Details
| Original language | English |
|---|---|
| Pages (from-to) | 1237-1244 |
| Number of pages | 8 |
| Journal | Journal of the European Ceramic Society |
| Volume | 39 |
| Issue number | 4 |
| Early online date | 3 Nov 2018 |
| Publication status | Published - Apr 2019 |
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.
Keywords
- 2D nanostructures, All-scale hierarchical architecture, CaCoO, Nanocomposite, Thermoelectricity
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the European Ceramic Society, Vol. 39, No. 4, 04.2019, p. 1237-1244.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Triple-phase ceramic 2D nanocomposite with enhanced thermoelectric properties
AU - Bittner, Michael
AU - Kanas, Nikola
AU - Hinterding, Richard
AU - Steinbach, Frank
AU - Groeneveld, Dennis
AU - Wemhoff, Piotr
AU - Wiik, Kjell
AU - Einarsrud, Mari Ann
AU - Feldhoff, Armin
N1 - Funding information: This work has been funded by the Deutsche Forschungsgesellschaft (DFG, German Research Foundation) – FE928/17-1. Financial support from The Research Council of Norway is appreciated under the program Nano2021 to the project (Number 228854) “Thermoelectric materials: Nanostructuring for improving the energy efficiency of thermoelectric generators and heat-pumps” (THELMA). Thanks are to the E.ON Stipendienfonds (T0087 – ESF) for financing the academic exchange between the Norwegian University for Science and Technology (NTNU) and the Gottfried Wilhelm Leibniz University Hannover.
PY - 2019/4
Y1 - 2019/4
N2 - 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.
AB - 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.
KW - 2D nanostructures
KW - All-scale hierarchical architecture
KW - CaCoO
KW - Nanocomposite
KW - Thermoelectricity
UR - http://www.scopus.com/inward/record.url?scp=85056457922&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.10.023
DO - 10.1016/j.jeurceramsoc.2018.10.023
M3 - Article
AN - SCOPUS:85056457922
VL - 39
SP - 1237
EP - 1244
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 4
ER -