Details
| Original language | English |
|---|---|
| Article number | 2304464 |
| Journal | Advanced functional materials |
| Volume | 33 |
| Issue number | 49 |
| Publication status | Published - 1 Dec 2023 |
Abstract
Calcium cobaltite Ca3Co4−xO9+δ (CCO) is a promising p-type thermoelectric (TE) material for high-temperature applications in air. The grains of the material exhibit strong anisotropic properties, making texturing and nanostructuring mostly favored to improve thermoelectric performance. On the one hand multitude of interfaces are needed within the bulk material to create reflecting surfaces that can lower the thermal conductivity. On the other hand, low residual porosity is needed to improve the contact between grains and raise the electrical conductivity. In this study, CCO fibers with 100% flat cross sections in a stacked, compact form are electrospun. Then the grains within the nanoribbons in the plane of the fibers are grown. Finally, the nanoribbons are electrospun into a textured ceramic that features simultaneously a high electrical conductivity of 177 S cm−1 and an immensely enhanced Seebeck coefficient of 200 µV K−1 at 1073 K are assembled. The power factor of 4.68 µW cm−1 K−2 at 1073 K in air surpasses all previous CCO TE performances of nanofiber ceramics by a factor of two. Given the relatively high power factor combined with low thermal conductivity, a relatively large figure-of-merit of 0.3 at 873 K in the air for the textured nanoribbon ceramic is obtained.
Keywords
- electron microscopy, electrospinning, microstructure, nanoribbons, thermoelectric properties
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Chemistry(all)
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Electrochemistry
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In: Advanced functional materials, Vol. 33, No. 49, 2304464, 01.12.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Superior Thermoelectric Performance of Textured Ca3Co4−xO9+δ Ceramic Nanoribbons
AU - Maor, Itzhak I.
AU - Kruppa, Katharina
AU - Rozencweig, Adi
AU - Sterzer, Amir
AU - Steinbach, Frank
AU - Beilin, Vadim
AU - Breidenstein, Bernd
AU - Shter, Gennady E.
AU - Mann-Lahav, Meirav
AU - Feldhoff, Armin
AU - Grader, Gideon S.
N1 - Funding Information: I.I.M. and K.K. contributed equally to this work. This work was financially supported by the Lower Saxony Ministry of Science and Culture in the frame of the Research Cooperation Lower Saxony‐Israel, project number 2029896. This work was supported by the Nancy & Stephan Grand Technion Energy Program (GTEP). G.S.G. 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. The authors would like to thank Kobi Goffer and Ilya Margulis for their help with capturing the photos of electrospinning process during its operation.
PY - 2023/12/1
Y1 - 2023/12/1
N2 - Calcium cobaltite Ca3Co4−xO9+δ (CCO) is a promising p-type thermoelectric (TE) material for high-temperature applications in air. The grains of the material exhibit strong anisotropic properties, making texturing and nanostructuring mostly favored to improve thermoelectric performance. On the one hand multitude of interfaces are needed within the bulk material to create reflecting surfaces that can lower the thermal conductivity. On the other hand, low residual porosity is needed to improve the contact between grains and raise the electrical conductivity. In this study, CCO fibers with 100% flat cross sections in a stacked, compact form are electrospun. Then the grains within the nanoribbons in the plane of the fibers are grown. Finally, the nanoribbons are electrospun into a textured ceramic that features simultaneously a high electrical conductivity of 177 S cm−1 and an immensely enhanced Seebeck coefficient of 200 µV K−1 at 1073 K are assembled. The power factor of 4.68 µW cm−1 K−2 at 1073 K in air surpasses all previous CCO TE performances of nanofiber ceramics by a factor of two. Given the relatively high power factor combined with low thermal conductivity, a relatively large figure-of-merit of 0.3 at 873 K in the air for the textured nanoribbon ceramic is obtained.
AB - Calcium cobaltite Ca3Co4−xO9+δ (CCO) is a promising p-type thermoelectric (TE) material for high-temperature applications in air. The grains of the material exhibit strong anisotropic properties, making texturing and nanostructuring mostly favored to improve thermoelectric performance. On the one hand multitude of interfaces are needed within the bulk material to create reflecting surfaces that can lower the thermal conductivity. On the other hand, low residual porosity is needed to improve the contact between grains and raise the electrical conductivity. In this study, CCO fibers with 100% flat cross sections in a stacked, compact form are electrospun. Then the grains within the nanoribbons in the plane of the fibers are grown. Finally, the nanoribbons are electrospun into a textured ceramic that features simultaneously a high electrical conductivity of 177 S cm−1 and an immensely enhanced Seebeck coefficient of 200 µV K−1 at 1073 K are assembled. The power factor of 4.68 µW cm−1 K−2 at 1073 K in air surpasses all previous CCO TE performances of nanofiber ceramics by a factor of two. Given the relatively high power factor combined with low thermal conductivity, a relatively large figure-of-merit of 0.3 at 873 K in the air for the textured nanoribbon ceramic is obtained.
KW - electron microscopy
KW - electrospinning
KW - microstructure
KW - nanoribbons
KW - thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=85165718900&partnerID=8YFLogxK
U2 - 10.1002/adfm.202304464
DO - 10.1002/adfm.202304464
M3 - Article
AN - SCOPUS:85165718900
VL - 33
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 49
M1 - 2304464
ER -