Details
| Original language | English |
|---|---|
| Pages (from-to) | 7951-7965 |
| Number of pages | 15 |
| Journal | Journal of the American Ceramic Society |
| Volume | 107 |
| Issue number | 12 |
| Publication status | Published - 2 Oct 2024 |
Abstract
Sodium cobaltite (NaxCoO2) is one of the most renowned and thermoelectrically promising p-type cobalt oxide materials, showing exceptional performance in this domain. Nonetheless, its thermal instability in air renders it unsuitable for high-temperature applications such as energy harvesting from industrial waste heat. To utilize the beneficial properties of NaxCoO2, microscale NaxCoO2 template particles of significantly larger size were effectively embedded within a thermally stable Ca3Co4−yO9+δ–NaxCoO2–Bi2Ca2Co2O9 triple-phase matrix. This approach additionally aimed to enhance the texture and boost the thermoelectric performance of the ceramic composite. Highly textured p-type ceramic composites were fabricated via uniaxial cold-pressing and pressureless sintering in air. The unique hexagonal NaxCoO2 template particles, produced through molten-flux synthesis, allowed precise control over their shape and dimensions, while the matrix was synthesized via a sol–gel synthesis. The integrated NaxCoO2 particles of the textured composite exhibited increased thermal stability, showing no sign of decomposition at 1173 K in air, whereas the sole template particles decomposed at 1073 K during sintering. A 20 wt% template particle content in the textured composites resulted in a remarkably high and nearly temperature-independent power factor of 8.8 µW cm−1 K2, corresponding to an improvement of 13% compared to that of the pure matrix material.
Keywords
- ceramic matrix composites, electrical conductivity, oxides, thermoelectric properties
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the American Ceramic Society, Vol. 107, No. 12, 02.10.2024, p. 7951-7965.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Advanced thermoelectric performance of a textured ceramic composite
T2 - Encapsulation of NaxCoO2 into a triple-phase matrix
AU - Kruppa, Katharina
AU - Hennig, Tobias
AU - Escobar Cano, Giamper
AU - Möckelmann, Jytte
AU - Feldhoff, Armin
N1 - Publisher Copyright: © 2024 The Author(s). Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.
PY - 2024/10/2
Y1 - 2024/10/2
N2 - Sodium cobaltite (NaxCoO2) is one of the most renowned and thermoelectrically promising p-type cobalt oxide materials, showing exceptional performance in this domain. Nonetheless, its thermal instability in air renders it unsuitable for high-temperature applications such as energy harvesting from industrial waste heat. To utilize the beneficial properties of NaxCoO2, microscale NaxCoO2 template particles of significantly larger size were effectively embedded within a thermally stable Ca3Co4−yO9+δ–NaxCoO2–Bi2Ca2Co2O9 triple-phase matrix. This approach additionally aimed to enhance the texture and boost the thermoelectric performance of the ceramic composite. Highly textured p-type ceramic composites were fabricated via uniaxial cold-pressing and pressureless sintering in air. The unique hexagonal NaxCoO2 template particles, produced through molten-flux synthesis, allowed precise control over their shape and dimensions, while the matrix was synthesized via a sol–gel synthesis. The integrated NaxCoO2 particles of the textured composite exhibited increased thermal stability, showing no sign of decomposition at 1173 K in air, whereas the sole template particles decomposed at 1073 K during sintering. A 20 wt% template particle content in the textured composites resulted in a remarkably high and nearly temperature-independent power factor of 8.8 µW cm−1 K2, corresponding to an improvement of 13% compared to that of the pure matrix material.
AB - Sodium cobaltite (NaxCoO2) is one of the most renowned and thermoelectrically promising p-type cobalt oxide materials, showing exceptional performance in this domain. Nonetheless, its thermal instability in air renders it unsuitable for high-temperature applications such as energy harvesting from industrial waste heat. To utilize the beneficial properties of NaxCoO2, microscale NaxCoO2 template particles of significantly larger size were effectively embedded within a thermally stable Ca3Co4−yO9+δ–NaxCoO2–Bi2Ca2Co2O9 triple-phase matrix. This approach additionally aimed to enhance the texture and boost the thermoelectric performance of the ceramic composite. Highly textured p-type ceramic composites were fabricated via uniaxial cold-pressing and pressureless sintering in air. The unique hexagonal NaxCoO2 template particles, produced through molten-flux synthesis, allowed precise control over their shape and dimensions, while the matrix was synthesized via a sol–gel synthesis. The integrated NaxCoO2 particles of the textured composite exhibited increased thermal stability, showing no sign of decomposition at 1173 K in air, whereas the sole template particles decomposed at 1073 K during sintering. A 20 wt% template particle content in the textured composites resulted in a remarkably high and nearly temperature-independent power factor of 8.8 µW cm−1 K2, corresponding to an improvement of 13% compared to that of the pure matrix material.
KW - ceramic matrix composites
KW - electrical conductivity
KW - oxides
KW - thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=85202076714&partnerID=8YFLogxK
U2 - 10.1111/jace.20110
DO - 10.1111/jace.20110
M3 - Article
AN - SCOPUS:85202076714
VL - 107
SP - 7951
EP - 7965
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 12
ER -