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Evolution of γ’ Particles in Ni-Based Superalloy Weld Joint and Its Effect on Impact Toughness During Long-Term Thermal Exposure

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 561-572页

作者： Xian-Kai Fan Fu-Quan Li Lei Liu Hai-Chao Cui Feng-Gui Lu Xin-Hua Tang Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150006China Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co.Ltd Shanghai 200240China

Effects of long-term thermal exposure on γ’ particles evolution and impact toughness in the weld joint of Nimonic 263(N263)superalloy were deeply studied at 750℃.Results showed that the precipitates in the weld metal were mainly composed of fine γ’ particles,bulky MC carbides,and small M23C6 *** the thermal exposure time increasing from o to 3000 h,γ’ particles in the weld metal grew up from 19.7 nm to 90.1 nm at an extremely slow *** being exposed for 1000 h,γ’ particles coarsened and some of them transformed into acicular η *** the same time,MC carbides decomposed to form η phase and γ’ *** dynamic transition ensured the slight reduction in impact toughness of the weld metal after the thermal exposure,which indicated the stable serving performance of N263 weld joint.

关键词： Ni-based superalloy Weld joint Long-term thermal exposure γ’Phase evolution Impact toughness

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Strong Solvent Coordination Effect Inducing Gradient Solid-Electrolyte-Interphase Formation for Highly Efficient Mg Plating/Stripping

SSRN

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SSRN 2023年

作者： Du, Yaoyao Chen, Yanmin Tan, Shuangshuang Chen, Jinlong Huang, Xueting Cui, Lianmeng Long, Juncai Wang, Zhongting Yao, Xuhui Shang, Bo Huang, Guangsheng Zhou, Xiaoyuan Li, Lingjie Wang, Jinfeng Pan, Fusheng School of Chemistry and Chemical Engineering Chongqing University Chongqing400044 China School of Materials Science and Engineering Chongqing University Chongqing400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing400044 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Advanced Technology Institute University of Surrey Guildford SurreyGU2 7XH United Kingdom College of Physics Center of Quantum Materials and Devices Chongqing University Chongqing401331 China

Developing simple Mg-salt electrolytes without chlorine-containing additives is vital for the technical viability of rechargeable magnesium batteries (RMBs). However, the formation of ion-blocking passivation layer on Mg anode in these electrolytes severely hinders the reversible Mg plating/stripping. Here, we successfully designed a highly efficient and chlorine-free Mg(SO3CF3)2/ether electrolyte by introducing 2-methoxyethylamine (MOEA) with a strongly nucleophilic amidogen (-NH2) donor to competing solvation coordination. The preferred decomposition of MOEA in MOEA-coordinated Mg-ion complex generates organic N-containing species in the inner layer, thus forming the gradient organic-inorganic SEI. This gradient SEI enables a fast interfacial Mg2+ migration and uniform Mg plating/stripping at 5 mA cm−2 with 5 mAh cm−2. The Mg(SO3CF3)2/ether/MOEA electrolyte exhibits high oxidation stability (3.5 V vs. Mg/Mg2+), high average Coulombic efficiency (99.3 %, 1000 cycles), excellent rate performance (low overpotential of 570 mV at 7.5 mA cm−2) and good compatibility with Mo6S8 cathode in coin (300 cycles at 1 C) and pouch cells, when using 50 μm Mg anode. Importantly, the relationships between solvation configuration, SEI chemistry and battery performance were successfully built for guiding the design of simple Mg-salt electrolytes in RMBs. © 2023, The Authors. All rights reserved.

关键词： Solvation

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Hydroxylated high-entropy alloy as highly efficient catalyst for electrochemical oxygen evolution reaction

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Science China materials 2020年第12期63卷 2613-2619页

作者： Peiyan Ma Shichao Zhang Mutian Zhang Junfeng Gu Long Zhang Yuchen Sun Wei Ji Zhengyi Fu School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Oxygen evolution reaction(OER),a half reaction involved in electrochemical water splitting,CO2 reduction,and metal–air batteries,restricts the efficiency of these energy conversion systems due to sluggish reaction kinetics[1,2].To accelerate OER,highly efficient electrocatalysts are ***,large-scale applications of the normally used OER catalysts(***2 and IrO2)are hampered by their instability and low *** is highly desirable to develop earth-abundant catalysts with low cost,high activity and long-term ***(Ni,Fe)(oxy)hydroxides(Co(Ni)-(O)OH)have emerged as promising OER catalysts in recent years[3].

