Cobalt-free high-entropy perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2FeO3-δ solid oxide cell air electrode with enhanced performance

Patrick Pretschuh, Andreas Egger, Priya Paulachan, Johanna Schöggl, Roland Brunner, Edith Bucher

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This study investigates the novel cobalt-free high-entropy perovskite, La 0.2Pr 0.2Nd 0.2Sm 0.2Sr 0.2FeO 3–δ (LPNSSF), as an air electrode material for solid oxide cells (SOCs). When testing a button cell with a single-phase LPNSSF electrode, a current density of 0.55 A cm −2 is obtained at 0.7 V in fuel cell mode at 800°C. In order to mitigate the moderate electronic conductivity of LPNSSF, two approaches are explored. Incorporating a Co-free highly conductive perovskite, LaNi 0.6Fe 0.4O 3–δ (LNF), either as an LPNSSF–LNF composite electrode or as a current collector layer (CCL), enhances the performance to 0.61 and 0.66 A cm −2, respectively, under the same conditions. Microstructural features are studied by electron microscopy and show a rather dense structure of the CCL. Optimization of the current collector increases the current density further to 0.96 A cm −2 at 0.7 V in a 5 × 5 cm 2 anode-supported cell at 800°C. This cell exhibits good long-term stability in electrolysis mode in H 2-H 2O with 80% humidification. Continuous polarization of −0.69 A cm −2 is sustained for 1000 h, with an average degradation rate of 10 mV kh −1 after an initial run-in phase. These findings demonstrate the promising performance and durability of LPNSSF as cobalt-free SOC air electrode.


Original languageEnglish
Article numbere202400068
Number of pages11
JournalFuel Cells
Volume24.2024
Issue number3
DOIs
Publication statusPublished - 26 Jun 2024

Bibliographical note

Publisher Copyright: © 2024 The Author(s). Fuel Cells published by Wiley-VCH GmbH.

Keywords

  • cobalt-free air electrode
  • current collector layer
  • electrochemical impedance spectroscopy
  • high-entropy perovskite
  • long-term stability
  • solid oxide electrolyzer cell
  • solid oxide fuel cell

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