Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes

Patrick Pretschuh; Andreas Egger; Roland Brunner; Edith Bucher

doi:10.1002/fuce.202300036

journal article Open Access Jul 27, 2023

Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes

Patrick Pretschuh

Andreas Egger

Roland Brunner

Edith Bucher

Fuel Cells Vol. 23 No. 6 pp. 377-386 · Wiley

View at Publisher Save 10.1002/fuce.202300036

Abstract

AbstractStrontium segregation (coupled to phase decomposition and impurity poisoning) and electrode delamination are two of the most important degradation mechanisms currently limiting the long‐term stability of solid oxide fuel cell and electrolysis cell (SOFC and SOEC) air electrodes. The present study aims to demonstrate that air electrodes made of entropy‐stabilized multi‐component oxides can mitigate these degradation mechanisms while providing excellent cell performance. A SOEC utilizing La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ (LPNSSC) as an air electrode delivers −1.56 A/cm2 at 1.2 V at 800°C. This performance exceeds that of a commercial cell with La0.6Sr0.4CoO3‐δ (LSC) air electrode, which reaches −1.43 A/cm2. In a long‐term electrolysis test, the LPNSSC cell shows stable performance during 700 h, while the LSC cell degrades continuously. Post‐mortem analyses by scanning electron microscopy‐energy dispersive X‐ray spectroscopy indicate complete delamination of the LSC electrode, while LPNSSC shows excellent adhesion. The amount of secondary phases formed (esp. SrSO4) is also much lower in LPNSSC compared to LSC. In conclusion, the high‐entropy perovskite LPNSSC is a promising option for air electrodes of solid oxide cells. While LPNSSC can compete with ‒ or even outperform ‒ LSC air electrodes in terms of electrochemical performance, it could be particularly advantageous in terms of long‐term stability in SOEC mode.

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Details

Published: Jul 27, 2023
Vol/Issue: 23(6)
Pages: 377-386
License: View

Authors

P

Patrick Pretschuh

Department General, Analytical and Physical Chemistry Montanuniversitaet Leoben, Chair of Physical Chemistry Leoben Austria

A

Andreas Egger

Department General, Analytical and Physical Chemistry Montanuniversitaet Leoben, Chair of Physical Chemistry Leoben Austria

R

Roland Brunner

Department Microelectronics Materials Center Leoben Forschung GmbH Leoben Austria

E

Edith Bucher

Department General, Analytical and Physical Chemistry Montanuniversitaet Leoben, Chair of Physical Chemistry Leoben Austria

Cite This Article

Patrick Pretschuh, Andreas Egger, Roland Brunner, et al. (2023). Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes. Fuel Cells, 23(6), 377-386. https://doi.org/10.1002/fuce.202300036

Electrochemical and microstructural characterization of the high‐entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2CoO3‐δ for solid oxide cell air electrodes

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