Abstract
Here, we present the performance of a thermoelectric (TE) module consisting of n-type (La0.12Sr0.88)0.95TiO3 and p-type Ca3Co4−xO9+δ materials. The main challenge in this investigation was operating the TE module in different atmospheric conditions, since n-type has optimum TE performance at reducing conditions, while p-type has optimum at oxidizing conditions. The TE module was exposed to two different atmospheres and demonstrated higher stability in N2 atmosphere than in air. The maximum electrical power output decreased after 40 h when the hot side was exposed to N2 at 600°C, while only 1 h at 400°C in ambient air was enough to oxidize (La0.12Sr0.88)0.95TiO3 followed by a reduced electrical power output. The module generated maximum electrical power of 0.9 mW (∼ 4.7 mW/cm2) at 600°C hot side and δT ∼ 570 K in N2, and 0.15 mW (∼ 0.8 mW/cm2) at 400°C hot side and δT ∼ 370 K in air. A stability limit of Ca3Co3.93O9+δ at ∼ 700°C in N2 was determined by in situ high-temperature x-ray diffraction.
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Acknowledgments
Open Access funding provided by NTNU Norwegian University of Science and Technology incl St. Olavs Hospital - Trondheim University Hospital. We gratefully acknowledge financial support from the Research Council of Norway under the program Nano2021 to the project (number 228854) “Thermoelectric materials: Nanostructuring for improving the energy efficiency of thermoelectric generators and heat-pumps” (THELMA) conducted by NTNU, UiO, SINTEF, FFI, UiS and UiA. Dr. Magnus Rotan (NTNU) is acknowledged for technical support on HT-XRD. We also thank the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—FE928/17-1 for the financial support.
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Kanas, N., Skomedal, G., Desissa, T.D. et al. Performance of a Thermoelectric Module Based on n-Type (La0.12Sr0.88)0.95TiO3−δ and p-Type Ca3Co4−xO9+δ. J. Electron. Mater. 49, 4154–4159 (2020). https://doi.org/10.1007/s11664-020-08127-5
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DOI: https://doi.org/10.1007/s11664-020-08127-5