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Improving high-field strain and temperature stability on KNN-based ceramics sintered in reducing atmosphere via defect engineering

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Journal of Materiomics 2024年第6期10卷 1165-1175页

作者： Zhenyong Cen Meiyi Feng Fuzhi Cao Yuqi Jiang Ze Xu Changrong Zhou Ke Wang Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Proce sing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi Univers ityNanning530004China Guangexi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High-field strain and its temperature stability of(1-x)K_(0.48)Na_(0.52)Nb_(0.96)Ta_(0.04)O_(3)-xBaZrO_(3)+8%MnO+3%ZrO_(2)(in mole,KNNT-xBZ+8Mn)ceramics sintered in reducing atmosphere are improved simultaneously via defect design in A and B *** is a conducting type transition from n-type to p-type at x=*** BaZrO_(3) dopant not only induces the increase of defects(Zr′_(Nb),Ba_(Na),Ba_(K))concentration,but also results in the increase of defect(Mn″_(Nb))concentration,because more Mn ions as+2 oxidation state in ceramics is triggered by BaZrO3 doping *** dipoles(Mn″_(Nb)-V_(o),Zr′_(Nb)-V_(o),Ba_(Na)-V′_(Na),Ba_(Na)-V′_(Na))in poled and aged ceramics enhance the reversibility of the non-180°domains switching,which increases the high-field strain of KNNT-xBZ+8Mn *** reversibility of non-180°domain switching can be preserved to high temperature due to stable defect dipoles(Ba_(Na)-V′_(Na),Ba_(K)-V′_(K))in *** KNNT-xBZ+8Mn ceramics at x=0.07 show the largest high-field strain coefficient(543 pm/V@20 kV/cm)and the highest temperature stability(125℃).The KNNT-xBZ+8Mn ceramic is a lead-free material with great potential to be applied in the fabrication of multilayer ceramic actuators with Ni inner electrodes in the future.

关键词： Lead-free ceramics Piezoelectric materials Reducing atmosphere Defects

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Improving mechanical properties of Mg-Sn alloys by co-addition of Li and Al

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Progress in Natural Science:materials International 2023年第3期33卷 355-363页

作者： Zhen Pan Hucheng Pan Yu Huang Zhihao Zeng Zhang-Zhi Shi Chubin Yang Yuping Ren Lu-Ning Wang Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) College of Materials Science and Engineering Northeastern University Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Advanced Materials Processing of Ministry of Education School of Materials Science and Engineering University of Science and Technology Beijing Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal University

In this work, a novel low-alloyed Mg-Sn-Li-Al alloy with high-strength has been developed. The addition of ～1 wt% Li into the Mg-2Sn wt.% binary alloy can change the type of strengthening phases in Mg-2Sn-1Li sample(TL21),involving the formation of both Li2Mg Sn and Mg2Sn phases. The co-addition of ～1 wt% Al and ～1 wt% Li can further induce the higher density of both micron-sized phases and nano-precipitations in the Mg-2Sn-1Li-1Al sample(TLA211). The nano-precipitations can inhibit the grain growth, which thus lead to the fine grain size of ～1.38 μm in TLA211 sample, and ～1.59 μm in the TL21 sample. Besides, the profuse nano-phases would improve the yield strength via Orowan hardening effect. Consequently, the TL21 sample can exhibit the high yield strength of ～204 MPa, and elongation of ～6.6%. The TLA211 sample exhibits the much higher yield strength of～250 MPa, ultimate tensile strength of ～291 MPa, and also high elongation of ～9.0%. The high strength-ductility synergy, together with the low-Sn content, make the present Mg-Sn based alloy to be potential for the wider industrial applications.

关键词： Mg wrought alloy Nano-precipitations Strengthening Grain refinement Mechanical properties

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Atomically dispersed dual Fe centers on nitrogen-doped bamboo-like carbon nanotubes for efficient oxygen reduction

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Nano Research 2022年第3期15卷 1966-1972页

作者： Ligang Ma Junlin Li Zhiwei Zhang Hao Yang Xueqin Mu Xiangyao Gu Huihui Jin Ding Chen Senlin Yan Suli Liu Shichun Mu School of Electronic Engineering Nanjing Xiaozhuang UniversityNanjing 211171China Nanjing Key Laboratory of Optometric Materials and Technology Jinling Institute of TechnologyNanjing 211169China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

