All-Oxide Thermoelectric Module with in Situ Formed Non-Rectifying Complex p–p–n Junction and Transverse Thermoelectric Effect

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Kanas, N. et al.: All-Oxide Thermoelectric Module with in Situ Formed Non-Rectifying Complex p–p–n Junction and Transverse Thermoelectric Effect. In: ACS Omega 3 (2018), S. 9899-9906. DOI: https://doi.org/10.1021/acsomega.8b01357

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To cite the version in the repository, please use this identifier: https://doi.org/10.15488/4121

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Sum total of downloads: 158




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Abstract: 
All-oxide thermoelectric modules for energy harvesting are attractive because of high-temperature stability, low cost, and the potential to use nonscarce and nontoxic elements. Thermoelectric modules are mostly fabricated in the conventional π-design, associated with the challenge of unstable metallic interconnects at high temperature. Here, we report on a novel approach for fabrication of a thermoelectric module with an in situ formed p–p–n junction made of state-of-the-art oxides Ca3Co4–xO9+δ (p-type) and CaMnO3–CaMn2O4 composite (n-type). The module was fabricated by spark plasma co-sintering of p- and n-type powders partly separated by insulating LaAlO3. Where the n- and p-type materials originally were in contact, a layer of p-type Ca3CoMnO6 was formed in situ. The hence formed p–p–n junction exhibited Ohmic behavior and a transverse thermoelectric effect, boosting the open-circuit voltage of the module. The performance of the module was characterized at 700–900 °C, with the highest power output of 5.7 mW (around 23 mW/cm2) at 900 °C and a temperature difference of 160 K. The thermoelectric properties of the p- and n-type materials were measured in the temperature range 100–900 °C, where the highest zT of 0.39 and 0.05 were obtained at 700 and 800 °C, respectively, for Ca3Co4–xO9+δ and the CaMnO3–CaMn2O4 composite.
License of this version: ACS AuthorChoice License
Document Type: article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 97 61.39%
2 image of flag of Norway Norway 21 13.29%
3 image of flag of United States United States 9 5.70%
4 image of flag of India India 7 4.43%
5 image of flag of Brazil Brazil 5 3.16%
6 image of flag of Thailand Thailand 4 2.53%
7 image of flag of China China 3 1.90%
8 image of flag of Russian Federation Russian Federation 2 1.27%
9 image of flag of Korea, Republic of Korea, Republic of 2 1.27%
10 image of flag of Italy Italy 1 0.63%
    other countries 7 4.43%

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