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Enhanced thermoelectric composite performance from mesoporous carbon additives in a commercial Bi_(0.5)Sb_(1.5)Te_(3) matrix

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Journal of materials Science & Technology 2021年第35期94卷 175-182页

作者： Seong-Tae Kim Jong Min Park Kwi-Il Park Sang-Eun Chun Ho Seong Lee Pyuck-Pa Choi Seonghoon Yi School of materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Composites were prepared,through hot pressing,using carbon materials with different pore size distributions as additives for commercial Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material(BST,p-type).thermoelectric properties of the composites were measured in a temperature range of 298-473 *** conductivity of the composites,especially lattice thermal conductivity,was effectively decreased due to the mesoporous properties of the incorporated carbon *** electrical conductivity of the composites slightly decreased due to the electron scattering at the interface between the carbon material and the commercial BST *** composite with 0.2 vol.%mesoporous carbon powder(36%mesoporosity)exhibited a figure of merit value approximately 10.7%higher than that of commercial BST without *** behavior resulted in 116%improved output power in the composite block-based single element compared with a bare BST thermoelectric *** enhanced figure of merit was attributed to the effective reduction of lattice thermal conductivity by acoustic phonons scattering at the interface between the BST matrix and the mesoporous carbon as well as at the pore surfaces within the mesoporous *** utilizing mesoporous carbon materials used in this study,the shortcomings and economic difficulties of the composite process with low dimensional carbon additives(carbon nanotubes,graphene,and nanodiamond)can be overcome for extensive practical *** carbon powder with a tailored porosity distribution revealed the validity of bulk-type carbon additives to enhance the figure of merit of commercial thermoelectric materials.

关键词： thermoelectric material Bi_(0.5)Sb_(1.5)Te_(3) Mesoporous carbon Lattice thermal conductivity Figure of merit

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Sn-based type-VIII single-crystal clathrates with a large figure of merit

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Chinese Physics B 2012年第1期21卷 462-466页

作者： Deng Shu-Kang Li De-Cong Shen Lan-Xian Hao Rui-Ting T.Takabatake Key Laboratory of Advanced Technique&Preparation for Renewable Energy materials of Ministry of Education Solar Energy Research Institute Yunnan Normal UniversityKunming 650092China Department of Quantum Matter ADSM and IAMR Hiroshima UniversityHigashi-Hiroshima 739-8530Japan

Single-crystal samples of type-VIII BasGa16-xCuxSn30 （x = 0, 0.03, 0.06, 0.15） clathrates were prepared using the Sn-flux method. At room temperature the carrier density, n, is 3.5-5 × 10^19 cm^-3 for all the samples, the carrier mobility, μH, increases to more than twice that of BasGa16Sn30 for all the Cu doping samples, and consequently the electrical conductivity is enhanced distinctly from 1.90×10^4 S/m to 4.40 ×10^4 S/m, with the Cu composition increasing from x = 0 to x = 0.15. The Seebeck coefficient,α, decreases slightly with the increases in Cu composition. The values are about 0.72 W/mK at 300 K and are almost invariant with temperature up to 500 K for the samples with x = 0 and x = 0.03. The lattice thermal conductivity, μL, decreases from 0.59 W/InK for x = 0 to 0.50 W/mK for x = 0.03 at 300 K. The figure of merit for x = 0.03 reaches 1.35 at 540 K.