Interfacial atomic configuration between dual-metal active species and nitrogen-carbon substrates is of great importance for improving the intrinsic activity of catalysts toward oxygen reduction reaction(ORR).Thus,from the atomic-scale engineering we develop a high intrinsic activity ORR catalyst in terms of incorporating atomically dispersed dual Fe centers(single Fe atoms and ultra-small Fe atomic clusters)into bamboo-like N-doped carbon *** from atomically dispersed dual-Fe centers on the atomic interface of Fe-Nx/carbon nanotubes,the fabricated dual Fe centers catalyst exhibits an extremely high ORR activity(E_(onset)=1.006 V;E_(1/2)=0.90 V),beyond state-of-the-art Pt/***,this catalyst also shows a superior kinetic current density of 19.690 mA·cm^(−2),which is 7 times that of state-of-the-art Pt/***,based on the excellent catalyst,the primary Zn-air battery reveals a high power density up to 137 mW·cm^(−2) and sufficient potential cycling stability(at least 25 h).Undoubtedly,given the unique structure–activity relationship of dual-Fe active species and metal-nitrogen-carbon substrates,the catalyst will show great prospects in highly efficient electrochemical energy conversion devices.

关键词： atomic configuration single Fe atoms atomically dispersed Fe clusters N-doped bamboo-like carbon nanotubes oxygen reduction reaction

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“Coffee ring” controlment in spray prepared >19% efficiency Cs_(0.19)FA_(0.81)PbI_(2.5)Br_(0.5) perovskite solar cells

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Journal of Energy Chemistry 2022年第4期31卷 201-208页

作者： Xinxin Yu Jing Li Yanping Mo Tianxing Xiang Zhiliang Ku Fuzhi Huang Fei Long Yong Peng Yi-Bing Cheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Zhongshan 528437GuangdongChina College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004GuangxiChina

Achieving high-quality perovskite films with uniform morphology and homogeneous crystallinity is challenging owing to the coffee ring effect(CRE) in the spray-coating technologies. In this study, an evaporation/spray-coating two-step deposition method is used to fabricate Cs_(0.19)FA_(0.81)PbI_(2.5)Br_(0.5)light harvesters for perovskite solar cells(PSCs). Considering the solid–liquid reaction, we establish a reaction-dependent regulating strategy that inhibits CRE successfully and prepare a high-quality perovskite layer, wherein the solvent for the FAI/Br solution during the spraying process is changed from isopropanol to n-butyl alcohol(NBA). The retarded-drying-enhanced spreading of the NBA solution inhibits contact line pinning to suppress the capillary flows and increases the reaction between metal halides(CsI/PbI_(2)) and organic salts(FAI/Br), which result in a reduction in the accumulation of solutes in the periphery effectively inhibiting CRE. Consequently, we obtain a high performance Cs_(0.19)FA_(0.81)PbI_(2.5)Br_(0.5) PSC with a power conversion efficiency(PCE) of 19.17%. An enlarged perovskite film(10 × 10 cm^(2)) containing 40 sub-cells is prepared. The average PCE of these devices is 18.33 ± 0.56%, proving the reliability of the "coffee ring" regulating strategy. This study provides an effective approach for CRE controlment in spraying technology to achieve high repeatability devices with good performance.

关键词： Cs_(0.19)FA_(0.81)PbI_(2.5)Br_(0.5)perovskite solar cells Spray coating Coffee ring effect Reaction-dependent regulating strategy

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Simulation of the Heat Transfer during the Casting Process by Mirror U-Net Models

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Defect and Diffusion Forum 2024年 433卷 97-104页

作者： Kang, Jinwu Zhao, Qichao Wang, Jiwu Han, Xiao Yang, Yahui School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing Technology Tsinghua University Beijing100084 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China

Deep learning has achieved great progress in image recognition, segmentation, semantic recognition, and game theory. It also shows potential to solve scientific computing such as simulation problems in engineering. On the other hand, the numerical simulation method requires constitutive modelling, involves a huge computation volume and takes a long time. In this paper, two mirror U-Net models were proposed for the simulation of the heat transfer during the casting process. These models include an upper U-Net branch for the treatment of the geometries of casting, mold, and chill, and a lower U-Net branch for the treatment of the initial temperature field. Their difference is whether the bottoms of upper and lower U-Nets are shared. These two branches tackle the problems involving the input of a geometrical model which consists of three types of materials and the input of an initial or current temperature field image. These models were trained and validated with a big database with hundreds of casting shapes. The prediction results show that the average accuracy reaches 98.8%. © 2024 Trans Tech Publications Ltd, Switzerland.

