Evaluation of electrochemical properties of LaNi 0.6 Fe 0.4 O 3−δ - Ce 0.9 Gd 0.1 O 1.95 composite as air electrode for SOFC

R. A. Budiman, S. Hashimoto, Y. Fujimaki, T. Nakamura, K. Yashiro, K. Amezawa, T. Kawada

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The electrochemical properties of the composite electrodes of LaNi 0.6 Fe 0.4 O 3−δ -Ce 0.9 Gd 0.1 O 1.95 in various compositions were measured by electrochemical impedance spectroscopy as a function of temperature and p(O 2 ). The enhancement of area-specific conductivity, σ E , was found higher than that of the single-phase porous LaNi 0.6 Fe 0.4 O 3−δ electrode. σ E greatly depends on their volume ratio, where σ E increases with the increase of the volume fraction of Ce 0.9 Gd 0.1 O 1.95 phase up to 50%. Above 50% of the volume ratio, σ E decreases which could be due to the loss of its surface area density and connectivity between LaNi 0.6 Fe 0.4 O 3−δ particles. The enhancement degree of σ E was evaluated using the transmission line model for the porous-mixed ionic and electronic electrodes. The calculated model is close to the measured σ E , showing that the enhancement of σ E is not only because of the enhancement of ionic conducting pathways but also possibly due to the decrease of the surface reaction resistivity upon contact with the Ce 0.9 Gd 0.1 O 1.95 .

Original languageEnglish
Pages (from-to)70-76
Number of pages7
JournalSolid State Ionics
Volume332
DOIs
Publication statusPublished - 2019 Apr

Keywords

  • Area-specific conductivity
  • Composite electrode
  • Ionic-conducting pathways
  • Surface-reaction resistivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Evaluation of electrochemical properties of LaNi <sub>0.6</sub> Fe <sub>0.4</sub> O <sub>3−δ</sub> - Ce <sub>0.9</sub> Gd <sub>0.1</sub> O <sub>1.95</sub> composite as air electrode for SOFC'. Together they form a unique fingerprint.

  • Cite this