Enhanced thermoelectric properties of CNT dispersed and Na-doped Bi2Ba2Co2Oy composites |
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| Affiliation: | 1. Key Laboratory of Material Physics of Ministry of Education, and School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China;2. School of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China;1. GIK Institute of Engineering Sciences and Technology, Topi, Swabi, KPK 23640, Pakistan;2. Center for Innovative Development of Science and New Technologies of Academy of Sciences, Rudaki Ave.33, Dushanbe 734025, Tajikistan;3. Department of Physics, Government College of Science, Wahdat Road, Lahore 54570, Pakistan;4. Electrical and Computer Engineering Department, Nano Technology Program, University of Waterloo, Canada;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China;2. Department of Materials Science and Engineering, Institute of Space Technology (IST), Islamabad 44000, Pakistan;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China;4. Department of Engineering Mechanics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, People’s Republic of China;1. ICMA (CSIC-Universidad de Zaragoza), Dpto. de Ciencia de Materiales, C/María de Luna 3, 50018 Zaragoza, Spain;2. i3N, Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal;3. Universidad de Zaragoza, Dpto. de Ingeniería de Diseño y Fabricación, C/María de Luna 3, 50018 Zaragoza, Spain;1. Lab for Thin Films Nanosystems and Nanometrology, Physics Department, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece;2. Leibniz-Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany;1. Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea;2. Department of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;3. Department of Chemical Engineering and Research Center of Chemical Technology, Hankyong National University, Anseong 17579, Republic of Korea;1. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA;2. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA |
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| Abstract: | The thermoelectric properties of Bi2Ba2Co2Oy and Bi1.975Na0.025Ba2Co2Oy+x wt% carbon nanotubes (CNT; x=0.00, 0.05, 0.10, 0.15, 0.5, and 1.0) ceramic samples synthesised by the solid-state reaction method were investigated from 300K to 950K. Na doping with a small amount played an important role in reducing resistivity and slightly reduced the Seebeck coefficients and the thermal conductivity. The CNT dispersant increased resistivity, but the thermal conductivity was reduced remarkably. In particular, the Bi1.975Na0.025Ba2Co2Oy+1.0wt% CNT sample exhibited an ultralow thermal conductivity of 0.39 W K?1 m?1 at 923K. This was attributed to the point defects caused by Na doping and the interface scattering caused by the CNT dispersant. The combination of Na doping and CNT dispersion had better effects on thermoelectric properties. The Bi1.975Na0.025Ba2Co2Oy+0.5wt% CNT sample exhibited a better dimensionless figure of merit (ZT) value of 0.2 at 923K, which was improved by 78.2%, compared with the undoped Bi2Ba2Co2Oy sample. |
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| Keywords: | CNT dispersant Na doping Thermoelectric properties |
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