关键词： Semantic Segmentation

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Strategies for Intelligent Detection and Fire Suppression of Lithium-Ion Batteries

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Electrochemical Energy Reviews 2024年第1期7卷 1202-1249页

作者： Zezhuo Li Jianlong Cong Yi Ding Yan Yang Kai Huang Xiaoyu Ge Kai Chen Tao Zeng Zhimei Huang Chun Fang Yunhui Huang State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina School of Materials Science and Engineering Hefei University of TechnologyHefei 230009AnhuiChina Shanghai Research Institute of Materials Shanghai 200437China

Lithium-ion batteries(LIBs)have been extensively used in electronic devices,electric vehicles,and energy storage systems due to their high energy density,environmental friendliness,and ***,LIBs are sensitive to environmental conditions and prone to thermal runaway(TR),fire,and even explosion under conditions of mechanical,electrical,and/or thermal *** unpredictable hazardous consequences significantly limit the commercial applications of ***,these safety issues need to be urgently *** this review,the TR mechanisms and fire characteristics of LIBs are systematically *** thermal safety monitoring methods,including the traditional technologies such as tempera-ture,voltage,and gas sensors,as well as the latest new technologies such as optical fiber sensors and ultrasonic imaging,are summarized.A battery thermal management system(BTMS)based on various cooling methods and new insights into the BTMS are briefly *** to the fire characteristics of LIBs,nonaqueous and water-based fire extinguishing agents are comprehensively summarized and compared,and the concept of an intelligent fire protection system is *** on the analysis of the thermal safety issues for preventing possible TRs and for extinguishing an already uncontrollable fire,a complete set of solutions for the thermal safety of LIBs is *** this review,integrated strategies for intelligent detection and fire suppression of LIBs are presented and can provide theoretical guidance for key material design and intel-lectual safety systems to promote wide application of LIBs.

关键词： Lithium-ion battery Safety Thermal runaway Monitoring and management systems Firefighting

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Promoting amorphization of commercial TiO_(2) upon sodiation to boost the sodium storage performance

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Journal of Energy Chemistry 2023年第6期81卷 379-388,I0009页

作者： Tao Li Ling-Yun Kong Xue Bai Yan-Xiang Wang Yong-Xin Qi Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250061ShandongChina School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina

Anatase TiO_(2) is a promising anode material for sodium-ion batteries,yet the low electronic and ionic conductivities are the main obstacles for its practical *** though the amorphization of TiO_(2) upon sodiation has already been observed,its underneath mechanisms are not fully ***,a low-cost nitrogen-containing carbon source of polyacrylonitrile is adopted to modify commercial anatase TiO_(2) by a convenient and nontoxic ball-milling technique combined with subsequent annealing *** particular,the employment of a nitrogen-doping approach accompanied by nitrogendoped carbon coating,results in a greatly improved conductivity,overall leading to a high reversible capacity of about 260 m A h g^(-1)at 25 m A g^(-1),superior rate capabilities,and an ultra-stable capacity of about 186 m A h g^(-1)after 1600 cycles at 500 m A g^(-1).Detailed characterizations denote that the improved conductivity as well as the small size of the synthesized TiO_(2) grains play a key role in the TiO_(2) amorphization upon sodiation,with the TiO_(2)/C nanocomposite undergoing a complete amorphization in just few ***,the irreversible amorphization of TiO_(2) is confirmed to be a crucial ingredient facilitating the Na+diffusion kinetics and pseudocapacitive behavior,thus boosting the sodium storage performance.

关键词： Commercial TiO_(2) Anode material Amorphization Nitrogen doping Sodium-ion battery

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Origin of low lattice thermal conductivity in promising ternary Pb_(m)Bi_(2)S_(3+m)(m=1-10)thermoelectric materials

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Journal of materials Science & technology 2024年第31期198卷 12-19页

作者： Wei Liu Biao Chen Liqing Xu Dongyang Wang Changsheng Xiang Xiangdong Ding Yu Xiao State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450052China

