Triple-phase ceramic 2D nanocomposite with enhanced thermoelectric properties
| Autor: | Frank Steinbach, Kjell Wiik, Michael Bittner, Nikola Kanas, Richard Hinterding, Dennis Groeneveld, Mari-Ann Einarsrud, Piotr Wemhoff, Armin Feldhoff |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Nanocomposite 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Thermoelectric generator Electrical resistivity and conductivity Seebeck coefficient visual_art Phase (matter) 0103 physical sciences Thermoelectric effect Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Charge carrier Ceramic Composite material 0210 nano-technology |
| Zdroj: | 1237-81244 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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