关键词： Tafel斜率高熵合金电催化剂电化学活性羟基化超电势电化学活化高效催化剂

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Recent development of implantable and flexible nerve electrodes

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Smart materials in Medicine 2020年 1卷 131-147页

作者： Shi, Yue Liu, Ruping He, Liang Feng, Hongqing Li, Ye Li, Zhou Beijing Institute of Graphic Communication Beijing102600 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing100083 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Implantable electrical devices offer a variety of potential diagnostic options and treatments in different medical fields. Especially in the absence of specific drugs, the implantable nerve electrodes (INEs) are one of the main treatments for neurological diseases such as epilepsy, Parkinson's disease, Alzheimer's disease, etc. INEs are helpful in studying and regulating nervous system via recording nerve electrical signals or stimulating nerve tissue, but the mechanical mismatch between rigid electrode and soft biological tissue is a critical challenge for long-term implantation. The advances in micromachining technologies and materials have greatly promoted the development of INEs, such as enhanced biocompatibility, reduced foreign body reactions, and structural innovation. In particular, the mechanical performances of flexible implantable electrode and soft biological tissue matched better with less tissue damage. In this review, the implantable flexible nerve electrodes (IFNEs) based on functionalized substrates, intelligent electrodes, and innovative structures are elaborated and discussed. We summarized their various applications in neural prosthesis and neural signal recording. We also discussed the questions and possible methods for developing future IFNEs in the perspective. © 2020 The Authors

关键词： Electrodes

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Single-Atom Catalysts for Electrochemical Hydrogen Evolution Reaction: Recent Advances and Future Perspectives

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Nano-Micro Letters 2020年第2期12卷 73-101页

作者： Zonghua Pu Ibrahim Saana Amiinu Ruilin Cheng Pengyan Wang Chengtian Zhang Shichun Mu Weiyue Zhao Fengmei Su Gaixia Zhang Shijun Liao Shuhui Sun Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications VarennesQC J3X 1S2Canada State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China The Key Laboratory of Fuel Cell Technology of Guangdong Province The Key Laboratory of New Energy Technology of Guangdong UniversitiesSchool of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641People’s Republic of China Key Laboratory of Materials Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002People’s Republic of China

Hydrogen,a renewable and outstanding energy carrier with zero carbon dioxide emission,is regarded as the best alternative to fossil *** most preferred route to large-scale production of hydrogen is by water electrolysis from the intermittent sources(e.g.,wind,solar,hydro,and tidal energy).However,the efficiency of water electrolysis is very much dependent on the activity of ***,designing high-effective,stable,and cheap materials for hydrogen evolution reaction(HER)could have a substantial impact on renewable energy ***,single-atom catalysts(SACs)have emerged as a new frontier in catalysis science,because SACs have maximum atom-utilization efficiency and excellent catalytic reaction *** synthesis methods and analytical techniques have been adopted to prepare and characterize these *** this review,we discuss recent progress on SACs synthesis,characterization methods,and their catalytic ***,we highlight their unique electrochemical characteristics toward ***,the current key challenges in SACs for HER are pointed out and some potential directions are proposed as well.

关键词： Single-atom catalysts Nanomaterials Electrocatalyst Hydrogen evolution reaction Electrochemical energy conversion

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Electrically controlled nonvolatile switching of single-atom magnetism in a Dy@C84 single-molecule transistor

arXiv

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arXiv 2024年

作者： Wang, Feng Shen, Wangqiang Shui, Yuan Chen, Jun Wang, Huaiqiang Wang, Rui Qin, Yuyuan Wang, Xuefeng Wan, Jianguo Zhang, Minhao Lu, Xing Yang, Tao Song, Fengqi National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures School of Physics Nanjing University Nanjing210093 China Institute of Atom Manufacturing Nanjing University Suzhou215163 China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering Hefei University of Technology Hefei230009 China MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi'an Jiaotong University Xi’an710049 China Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing210023 China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210023 China

Single-atom magnetism switching is a key technique towards the ultimate data storage density of computer hard disks and has been conceptually realized by leveraging the spin bistability of a magnetic atom under a scanning tunnelling microscope. However, it has rarely been applied to solid-state transistors, an advancement that would be highly desirable for enabling various applications. Here, we demonstrate realization of the electrically controlled Zeeman effect in Dy@C84 single-molecule transistors, thus revealing a transition in the magnetic moment from 3.8 μB to 5.1 μB for the ground-state GN at an electric field strength of 3 − 10 MV/cm. The consequent magnetoresistance significantly increases from 600% to 1100% at the resonant tunneling point. Density functional theory calculations further corroborate our realization of nonvolatile switching of single-atom magnetism, and the switching stability emanates from an energy barrier of 92 meV for atomic relaxation. These results highlight the potential of using endohedral metallofullerenes for high-temperature, high-stability, high-speed, and compact single-atom magnetic data storage. © 2024, CC BY.

关键词： Magnetic storage

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Review on DFT calculation of s-triazine-based carbon nitride

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Carbon Energy 2019年第1期1卷 32-56页

作者： Bicheng Zhu Bei Cheng Liuyang Zhang Jiaguo Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina

To improve the photocatalytic performance of pristine photocatalysts,element doping,construction of composites and fabrication of novel nanostructures are recognized as universal modification *** methods have been experimentally verified to be effective in manifold photocatalytic application over various *** functional theory(DFT)calculation is a powerful and fundamental tool to pinpoint the intrinsic mechanism of the enhanced photocatalytic *** it holds the degree of precision ranging from atoms,molecules to unit ***,recent DFT calculation research progress of modified s-triazine-based graphitic carbon nitride(g-C3N4)systems as photocatalysts is *** specify,we collected information of doping site,formation energy,geometric,and electronic *** also discussed the synergistic effect of work function,Fermi level and band edge position on the built-in electric field,transfer route of photogenerated charge carriers and photocatalytic mechanism(traditional typeⅡor direct Z-scheme heterostructure).Moreover,we analyzed the geometric configuration,band structure,and stability of g-C3N4 nanocluster,nanoribbon,and ***,future perspective in the further theoretical revelation of g-C3N4-based photocatalysts is proposed.