关键词： thermoelectric material type-VIII clathrate thermoelectric properties

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Impacts of cone-structured interface and aperiodicity on nanoscalethermal transport in Si/Gesuperlattices

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Frontiers in Energy 2018年第1期12卷 137-142页

作者： Pengfei JI Yiming RONG Yuwen ZHANG Yong TANG Department of Mechanical and Energy Engineering Southern Uni-versity of Science and Technology Shenzhen 518055 China Department of Mechanical and Aerospace Engineering University ofMissouri Columbia MO 65211 USA Key-Laboratory of Surface Functional Structure Manufacturing ofGuangdong Higher Education Institutes School of Mechanical andAutomotive Engineering South China University of TechnologyGuangzhou 510640 China

Si/Gesuperlattices are promising thermoelec- tric materials to convert thermal energy into electric power. The nanoscale thermal transport in Si/Gesuperlattices is investigated via molecular dynamics （MD） simulation in this short communication. The impact of Si and Ge interface on the cross-plane thermal conductivity reduction in the Si/Gesuperlattices is studied by designing cone- structured interface and aperiodicity between the Si and Ge layers. The temperature difference between the left and right sides of the Si/Gesuperlattices is set up for none- quilibrium MD simulation. The spatial distribution of temperature is recorded to examine whether the steady- state has been reached. As a crucial factor to quantify thermal transport, the temporal evolution of heat flux flowing through Si/Gesuperlattices is calculated. Com- pared with the even interface, the cone-structured interface contributes remarkable resistance to the thermal transport, whereas the aperiodic arrangement of Si and Ge layers with unequal thicknesses has a marginal influence on the reduction of effective thermal conductivity. The interface with divergent cone-structure shows the most excellent performance of all the simulated cases, which brings a 33% reduction of the average thermal conductivity to the other Si/Gesuperlattices with even, convergent cone-structured interfaces and aperiodic arrangements. The design of divergent cone-structured interface sheds promising lighton enhancing the thermoelectric efficiency of Si/Ge based materials.

关键词： thermoelectric material thermal transport Si/Gesuperlattics molecular dynamics (MD)

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Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3

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Journal of Advanced Ceramics 2020年第4期9卷 424-431页

作者： Xiaolei Shi Xin Ai Qihao Zhang Xiaofang Lu Shijia Gu Li Su Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China College of Information Science and Technology Donghua UniversityShanghai201620China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Institute of Functional materials Donghua UniversityShanghai201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai201620China

N-type Se&Lu-codoped Bi2Te3 nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense *** further doping Se element into Lu-doped Bi2Te3 samples,the thickness of the nanosheets has the tendency to become *** electrical conductivity of Lu0.1Bi1.9Te3−xSex material is reduced with the increasing Se content due to the reduced carrier concentration,while the Seeback coefficient values are *** lattice thermal conductivity of the Lu0.1Bi1.9Te3−xSex is greatly reduced due to the introduced point defects and atomic mass ***,the Lu0.1Bi1.9Te2.7Se0.3 sample obtained a maximum ZT value of 0.85 at 420 *** study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3 with high thermoelectric performance for practical applications.

关键词： thermoelectric material n-type bismuth telluride hydrothermal synthesis co-doping

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Electric and mechanical performances of Bi_(0.5)Sb_(1.5)Te_(3) prepared by spark plasma sintering

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Rare Metals 2006年第z2期25卷 227-231页

作者： XIAO Bo CHEN Hui WU Borong ZHU Lei LIU Mingyi JIAN Xuyu LI Lin Energy materials and Technology Research Institute General Research Institute for Non-ferrous MetalsBeijing 100088China Tianjin Institute of Power Sources Tianjin 300381China

thermoelectric(TE)materials are a kind of functional materials which can be used to convert directly heat energy to electricity or *** thermoelectric effects hold great potential for application in power generation and ***_(2)Te_(3)and its alloys are well known as best TE materials currently available near room *** paper studies respectively the effects of spark plasma sintering(SPS)on electric performance of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric materials that are prepared through vacuum melting and ball *** X-ray Diffraction and cold field emission scanning electric microscope s4800,the phase constituent and microstructure of the TE materials samples were *** conductivity and power factor can be improved with the rise of Spark Plasma Sintering temperature(from 300 to 500℃)and pressure(from 30 to 60 MPa),and the density and mechanical strength of Bi_(0.5)Sb_(1.5)Te_(3)thermoelectric material increase,too.

