Investigation of the necessity to apply a (Ce, Gd)O2 interlayer between the low-temperature processed (La, Sr)CoO3 electrode film and the (Zr, Y)O2 electrolyte in solid oxide fuel cells

Erdöl S., Demirkal E., Öcal M. T., Ahsen A. Ş., Ozkoç M. S., Ow-Yang C., ...More

Solid State Ionics, vol.386, 2022 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 386
  • Publication Date: 2022
  • Doi Number: 10.1016/j.ssi.2022.116030
  • Journal Name: Solid State Ionics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Lanthanum strontium cobalt oxide, Cerium gadolinium oxide interlayer, Phase evolution, Solid oxide fuel cell cathodes, OXYGEN REDUCTION REACTION, PEROVSKITE THIN-FILMS, ELECTROCHEMICAL PERFORMANCE, THERMODYNAMIC ANALYSIS, BUFFER LAYER, SURFACE, CATHODES, KINETICS, MECHANISM, EXCHANGE
  • Kocaeli University Affiliated: No

Abstract

© 2022 Elsevier B.V.Gadolinia doped ceria (GDC) interlayers have been widely used to avoid resistive phase formation at the mixed ionic electronic conductor (MIEC) (La,Sr)CoO3 (LSC) air electrode/ yttria stabilized zirconia (YSZ) electrolyte interfaces. Although MIEC electrodes fabricated by low-temperature metal organic precursor methods offer the highest electrochemical performance, no studies exist on the effect of GDC interlayer on their performance. In this work, we investigated the necessity for a GDC interlayer between the low-temperature processed LSC electrode and the YSZ electrolyte. Through x-ray diffraction, scanning transmission electron microscopy/energy-dispersive x-ray spectroscopy and x-ray photoelectron spectroscopy analyses, we studied the impact of the GDC interlayer on i) the formation of resistive zirconate phases at the LSC/YSZ interface and ii) the overall phase and surface chemistry evolution. While no resistive zirconate phases formed in the LSC/YSZ system due to low processing temperatures, La leaching into the GDC layer altered the overall phase evolution, in addition to the resulting cation stoichiometry. This LSC/GDC/YSZ system showed a polarization resistance improved by an order of magnitude, attributable to the changes in phase composition.