The surface oxygen exchange coefficient (k∗) of LaNi0.6Fe0.4O3-λ (LNF) coatedwith porous Ce0.9Gd0.1O1.95 (GDC) was determined by the isotope exchange technique. The LNF coated with GDC was subjected to isotope exchange treatment where 16O2 was abruptly changed into 18O2 at a range temperature of 8731073 K under 10-1 and 10-2 bar of the oxygen partial pressure (p(O2)). The line-scanning mode of secondary ion mass spectrometry was used to determine the surface oxygen exchange of the LNF coated with GDC. The k∗ of LNF coated with GDC is enhanced compared to that of the bare LNF due to the formation of triple phase boundary between LNF, GDC, and gas phase of oxygen. The role of GDC is enhancing the incorporation process of the oxygen dissociated at the LNF surface. The adsorption and dissociation of oxygen takes place at LNF surface and incorporated into GDC porous.
- Isotope exchange
- Secondary ion mass spectrometry
- Surface oxygen exchange kinetics
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics