Evolution of elemental distribution in single liquid precursor-derived nanocomposite solid oxide cell electrodes at nanoscale and its impact on electrochemical performance stability

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Goral, Levent and Sezen, Meltem and Ow-Yang, Cleva W. and Günhan, Büşra and Buyukaksoy, Aligul (2023) Evolution of elemental distribution in single liquid precursor-derived nanocomposite solid oxide cell electrodes at nanoscale and its impact on electrochemical performance stability. Journal of Solid State Electrochemistry, 27 (3). pp. 655-666. ISSN 1432-8488 (Print) 1433-0768 (Online)

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Abstract

A powder-free solid oxide cell electrode fabrication route is demonstrated, in which a polymeric precursor, containing the cations of electrocatalyst and ionic conductor phases, is deposited onto a dense electrolyte. By this approach, the formation of a La0.8Sr0.2FeO3-Ce0.8Sm0.2O2 (LSF-SDC) nanocomposite structure because of nanoscale phase separation was ensured upon drying by low-temperature heat treatment. The long-term stability of their electrochemical performance was tracked and correlated with the evolution of the elemental distribution at the nanoscale via electrochemical impedance spectroscopy and detailed electron microscopy/x-ray spectroscopy, respectively. The nanocomposite structure yielded electrode polarization resistances as low as 0.34 Ω.cm2 at 650 °C. Long-term performance stability is shown to be determined by the pre-heat treatment step. Samples heat-treated at 800 °C underwent continuous performance degradation, driven by the de-mixing of a Sr-rich phase. By contrast, LSF-SDC electrodes that were not heat-treated did not undergo such a phase separation and exhibited stable electrochemical performance.
Item Type: Article
Uncontrolled Keywords: Long-term stability; Nanocomposite electrode; Polymeric precursors; SOFC
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Cleva W. Ow-Yang
Date Deposited: 12 Apr 2023 11:02
Last Modified: 12 Apr 2023 11:02
URI: https://research.sabanciuniv.edu/id/eprint/45333

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