Details
| Original language | English |
|---|---|
| Pages (from-to) | 1170-1181 |
| Number of pages | 12 |
| Journal | Journal of the American Ceramic Society |
| Volume | 106 |
| Issue number | 2 |
| Early online date | 8 Oct 2022 |
| Publication status | Published - 8 Dec 2022 |
Abstract
Oxide-based ceramics offer promising thermoelectric (TE) materials for recy-
cling high-temperature waste heat, generated extensively from industrial
sources. To further improve the functional performance of TE materials, their
power factor should be increased. This can be achieved by nanostructuring and
texturing the oxide-based ceramics creating multiple interphases and nanopores,
which simultaneously increase the electrical conductivity and the Seebeck coef-
ficient. The aim of this work is to achieve this goal by compacting electrospun
nanofibers of calcium cobaltite Ca3 Co 4−xO 9+δ, known to be a promising p-type
TE material with good functional properties and thermal stability up to 1200 K
in air. For this purpose, polycrystalline Ca3 Co 4−xO 9+δ nanofibers and nanorib-
bons were fabricated by sol–gel electrospinning and calcination at intermediate
temperatures to obtain small primary particle sizes. Bulk ceramics were formed
by sintering pressed compacts of calcined nanofibers during TE measurements.
The bulk nanofiber sample pre-calcined at 973 K exhibited an improved Seebeck
coefficient of 176.5 S cm−1 and a power factor of 2.47 μW cm−1 K−2 similar to an
electrospun nanofiber-derived ceramic compacted by spark plasma sintering.
Keywords
- electron microscopy, electrospinning, microstructure, 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. 106, No. 2, 08.12.2022, p. 1170-1181.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electrospun Ca3 Co4−xO9+δ nanofibers and nanoribbons: Microstructure and thermoelectric properties
AU - Kruppa, Katharina
AU - Maor, Itzhak I.
AU - Steinbach, Frank
AU - Beilin, Vadim
AU - Mann-Lahav, Meirav
AU - Wolf, Mario
AU - Grader, Gideon S.
AU - Feldhoff, Armin
N1 - Funding information: This work was financially supported by the Ministry of Science and Culture of Lower Saxony (MWK) in the frame of the Research Cooperation Lower Saxony?Israel. The work was supported by the Nancy & Stephan Grand Technion Energy Program (GTEP); GSG acknowledges the support of the Arturo Gruenbaum Chair in Materials Engineering. This research was supported by the Israeli Ministry of Energy as part of the scholarship's program for first to third degree students in the fields of energy.
PY - 2022/12/8
Y1 - 2022/12/8
N2 - AbstractOxide-based ceramics offer promising thermoelectric (TE) materials for recy-cling high-temperature waste heat, generated extensively from industrialsources. To further improve the functional performance of TE materials, theirpower factor should be increased. This can be achieved by nanostructuring andtexturing the oxide-based ceramics creating multiple interphases and nanopores,which simultaneously increase the electrical conductivity and the Seebeck coef-ficient. The aim of this work is to achieve this goal by compacting electrospunnanofibers of calcium cobaltite Ca3 Co 4−xO 9+δ, known to be a promising p-typeTE material with good functional properties and thermal stability up to 1200 Kin air. For this purpose, polycrystalline Ca3 Co 4−xO 9+δ nanofibers and nanorib-bons were fabricated by sol–gel electrospinning and calcination at intermediatetemperatures to obtain small primary particle sizes. Bulk ceramics were formedby sintering pressed compacts of calcined nanofibers during TE measurements.The bulk nanofiber sample pre-calcined at 973 K exhibited an improved Seebeckcoefficient of 176.5 S cm−1 and a power factor of 2.47 μW cm−1 K−2 similar to anelectrospun nanofiber-derived ceramic compacted by spark plasma sintering.
AB - AbstractOxide-based ceramics offer promising thermoelectric (TE) materials for recy-cling high-temperature waste heat, generated extensively from industrialsources. To further improve the functional performance of TE materials, theirpower factor should be increased. This can be achieved by nanostructuring andtexturing the oxide-based ceramics creating multiple interphases and nanopores,which simultaneously increase the electrical conductivity and the Seebeck coef-ficient. The aim of this work is to achieve this goal by compacting electrospunnanofibers of calcium cobaltite Ca3 Co 4−xO 9+δ, known to be a promising p-typeTE material with good functional properties and thermal stability up to 1200 Kin air. For this purpose, polycrystalline Ca3 Co 4−xO 9+δ nanofibers and nanorib-bons were fabricated by sol–gel electrospinning and calcination at intermediatetemperatures to obtain small primary particle sizes. Bulk ceramics were formedby sintering pressed compacts of calcined nanofibers during TE measurements.The bulk nanofiber sample pre-calcined at 973 K exhibited an improved Seebeckcoefficient of 176.5 S cm−1 and a power factor of 2.47 μW cm−1 K−2 similar to anelectrospun nanofiber-derived ceramic compacted by spark plasma sintering.
KW - electron microscopy
KW - electrospinning
KW - microstructure
KW - thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=85140228703&partnerID=8YFLogxK
U2 - 10.1111/jace.18842
DO - 10.1111/jace.18842
M3 - Article
VL - 106
SP - 1170
EP - 1181
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 2
ER -