TY - JOUR

T1 - Transported Entropy of Ions and Peltier Coefficients in 8YSZ and 10Sc1CeSZ Electrolytes for Solid Oxide Cells

AU - Gedik, Aydan

AU - Kabelac, Stephan

N1 - Publisher Copyright: © 2024 by the authors.

PY - 2024/10/17

Y1 - 2024/10/17

N2 - In this study, the transported entropy of ions for 8YSZ and 10Sc1CeSZ electrolytes was experimentally determined to enable precise modeling of heat transport in solid oxide cells (SOCs). The Peltier coefficient, crucial for thermal management, was directly calculated, highlighting reversible heat transport effects in the cell. While data for 8YSZ are available in the literature, providing a basis for comparison, the results for 10Sc1CeSZ show slightly smaller Seebeck coefficients but higher transported ion entropies. Specifically, at (Formula presented.) and an oxygen partial pressure of (Formula presented.) bar, values of (Formula presented.) J/K·F for 10Sc1CeSZ and (Formula presented.) J/K·F for 8YSZ were obtained. The transported entropy was also validated through theoretical calculations and showed minimal deviations when comparing different cell operation modes (O2||O2−||O2 and H2, H2O||O2−||O2). The influence of the transported entropy of the ions on the total heat generation and the partial heat generation at the electrodes is shown. The temperature has the greatest influence on heat generation, whereby the ion entropy also plays a role. Finally, the Peltier coefficients of 8YSZ for all homogeneous phases agree with the literature values.

AB - In this study, the transported entropy of ions for 8YSZ and 10Sc1CeSZ electrolytes was experimentally determined to enable precise modeling of heat transport in solid oxide cells (SOCs). The Peltier coefficient, crucial for thermal management, was directly calculated, highlighting reversible heat transport effects in the cell. While data for 8YSZ are available in the literature, providing a basis for comparison, the results for 10Sc1CeSZ show slightly smaller Seebeck coefficients but higher transported ion entropies. Specifically, at (Formula presented.) and an oxygen partial pressure of (Formula presented.) bar, values of (Formula presented.) J/K·F for 10Sc1CeSZ and (Formula presented.) J/K·F for 8YSZ were obtained. The transported entropy was also validated through theoretical calculations and showed minimal deviations when comparing different cell operation modes (O2||O2−||O2 and H2, H2O||O2−||O2). The influence of the transported entropy of the ions on the total heat generation and the partial heat generation at the electrodes is shown. The temperature has the greatest influence on heat generation, whereby the ion entropy also plays a role. Finally, the Peltier coefficients of 8YSZ for all homogeneous phases agree with the literature values.

KW - electrodes heat generation

KW - non-equilibrium thermodynamics (NET)

KW - Peltier coefficient

KW - reversible heat effects

KW - Seebeck coefficient

KW - solid oxide cell (SOC)

KW - transported entropy of ions

UR - http://www.scopus.com/inward/record.url?scp=85207683416&partnerID=8YFLogxK

U2 - 10.3390/e26100872

DO - 10.3390/e26100872

M3 - Article

AN - SCOPUS:85207683416

VL - 26

JO - Entropy

JF - Entropy

SN - 1099-4300

IS - 10

M1 - 872

ER -