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Synergistic Regulation of Texture and Low-Angle Grain Boundaries Enables Mechanically Robust P-Type Bi2Te3- Based Compounds with Superior Thermoelectric Performance

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SSRN 2024年

作者： Chen, Shuo Luo, Tingting Li, Junjie Liao, Lin Liu, Yutian Yang, Zhen Zhong, Shenlong Wu, Jinsong Su, Xianli Yan, Yonggao Poudeu, Pierre Ferdinand Poudeu Zhang, Qingjie Tang, Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering University of Michigan at Ann Arbo Ann ArborMI48109 United States

Structural material parameters such as grain size, texture, and grain boundary species play crucial roles in anisotropic thermoelectric materials. In this study, the underlying mechanism for rational regulation of grain size, texture, and grain boundary species is uncovered. The variations in the plastic deformation capability and the atomic diffusion rates at different extrusion temperatures lead to a competition between dynamic recrystallization (DRX) and grain growth, which allows for quantitative regulation over grain size, texture, and low-angle grain boundaries (LAGBs) in the material. As a result, grain size can be effectively tuned from the nanometer scale to the micrometer scale, with the orientation factor F(110) adjusting from 0.23 to 0.41, and the concentration of LAGBs varying between 10.9% and 25.2%. The sample extruded at 673 K exhibits an average grain size of 800 nm, which contribute to the observed compressive strength of 226 MPa and bending strength of 126 MPa. Additionally, the high texture and high density of LAGBs ensure a high carrier mobility of 247 cm2 V-1 s-1. The ZT value of 1.2 enables micro-TEC modules and conventional TEC modules to achieve maximum temperature differences (ΔTmax) of 60 K and 78 K, respectively, at the hot-side temperature of 300 K. © 2024, The Authors. All rights reserved.

关键词： Compressive strength

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Enhanced thermoelectric performance and atomic-resolution interfacial structures in BiSbTe thermo-electro-magnetic nanocomposites incorporating magnetocaloric LaFeSi nanoparticles

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Journal of Materiomics 2021年第5期7卷 998-1006页

作者： Lin Xing Wenjun Cui Xiahan Sang Fengxia Hu Ping Wei Wanting Zhu Xiaolei Nie Qingjie Zhang Wenyu Zhao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan430070China State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of SciencesBeijing100190China

Incorporating magnetic nanoparticles in thermoelectric(TE)materials introduce magnetic interfaces with additional electron and phonon scattering mechanism for high TE ***,the influence of heterogeneous interfaces between magnetic nanoparticles and TE matrix on electronic and thermal transport remains elusive in the thermo-electric-magnetic ***,using p-type TE material Bi_(0.3)Sb_(1.7)Te_(3)(BST)as matrix and magnetocaloric(MC)material La(Fe_(0.92)Co_(0.08))_(11.9)Si_(1.1)(LFS)nanoparticles as a second phase,TE/MC nanocomposites xLFS/BST(x=0.1%,0.2%,0.3% and 0.4%)were synthesized using spark plasma sintering *** atomic-resolution interfacial structures demonstrate that Te vacancies originating from LFS-BST interfacial reaction decreases the hole concentration of the LFS/BST nanocomposites and enhances the Seebeck *** LFS/BST nanocomposites exhibit lower thermal conductivity due to enhanced phonon scattering by interfaces and *** the nanocomposites have higher ZT than BST matrix,with 0.2% LFS/BST nanocomposite achieving highest ZT=1.11 at 380 *** working current 1.4 A,the device fabricated using 0.2% LFS/BST nanocomposite achieves maximal cooling temperature 4.9 K,which is 58% higher than the ***,the MC properties are retained in all the nanocomposites,which make them a promising candidate to achieve high TE performance and dual TE/MC properties for future applications.

关键词： Thermoelectrics Magnetocaloric materials Bi_(2)Te_(3)La(Fe,Si)_(13) Microstructure Thermoelectric properties

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A Strategy to Reduce the Peak Temperature of the Chip Working under Dynamic Power Using the Transient Cooling Effect of the Thin-Film Thermoelectric Cooler

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Journal of Thermal Science 2022年第4期31卷 1094-1105页

作者： WU Yongjia CHEN Sen GONG Tingrui SHI Tianhao ZUO Lei YAN Yonggao FANG Yueping MING Tingzhen School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Microsystem&Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200China Department of Mechanical Engineering Virginia TechBlacksburgVA 24060USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Energy Construction and Environment Coventry UniversityCoventry CV15FBUK

The thin-film thermoelectric cooler(TEC)is a promising solid-state heat pump that can remove the high local heat flux of chips utilizing the Peltier *** an electric current pulse is applied to the thin-film TEC,the TEC can achieve an instantaneous lower temperature compared to that created by a steady *** this paper,we developed a novel strategy to reduce the peak temperature of the chip working under dynamic power,thus making the semiconductor chip operate reliably and efficiently.A three-dimensional numerical model was built to study the transient cooling performance of the thin-film TEC on *** effects of parameters,such as the current pulse,the heat flux,the thermoelement length,the number of thermoelements,and the contact resistance on the performance of the thin-film TEC,were *** results showed that when a current pulse of 0.6 A was applied to the thin-film TEC before the peak power of the chip,the peak temperature of the chip was reduced by more than 10℃,making the thin-film thermoelectric cooler a promising technology for the temperature control of modern chips with high peak powers.

关键词： temperature control transient cooling thermoelectric cooler heat transfer

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Planar metasurface‑based concentrators for solar energy harvest:from theory to engineering

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PhotoniX 2022年第1期3卷 38-72页

作者： Cheng Zhang Yujie Zhan Yongxue Qiu Leilei Xu Jianguo Guan Hubei Engineering Research Center of RF‑Microwave Technology and Application School of ScienceWuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Solar energy is an inexhaustible renewable energy resource,which is a potential solution to global warming and aids sustainable *** use of solar-thermal collectors to harness solar energy facilitates low-cost heat storage and can improve the stability of power grids based on renewable *** solar-thermal collectors,traditional concentrators,such as parabolic troughs and dishes,are typically used but inevitably require high-precise supports and complex tracking sun systems,which increase the cost of solar-thermal power stations and hinder their further *** contrast,planar meta-lenses(so-called metasurface-based concentrators)consisting of two-dimensional nanostructured arrays are allowed to engineer the frequency dispersion and angular dispersion of the incident light through delicately arranging the aperture phase distribution,thereby correcting their inherent ***,the novel meta-lenses offer tremendous potentials to effectively capture broadband,wide-angle sunlight without the extra tracking *** review summarizes the research motivation,design principles,building materials,and large-area fabrication methods of meta-lens for solar energy harvesting in terms of focusing efficiency,operation bandwidth,and angular *** addition,the main challenges and future goals are examined.

关键词： Solar-thermal collector Metasurface Concentrator Solar energy harvesting

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Progress and perspectives in dielectric energy storage ceramics

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Journal of advanced Ceramics 2021年第4期10卷 675-703页

作者： Dongxu LI Xiaojun ZENG Zhipeng LI Zong-Yang SHEN Hua HAO Wenqin LUO Xingcai WANG Fusheng SONG Zhumei WANG Yueming LI Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Chengdu Hongke Electronic Technology Co. Ltd.Chengdu 610000China

Dielectric ceramic capacitors,with the advantages of high power density,fast chargedischarge capability,excellent fatigue endurance,and good high temperature stability,have been acknowledged to be promising candidates for solid-state pulse power *** review investigates the energy storage performances of linear dielectric,relaxor ferroelectric,and antiferroelectric from the viewpoint of chemical modification,macro/microstructural design,and electrical property *** progress of ceramic bulks and films for Pb-based and/or Pb-free systems is ***,we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.

关键词： energy storage ceramics dielectric relaxor ferroelectric antiferroelectric pulse power capacitor

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Influence of pore size optimization in catalyst layer on the mechanism of oxygen transport resistance in PEMFCs

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Progress in Natural Science:materials International 2020年第6期30卷 839-845页

作者： Shumeng Guan Fen Zhou Jinting Tan Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cells Wuhan University of Technology

In PEMFC, the oxygen transport resistance severely hinders the cell from achieving high performance. In this paper, pore-forming agent was used to optimize the pore size distribution of the catalyst layer(CL), and to study its effect on the mechanism of oxygen transport resistance, including molecular diffusion resistance, Knudsen diffusion resistance, and local O2resistance in CL. The results showed that with the pore formation the cell performance had a significant improvement at high current density, mainly due to its better oxygen transport properties, especially under low platinum conditions. The addition of pore-forming agent moved the pore diameter toward a larger pore diameter with a range from 70 to 100 nm, and also obtaining a higher cumulative pore volume. It was found that the increase of the cumulative pore volume and larger pore size were conducive to the diffusion of oxygen molecules in CL, and the resistance caused by which was the dominant part in total transport resistance. Further tests indicated that the improvement of molecular diffusion resistance was much larger than that of Knudsen diffusion resistance in the catalyst layer after pore formed. In addition, the optimized pore structure will also get a higher number of effective pores, which resulted in an increased effective area of the ionomer on the Pt surface. The higher effective area of the ionomer was particularly beneficial for the reduction of local O2resistance with low Pt loading.

