LaCoO3: Promising cathode material for protonic ceramic fuel cells based on a BaCe0.2Zr0.7Y0.1O3−δ electrolyte

Sandrine Ricote, Nikolaos Bonanos, Filip Lenrick, Reine Wallenberg

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Symmetric cells (cathode/electrolyte/cathode) were prepared using BaCe0.2Zr0.7Y0.1O3−δ (BCZY27) as proton conducting electrolyte and LaCoO3 (LC) infiltrated into a porous BCZY27 backbone as cathode. Single phased LC was formed after annealing in air at 600 °C for 2 h. Scanning electron micrographs showed the presence of the infiltrated LC in the full cathode depth. Transmission electron micrographs revealed LC grains (60–80 nm) covering partly the BCZY27 grains (200 nm–1 μm). Impedance spectra were recorded at 500 °C and 600 °C, varying the oxygen partial pressure and the water vapour pressure. Two arcs correspond to the cathode contribution: a middle range frequency one (charge transfer) and a low frequency one (oxygen dissociation/adsorption). The area specific resistances (ASRs) of both contributions increase when decreasing the oxygen partial pressure. The low frequency arc is independent on the water vapour pressure while the charge transfer ASR values increase with higher pH2O. The cathode ASRs of 0.39 and 0.11 Ω cm2 at 500 and 600 °C respectively, in air (pH2O = 0.01 atm) are the lowest reported to the authors’ knowledge for PCFC cathodes. Furthermore, this work shows that the presence of oxide ion conduction in the cathode material is not necessary for good performance.
Original languageEnglish
JournalJournal of Power Sources
Volume218
Pages (from-to)313-319
ISSN0378-7753
DOIs
Publication statusPublished - 2012

Keywords

  • PCFC
  • BCZY
  • Lanthanum cobaltite
  • Cathode material
  • Infiltration

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