关键词： charge transfer density functional theory electronic property g-C3N4 photocatalysis

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Post-annealing tailored 3D cross-linked TiNb2O7 nanorod electrode: towards superior lithium storage for flexible lithium-ion capacitors

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Science China materials 2020年第4期63卷 492-504页

作者： Bohua Deng Haoyang Dong Tianyu Lei Ning Yue Liang Xiao Jinping Liu School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

TiNb2O7 anode materials(TNO)have unique potential for applications in Li-ion capacitors(LICs)due to their high specific capacity of ca.280 mA h g^-1 over a wide anodic Li-insertion potential ***,their highrate capability is limited by their poor electronic and ionic *** particular,studies on TNO for LICs are lacking and that for flexible LICs have not yet been ***,a unique TNO porous electrode with cross-linked nanorods tailored by post-annealing and its application in flexible LICs are *** binder-free TNO anode exhibits superior rate performance(~66.3%capacity retention as the rate increases from 1 to 40 C),which is ascribed to the greatly shortened ion-diffusion length in TNO nanorods,facile electrolyte penetration and fast electron transport along the continuous single-crystalline nanorod ***,the TNO anode shows an excellent cycling stability up to 2000 cycles and good flexibility(no capacity loss after continuous bending for 500 times).Model flexible LIC assembled with the TNO anode and activated carbon cathode exhibits increased gravimetric and volumetric energy/power densities(~100.6 W h kg^-1/4108.8 W kg^-1;10.7 mW h cm^-3/419.3 mW cm^-3),more superior to previously reported hybrid *** device also efficiently powers an LED light upon 180°bending.

关键词： post-annealing cross-linked nanorods facile electron transport superior rate performance flexible Li-ion capacitors

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Thin-film deposition techniques in surface and interface engineering of solid-state lithium batteries

Next Nanotechnology

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Next Nanotechnology 2023年 3-4卷

作者： Yu, Yongkun Gong, Minjian Dong, Chenxu Xu, Xu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan 430070 China

Extensive efforts have been dedicated to improving the physical and (electro)chemical properties of solid electrolytes in pursuit of promising all-solid-state batteries (ASSBs). Nevertheless, increasing studies has demonstrated the critical impact of interface issues on battery performance. Hence, the primary focus of this review is on the utilization of thin-film deposition techniques (TFDTs) in surface and interface engineering of ASSBs. First, we explain the issues associated with solid-solid interfaces. Second, the working mechanism and advantages/disadvantages of TFDTs are briefly introduced. Third, we summarize the existing studies and highlight notable progress in the anode and cathode interfaces of ASSBs. The interface of all-solid-state thin-film batteries (ATFBs) is also discussed. Lastly, we conclude the relevant scientific problems of TFDTs application in ASSBs interface engineering, and provide future directions and prospects. © 2023 The Authors

关键词： All-solid-state batteries Interface engineering Lithium/lithium-ion batteries Thin-film deposition techniques

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2D CoOOH Sheet-Encapsulated Ni2P into Tubular Arrays Realizing 1000 mA cm^-2-Level-Current-Density Hydrogen Evolution Over 100 h in Neutral Water

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Nano-Micro Letters 2020年第10期12卷 247-262页

作者： Shucong Zhang Wenbin Wang Feilong Hu Yan Mi Shuzhe Wang Youwen Liu Xiaomeng Ai Jiakun Fang Huiqiao Li Tianyou Zhai Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi University for NationalitiesNanning 530008GuangxiPeople’s Republic of China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China

Water electrolysis at high current density(1000 mA cm-2 level)with excellent durability especially in neutral electrolyte is the pivotal issue for green hydrogen from experiment to *** addition to the high intrinsic activity determined by the electronic structure,electrocatalysts are also required to be capable of fast mass transfer(electrolyte recharge and bubble overflow)and high mechanical ***,the 2D CoOOH sheet-encapsulated Ni2P into tubular arrays electrocatalytic system was proposed and realized 1000 mA cm-2-levelcurrent-density hydrogen evolution over 100 h in neutral *** designed catalysts,2D stack structure as an adaptive material can buffer the shock of electrolyte convection,hydrogen bubble rupture,and evolution through the release of stress,which insure the long cycle ***,the rich porosity between stacked units contributed the good infiltration of electrolyte and slippage of hydrogen bubbles,guaranteeing electrolyte fast recharge and bubble evolution at the high-current *** that,the electron structure modulation induced by interfacial charge transfer is also beneficial to enhance the intrinsic ***,the multiscale coordinated regulation will provide a guide to design high-efficiency industrial electrocatalysts.

关键词： Large-scale hydrogen production Mass transport 2D adaptive material Interfacial charge modulation Multiscale coordinated regulation

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