Details
| Original language | English |
|---|---|
| Pages (from-to) | 9899-9906 |
| Number of pages | 8 |
| Journal | ACS Omega |
| Volume | 3 |
| Issue number | 8 |
| Early online date | 24 Aug 2018 |
| Publication status | Published - 31 Aug 2018 |
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.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
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In: ACS Omega, Vol. 3, No. 8, 31.08.2018, p. 9899-9906.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - All-Oxide Thermoelectric Module with in Situ Formed Non-Rectifying Complex p-p-n Junction and Transverse Thermoelectric Effect
AU - Kanas, Nikola
AU - Bittner, Michael
AU - Desissa, Temesgen Debelo
AU - Singh, Sathya Prakash
AU - Norby, Truls
AU - Feldhoff, Armin
AU - Grande, Tor
AU - Wiik, Kjell
AU - Einarsrud, Mari Ann
N1 - Funding Information: The financial support from The Research Council of Norway under the program Nano2021 to the project (number 228854) “TE materials: Nanostructuring for improving the energy efficiency of TEG and heat-pumps” (THELMA) conducted by NTNU, UiO, SINTEF, FFI, UiS, and UiA is gratefully acknowledged. We also thank for the financial support from the Deutsche Forschungsgesellschaft (DFG, German Research Foundation)-FE928/17-1. Dr Mohsin Saleemi and Dr Julian Tolchard are acknowledged for fruitful discussions.
PY - 2018/8/31
Y1 - 2018/8/31
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85052554038&partnerID=8YFLogxK
U2 - 10.1021/acsomega.8b01357
DO - 10.1021/acsomega.8b01357
M3 - Article
AN - SCOPUS:85052554038
VL - 3
SP - 9899
EP - 9906
JO - ACS Omega
JF - ACS Omega
IS - 8
ER -