关键词： Pore size optimization Pore-forming agent Oxygen transport resistance PEMFC

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Large-scale manufacturing sulfide superionic conductor for advancing all-solid-state batteries

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Matter 2025年

作者： Wang, Shuo Lou, Chenjie Wu, Xinbin Lin, Jing Gautam, Ajay Li, Shenghao Huang, Jielei Cheng, Zhu Zhang, Shengnan Zhang, Xin Strauss, Florian Brezesinski, Torsten Luo, Guoqiang Tang, Mingxue Shen, Yang Lin, Yuanhua Nan, Ce-Wen Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Kaiserstr. 12 Karlsruhe76131 Germany Department of Radiation Science and Technology Delft University of Technology JB Delft2629 Netherlands

Lithium argyrodites with high ionic conductivities are favorable solid electrolytes (SEs) for all-solid-state batteries (ASSBs). However, their low preparation efficiency and poor cycling performance hinder their large-scale applications. In this work, we demonstrate successful large-scale production (over 1 kg per batch for the first time) of Li5.5PS4.5Cl0.75Br0.75 (LPSCB) by fast dry mixing followed by annealing, which presents high room temperature ionic conductivities of 13 mS cm−1 for cold-pressed and 25 mS cm−1 for sintered pellets. Combining neutron powder diffraction and 6Li → 7Li tracer-exchange nuclear magnetic resonance (NMR) spectroscopy measurements, we show that intercage jumps frequently occur through the 48h-16e-48h pathway in LPSCB, promoting the overall lithium conduction. The assembled ASSBs using LPSCB and a LiNi0.83Co0.11Mn0.06O2 electrode can be cycled for over 2,500 cycles at a 0.5 C rate and 1,800 cycles at a 2 C rate without any capacity degradation. Our results will accelerate the commercialization of sulfide SE for ASSBs. © 2025 Elsevier Inc.

关键词： Neutron powder diffraction

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Maximum Power Point Tracking Using a Multimode Hunter-Prey Optimization Algorithm for Gradually Varying Power in Centralized Thermoelectric Generation System

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Energy technology 2025年第0期

作者： Zhu, Wenchao Li, Peng Yang, Wenlong Xie, Changjun Li, Hao Yang, Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan430070 China School of Automation Wuhan University of Technology Wuhan430070 China Wuhan Industrial Technology Institute of Artificial Intelligence and New Energy Vehicles Wuhan430119 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

The unstructured power outputs from thermoelectric generator (TEG) systems have precipitated the advancement of maximum power point tracking (MPPT) methods toward more intelligent solutions. This article concentrates on centralized TEG systems which work during nonuniform distribution of temperature cases and introduce the hunter-prey optimization algorithm with multimode updating (MMUHPO). Existing MPPT methods based on metaheuristic algorithms pay attention to improving tracking speed, efficiency, oscillation, and call frequency. However, in scenarios marked by gradual changes in power characteristics, the precision of MPPT algorithms can lead to frequent oscillatory searches and elevated computational demands. MMUHPO reduces power loss and simplifies algorithm complexity by improving the original mechanism and introducing termination mechanism and multimode update mechanism. Herein, the proposed algorithm is compared with several widely used MPPT algorithms based on metaheuristic algorithms under five different operating conditions. Remarkably, the MMUHPO algorithm demonstrates a substantial enhancement in energy collection efficiency, with the increase in efficiency reaching up to 109.8%. Finally, real-time data simulation experiments corroborate the exceptional tracking performance of the proposed algorithm. © 2025 Wiley-VCH GmbH.

关键词： Heuristic algorithms

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

SSRN

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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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Tailoring Microstructure and Mechanical Property of Pure Tungsten Via Laser Powder Bed Fusion

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SSRN 2023年

作者： Xiong, Zhengang Ma, Wenyou Deng, Zhaoyang Yu, Chunfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China

Microstructure tailoring is a fascinating project for material scientists that enables the mechanical properties of metallic parts to be customized. In this study, a series of laser parameter settings were implemented to manufacture dense tungsten parts and three laser travelling strategies were developed to tailor the microstructure via laser powder bed fusion (LPBF). A novel brick-stacking structure and interlocked S-shaped grains were observed in these dense samples. Among different strategy tungsten builds, typical indentation size effect (ISE) was found based on the indentation responses. As-measured indentation hardness could be thought of the sum of contribution from surface and volume. Although their ISE was similar, the contribution from plastically volume work varied, which could be primarily interpreted by rotation strategy. The rotation strategy significantly reduced the grain size and thermal stress during laser manufacturing, resulting in higher true hardness (~ 3.5 GPa). Additionally, the compression properties and associated fracture behavior of tungsten specimens manufactured by the different strategies were also compared. Therefore, these findings show that controlling laser travelling strategy during the LPBF process could be a powerful avenue to tailor the microstructure and performance of the customized components. © 2023, The Authors. All rights reserved.

关键词： Hardness

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