Ternary Pb-Bi-S compounds emerge as potential thermoelectric materials owing to low thermal conductivity,but the origin of their intrinsic low lattice thermal conductivities lacks further ***,a series of ternary Pb_(m)Bi_(2)S_(3+m)(m=1-10)compounds are synthesized and their crystal structure evolutions with increasing m values are clearly *** room-temperature lattice thermal conductivities in PbBi_(2)S_(4),Pb_(3)Bi_(2)S_(6) and Pb_(6)Bi_(2)S_(9) can reach at 0.57,0.56 and 0.80 W m^(-1) K^(-1),respectively,outperforming other ternary sulfur-based *** calculations show that the low lattice thermal conductivities in Pb_(m)Bi_(2)S_(3+m)(m=1-10)mainly originate from soft phonon dispersion caused by strong lattice anharmonicity,and both asymmetric chemical bond and lone pair electrons(Pb 6s2 and Bi 6s2)can favorably block phonon ***,the elastic measurements also confirm relatively low sound velocities and shear modulus,and the Grüneisen parameter(γ)calculated by sound velocities can reach at 1.67,1.85 and 1.94 in PbBi_(2)S_(4),Pb_(3)Bi_(2)S_(6) and Pb_(6)Bi_(2)S_(9),***,the intrinsic low lattice thermal conductivities in Pb_(m)Bi_(2)S_(3+m)(m=1-10)contribute to promising thermoelectric performance,and the maximum ZT values of 0.47,0.38 and 0.45 can be achieved in undoped PbBi_(2)S_(4),Pb3Bi_(2)S_(6) and Pb_(6)Bi_(2)S_(9),respectively.

关键词： Crystal structure evolution Lattice thermal conductivity Phonon dispersion Lattice anharmonicity Lone pair electrons

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Highly efficient chemicalproductionviaelectrified,transient high-temperature synthesis

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eScience 2024年第4期4卷 41-53页

作者： Yichen Dong Yi Rao Hanwen Liu Hao Zhang Rong Hu Yingquan Chen Yonggang Yao Haiping Yang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In response to the current energy and environmental challenges,reducing or replacing reliance on fossil fuels and striving for carbon neutrality seems to be the only viable ***,a cutting-edge,eco-friendly method of chemical synthesis via transient Joule heating(JH)demonstrated significant promise across various domains,including methane reforming,ammonia synthesis,volatile organic compounds removal,plastic recycling,the synthesis of functional carbon materials from repurposed solid waste,*** this review,the advantages,and latest developments in thermochemical synthesis by flash and transient JH are comprehensively *** the ongoing heating process of conventional furnaces that consume fossil fuels,dynamic and transient JH can get significantly higher reaction rates,energy efficiency,flexibility,and ***,the transient reaction mechanism,data science optimization,and scale-up production models are discussed,and prospects for the integration of the electrified chemical industry with renewable energy for carbon neutrality and long-term energy storage are also envisioned.

关键词： Electrified chemicalsynthesis Transient heating Low-carbon production Gas-phasereaction Solid waste

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In Situ Tin Doping to Enhance the Cycling Performance of 4.9 V LNMO Cathode materials 7

In Situ Tin Doping to Enhance the Cycling Performance of 4.9...

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7th International Conference on Power and Energy Applications, ICPEA 2024

作者： Li, Yan Du, Jinqiao Liang, Zhaojie Tian, Jie Wang, Pei Luo, Wen Electric Power Scientific Research Institute Shenzhen Power Supply Bureau Co. Ltd Shenzhen China Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan China

ISBN: (纸本)9798350356113

LiNi0.5Mn1.5O4 (LNMO) cathode material has the advantages of high energy density (650 Wh/kg), high discharge voltage (4.7 V vs Li+/Li), low raw material cost, low pollution, and high lithium ion transmission efficiency. It is a potential high power, low cost cobalt-free lithium-ion battery cathode material. However, the capacity decline of LNMO during high voltage charge and discharge processes leads to short cycle life, which limits its wide application and commercialization. To address this issue, this article uses in-situ Sn doping to enhance the cycle stability of LNMO. By uniformly mixing acetate salts in stoichiometric ratio and using one-step spray drying method to prepare undoped and Sn-doped LNMO cathode materials, this study systematically investigates the structural changes, morphological characteristics, and electrochemical performance before and after doping. The capacity retention rates of Sn-doped LNMO materials after 350 cycles at 0.7C are 93.5% and 94.5%, respectively, significantly higher than the undoped 80.8%, indicating that in-situ Sn doping can significantly enhance cycle performance. This study demonstrates that the LiNi0.5Mn1.46O0.04 electrode prepared by spray drying method, with its simple and straightforward synthesis process and excellent electrochemical performance, has the potential to become a high-performance lithium-ion batteries cathode material. © 2024 IEEE.

关键词： Lithium-ion batteries

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