The effect of loading and particle size on the oxygen reaction in CGO impregnated Pt electrodes

Anders Lund, Karin Vels Hansen, Torben Jacobsen, Mogens Bjerg Mogensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Porous platinum electrodes impregnated with Gd x Ce1−x O2−δ (CGO) are investigated to characterise how nano-sized CGO grains affect the oxygen reaction. Impedance measurements were performed at temperatures between 450 and 750 °C and at oxygen partial pressures of 0.2 and 5 × 10−5 bar for electrodes with various CGO loadings and electrodes annealed at various temperatures. The morphology was characterised by scanning electron microscopy and the CGO grain size was determined from X-ray diffraction peak broadening. The results showed that the polarisation resistance decreased with increasing CGO loading and increasing annealing temperature. CGO facilitates transport of oxygen ions thereby increasing the effective triple-phase boundary.
Original languageEnglish
JournalJournal of Solid State Electrochemistry
Volume16
Issue number3
Pages (from-to)1161-1168
ISSN1432-8488
DOIs
Publication statusPublished - 2012

Keywords

  • Impregnation
  • Electrode
  • Impedance
  • Oxygen
  • Platinum

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