关键词： thermoelectric material spark plasma sintering electric conductivity

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Frictionless Multi-field Coupling Contact Problem for a thermoelectric Layer Loaded by Two Rigid Punches

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Acta Mechanica Solida Sinica 2023年第2期36卷 282-292页

作者： Yali Zhang Hailiang Ma Juan Yang Shenghu Ding School of Mathematics and Statistics Ningxia UniversityYinchuan 750021China School of Ethnic Preparatory Education Ningxia UniversityYinchuan 750021China

In this paper,the thermo-electro-mechanical coupling contact problem of thermoelectric material with double punches is analyzed *** the Fourier cosine transform technique,the thermo-electro-elastic problem is transformed into three sets of singular integral equations,which are numerically solved by the Gauss–Chebyshev integral formula according to the unknown normal electric current density,normal energy flux and normal contact *** a rigid flat indenter,the results can be covered by the degradation results of two rigid flat *** numerical results reveal the interaction between two punches and the effect of thermoelectric load on the indentation *** interaction between the two punches reduces the contact pressure at the inner edge of the indenter as the thermoelectric load increases while increasing the stress singularity at the outer *** change of punches’spacing makes the singularity of normal stress at the inner and outer edges *** results provide an in-depth understanding of the multi-region contact damage mechanism of thermoelectric material.

关键词： thermoelectric material Two rigid punches Interaction Analytical solutions

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thermoelectric properties of n-type SiGe alloys with Sn incorporation

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Rare Metals 2022年第12期41卷 4156-4163页

作者： Ke Meng La-Mei Zhao Ning-Yuan Zhang Zhuang-Fei Zhang Wei-Xia Shen Yue-Wen Zhang Biao Wan Chao Fang Liang-Chao Chen Qian-Qian Wang Ju-Long He Xiao-Peng Jia Key Laboratory of material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Metastable materials Science and Technology Yanshan UniversityQinhuangdao 066004China

In the past several decades,silicon germanium(SiGe)bulk alloys have been a research focus in addressing the current global energy crisis and environmental pollution problems due to their excellent high-temperature thermoelectric *** this study,n-type Si_(80)Ge_(20)P_(2)Sn_(x)bulk alloys were fabricated by spark plasma sintering(SPS)to investigate the effect of Sn *** addition,the optimal sintering conditions and Sn content were *** introduction of Sn improves the electrical conductivity and power factor of the n-type SiGe bulk alloys due to the doping and composite ***,the Si_(80)Ge_(20)P_(2)Sn_(2)bulk alloy could reach a high figure of merit(ZT)value of~1.26 at 800℃.Thus,this work provides a quick preparation method for obtaining n-type SiGe bulk alloys with outstanding thermoelectric properties by incorporating Sn,which is favorable for large-scale production.

关键词： thermoelectric material Spark plasma sintering(SPS) Silicon germanium alloy Composite

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Improving electrical and thermal properties synchronously via introducing CsPbBr_(3)QDs into higher manganese silicides

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Journal of materials Science & Technology 2022年第16期111卷 279-286页

作者： Qing Wang Zhiliang Li Xiaofeng Yang Xin Qian Linjuan Guo Jianglong Wang Dan Zhang Shu-Fang Wang Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding 071002China Hebei Key Lab of Optic-Electronic Information and materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Higher manganese silicide(HMS)is a P-type medium temperature thermoelectric(TE)material,which has attracted widespread attention over the past few decades due to its remarkable mechanical properties,excellent chemical and thermal stability,as well as the non-toxicity,abundance and competitive *** peak power factor(PF)of HMS is as high as~1.50×10^(-3)W m^(-1)K^(-2)because of its intrinsic high electrical conductivity and Seebeck ***,the thermal conductivity of HMS is also high,resulting in relatively low z T *** nano-dispersion in the matrix is one of the most effective methods to enhance the TE properties via reducing the lattice thermal conductivity significantly without drastic changes on the other *** this study,Cs Pb BrQDs with uniform size were synthesized and introduced into HMS *** PF(at 823 K)was enhanced to 1.71×10^(-3)W m^(-1)K^(-2),which is improved 14.0%approximately compared with that of pure HMS owing to the combined effect of element doping and energy *** lattice thermal conductivity(at 823 K)decreased from 2.56W mKto 1.99 W mKsynchronously(~22.0%)due to the intensive phonon scattering caused by Cs doping,and the embedding of Pb riched CsPbBr_(3)QDs and Pb QDs.A maximum z T value of 0.57(823 K)is achieved in Cs Pb BrQDs/HMS composites,which is 36.0%higher than that of pure ***,for other TE materials,it is also feasible to improve the TE properties via introducing metastable quantum dots.

