress and the strong ability to accommodate dislocation movement,which is generated by the coherent interface between nano-scale fcc(Ti,Zr)_(2)Ni and UFGed B2 *** results suggest that spark plasma sintering of amorphous alloy precursor is a feasible route to obtaining excellent superelasticity in NiTi-based SMAs.

关键词： Shape memory alloy Amorphous alloy Microstructure Superelasticity

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Electromagnetic responses on microstructures of duplex stainless steels based on 3D cellular and electromagnetic sensor finite element models

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International Journal of Minerals,Metallurgy and materials 2024年第12期31卷 2681-2691页

作者： Shuaishuai Xiao Jialong Shen Jianing Zhao Jie Fang Caiyu Liang Lei Zhou Key Laboratory of New Technology of Nonferrous Metals and Materials Processing Ministry of EducationGuilin university of technologyGuilin 541004China Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Guilin University of TechnologyGuilin 541004China Advanced Manufacturing and Materials Centre Warwick Manufacturing Group(WMG)University of WarwickCoventry CV47ALUK

Microstructures determine mechanical properties of steels,but in actual steel product process it is difficult to accurately control the microstructure to meet the *** microstructure characterization methods are time consuming and results are not rep-resentative for overall quality level as only a fraction of steel sample was selected to be *** this paper,a macro and micro coupled 3D model was developed for nondestructively characterization of steel *** electromagnetic signals analysis,the relative permeability value computed by the micro cellular model can be used in the macro electromagnetic sensor *** effects of different microstructure components on the relative permeability of duplex stainless steel(grain size,phase fraction,and phase distribu-tion)were *** output inductance of an electromagnetic sensor was determined by relative permeability values and can be val-idated *** findings indicate that the inductance value of an electromagnetic sensor at low frequency can distinguish dif-ferent *** method can be applied to real-time on-line characterize steel microstructures in process of steel rolling.

关键词： microstructure electromagnetic sensor finite element duplex stainless steel

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Confined nanospace for enhanced photocatalysis

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国家科学评论（英文版） 2021年第3期8卷 3-4页

作者： Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyChina Laboratory of Inorganic Materials Chemistry(CMI) University of NamurBelgium

The world today is very different from how it *** consumption rate of fos-sil fuels compared with the available re-sources and the calamity of global warm-ing frighten *** entire planet is at risk,but these are our *** is the cause and so mankind should find sustainable and green energy solutions to satisfy the needs of society.

关键词：

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Systematic analysis of distinct flow characteristics and underlying microstructural evolution mechanisms of a novel fine-grained P/M nickel-based superalloy during isothermal compression

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Journal of materials Science & technology 2023年第31期162卷 57-73页

作者： Hongning Wen Junsong Jin Xuefeng Tang Xinyun Wang Heyang Yang Yiding Zhang Lei Deng Pan Gong Qingsong Wei Yingjie He Jianzheng Guo State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Wedge Central South Research Institute Co. Ltd.Shenzhen 518000China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Isothermal forging(IF)is an effective method for forming difficult-to-deform materials like P/M *** the isothermal compression microstructural evolution mechanism of a novel P/M s-peralloy provides the basis for its optimized IF *** this study,the isothermal compression tests of a novel fine-grained P/M nickel-based superalloy were carried out at 1000-1150℃with strain rates of 0.001-0.01 s^(−1).The results indicated that the alloy exhibits three distinct flow characteristics:continuous softening after reaching the peak stress,near-steady superplastic flow,and discontinuous hardening,corresponding to different strain rate sensitivity exponent(m)*** microstructural evolution mechanisms,including grain boundary sliding(GBS),dynamic recrystallization(DRX),and grain growth,are dominated in different m-value ***,different roles of primaryγ’play in microstruc-tural evolution were clarified.A moderate fraction of primaryγ’with 8.5%-14.2%can well coordinate the GBS and hinder excessive grain growth at a high m value domain(m>0.4).When 0.2

关键词： P/M nickel-based superalloy Flow characteristic Microstructural evolution Superplastic flow Dynamic recrystallization

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synthesis of highly sinterable MgO powders for IR transparent ceramics

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Ceramics International 2025年

作者： Zhi, Yongli Mei, Bingchu Li, Weiwei Cheng, Jing Luo, Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Jianghuai Advance Technology Center Hefei230000 China

MgO transparent ceramics (TCS) have attracted great interests in the field of infrared window materials due to its wide transmission range, excellent thermal conductivity, and balanced mechanical properties. To date, research on MgO transparent ceramics predominantly relies on commercial MgO powders by spark plasma sintering (SPS). Herein, we report highly sinterable MgO powders synthesized by co-precipitation method, which exhibits pure phase and particle size of 75 nm. When sintered at 950 °C under 45 MPa for 2 h by hot pressed (HP) method, the transmittance of the MgO ceramic sample with the thickness of 2 mm achieved 76.9 % at 0.4 μm and 88.3 % at 5 μm. These optical properties are comparable to or even superior to MgO TCS produced through SPS method. This work shows that the MgO particles synthesized via the co-precipitation method are suitable for producing high optical quality of MgO infrared (IR) transparent ceramics. © 2025

关键词： Thermal conductivity

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