Oxygen-Deficient Perovskite Sr0.7Y0.3CoO2.65−δ as a Cathode for Intermediate-Temperature Solid Oxide Fuel Cells
2011
The oxygen-deficient perovskite Sr0.7Y0.3CoO2.65−δ contains Co2O6/2 (001) planes alternating with oxygen-deficient Co1O1.15-δ planes having 0.15−δ O4 oxygen in the plane capping tetrahedral site Co1. With ordering of the O4 atoms below 300 °C, the oxide exhibits n-type polaronic conduction associated with localized high-spin 3d electronic configurations on Co2+ in Co1 sites; a transition to itinerant-hole conduction occurs on disordering of O4 ions over the range 350 < T < 600 °C. Above 600 °C, Sr0.7Y0.3CoO2.65−δ is a mixed oxide-ion/electronic conductor exhibiting good activity for the oxygen-reduction reaction, which makes it a competitive cathode material for an intermediate-temperature solid oxide fuel cell.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
25
References
58
Citations
NaN
KQI