关键词： thermoelectric material Higher manganese silicide Quantum dot Figure of merit Inclusion

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Realizing high thermoelectric performance via selective resonant doping in oxyselenide BiCuSeO

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Nano Research 2023年第1期16卷 1679-1687页

作者： Yue-Xing Chen Wenning Qin Adil Mansoor Adeel Abbas Fu Li Guang-xing Liang Ping Fan Muhammad Usman Muzaffar Bushra Jabar Zhen-hua Ge Zhuang-hao Zheng F1 Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Faculty of materials and Manufacturing Beijing University of TechnologyBeijing 100124China International Center for Quantum Design of Functional materials(ICQD) Hefei National Laboratory for Physical Sciences at Microscale(HFNL)and CAS Center for Excellence in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Faculty of materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Tuning the charge carrier concentration is imperative to optimize the thermoelectric(TE)performance of a *** BiCuSeO based oxyselenides,doping efforts have been limited to optimizing the carrier *** the present work,dual-doping of In and Pb at Bi site is introduced for p-type BiCuSeO to realize the electric transport channels with intricate band characteristics to improve the power factor(PF).Herein,the impurity resonant state is realized via doping of resonant dopant In over Pb,where Pb comes forward to optimize the Fermi energy in the dual-doped BiCuSeO system to divulge the significance of complex electronic *** manifold roles of dual-doping are used to adjust the elevation of the PF due to the significant enhancement in electrical ***,the combined experimental and theoretical study shows that the In/Pb dual doping at Bi sites gently reduces bandgap,introduces resonant doping states with shifting down the Fermi level into valence band(VB)with a larger density of state,and thus causes to increase the carrier concentration and effective mass(m*),which are favorable to enhance the electronic transport *** a result,both improved ZTmax=0.87(at 873 K)and high ZTave=0.5(at 300–873 K)are realized for InyBi(1−x)−yPbxCuSeO(where x=0.06 and y=0.04)*** obtained results successfully demonstrate the effectiveness of the selective dual doping with resonant dopant inducing band manipulation and carrier engineering that can unlock new prospects to develop high TE materials.

关键词： thermoelectric material BiCuSeO dual-doping power factor figure of merit

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Macro-performance of multilayered thermoelectric medium

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Chinese Physics B 2017年第12期26卷 498-503页

作者：宋坤宋豪鹏高存法 State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics&AstronauticsNanfing 21O016China

The effective properties of thermoelectric composites are well known to depend on boundary conditions, which causes the macro performance of thermoelectric composite to be difficult to assess. The overall macro-performance of multilayered thermoelectric medium is discussed in this paper. The analytical solutions are obtained, including the heat flux, temperature, electric potential, and the overall energy conversion efficiency. The results show that there are unique relationships between the temperature/electric potential and the electric current/energy flux in the material, and whether the material is independent of or embedded in thermoelectric composites. Besides, the Peltier effect at the interface can significantly improve the overall energy conversion efficiency of thermoelectric composites. These results provide a powerful tool to analyze the effective behaviors of thermoelectric composites.

关键词： multi-layered thermoelectric material conversion efficiency Peltier effect heat flux electric energy

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