Infiltration of ionic-, electronic- and mixed-conducting nano particles into La0.75Sr0.25MnO3–Y0.16Zr0.84O2 cathodes – A comparative study of performance enhancement and stability at different temperatures

Wolff-Ragnar Kiebach, Christina Knöfel, Francesco Bozza, Trine Klemensø, Christodoulos Chatzichristodoulou

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The microstructure and electrochemical performance of LSM–YSZ composite electrodes infiltrated with La0.8Sr0.2MnO3−δ (LSM) as an electronic conductor, LaCo0.6Ni0.4O3−δ (LCN) as a mixed conductor and Ce0.8Gd0.2O2−δ (CGO) as an ionic conductor, were compared in the temperature range 550–800 °C. All three infiltrates resulted in improved electrochemical performance. Impedance analysis suggested dissociative adsorption and transfer of species to the triple phase boundary as the main mechanism responsible for the performance enhancement in all cases, attributed to the increase in surface area and triple phase boundary upon infiltration. LCN showed the most pronounced improvement at 550 °C, but its performance degraded drastically with increasing temperature. LSM and CGO infiltrated electrodes degraded less upon heating up to 800 °C. Infiltrated CGO electrodes showed the smallest degradation rate upon long term testing at 750 °C.
Original languageEnglish
JournalJournal of Power Sources
Volume228
Pages (from-to)170-177
ISSN0378-7753
DOIs
Publication statusPublished - 2013

Keywords

  • Solid oxide fuel cell
  • LSM cathode
  • Infiltration
  • Impregnation
  • Nano particle

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