Triple-phase ceramic 2D nanocomposite with enhanced thermoelectric properties |
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| Affiliation: | 1. Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, DE-30167 Hannover, Germany;2. Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Sem Saelands vei 12, N-7491 Trondheim, Norway;1. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea;2. School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 330-708, Republic of Korea;3. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul 13679, Republic of Korea;4. Department of Advanced Materials & Chemical Engineering, Halla University, Wonju, Kangwon 220-712, Republic of Korea;1. Department of Mechanical and Aerospace Engineering, West Virginia University, Evansdale Drive, Morgantown, WV 26506, USA;2. National Energy Technology Laboratory, 3610 Collins Ferry Road, Morgantown, WV 26507, USA;1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;2. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Beijing 100029, China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China;4. School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China |
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| Abstract: | A thermoelectric triple-phase p-type Ca3Co4O9-NaxCoO2-Bi2Ca2Co2O9 (CCO–NCO–BCCO) 2D nanocomposite was obtained from pressureless sintering in air. The anisotropic thermoelectric properties of the nanocomposite exhibit a high electrical conductivity of 116 S cm?1 and a power factor of 6.5 μW cm?1 K?2 perpendicular to the pressing direction at 1073 K in air. A corresponding zT value of 0.35 was obtained. Three co-doped, thermoelectrically active misfit-layered materials were stacked to form a triple-phase nanocomposite, which combines the advantages of all three materials. The resulting nanocomposite enables simultaneous increases of the isothermal electrical conductivity σ and the Seebeck coefficient α by charge carrier concentration engineering and synergistic effects. The Bi2Ca2Co2O9 and NaxCoO2 phases were stabilized in a Ca3Co4O9 matrix at high temperatures. To evaluate the application of the nanocomposite in high-temperature thermoelectric generators, the representation of the electrical conductivity and power factor in a Ioffe plot was more appropriate than the zT value. |
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| Keywords: | Thermoelectricity All-scale hierarchical architecture 2D nanostructures Nanocomposite |
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