Journal article
Time-enhanced performance of oxide thermoelectric modules based on a hybrid p-n junction
Technical University of Denmark1
Continuum Modelling and Testing, Department of Energy Conversion and Storage, Technical University of Denmark2
Department of Energy Conversion and Storage, Technical University of Denmark3
Norwegian University of Science and Technology4
University of Oslo5
Functional Oxides, Department of Energy Conversion and Storage, Technical University of Denmark6
The present challenge with all-oxide thermoelectric modules is their poor durability at high temperatures caused by the instability of the metal-oxide interfaces at the hot side. This work explains a new module concept based on a hybrid p-n junction, fabricated in one step by spark plasma co-sintering of Ca3Co4-xO9+δ (CCO, p-type) and CaMnO3-δ/CaMn2O4 (CMO, n-type).
Different module (unicouple) designs were studied to obtain a thorough understanding of the role of the in situ formed hybrid p-n junction of Ca3CoMnO6 (CCMO, p-type) and Co-oxide rich phases (p-type) at the p-n junction (>700 °C) in the module performance. A time-enhanced performance of the modules attributed to this p-n junction formation was observed due to the unique electrical properties of the hybrid p-n junction being sufficiently conductive at high temperatures (>700 °C) and nonconductive at moderate and low temperatures.
The alteration of module design resulted in a variation of the power density from 12.4 (3.1) to 28.9 mW/cm2 (7.2 mW) at ΔT ∼ 650 °C after 2 days of isothermal hold (900 °C hot side). This new concept provides a facile method for the fabrication of easily processable, cheap, and high-performance high-temperature modules.
Language: | English |
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Publisher: | American Chemical Society |
Year: | 2021 |
Pages: | 197-205 |
ISSN: | 24701343 |
Types: | Journal article |
DOI: | 10.1021/acsomega.0c04134 |
ORCIDs: | Bjørk, Rasmus and Pryds, Nini |