Seven La1-xSrxFeO3-delta (x = 0, 0.05, 0.15, 0.25, 0.35, 0.50, 0.70) based perovskites were synthesized using the glycine-nitrate method. The La1-xSrxFeO3-delta compounds were characterized with powder X-ray diffraction and electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce1.9Gd0.1O1.95 electrolyte. The activity of the La1-xSrxFeO3-delta based perovskites towards the electrochemical reduction of oxygen was strongly dependent of the strontium content, the activity being highest for the composition La0.85Sr0.15FeO3-delta. The results indicates that Fe(III) is the catalytic active specie towards the electrochemical reduction of oxygen in a solid oxide fuel cell on La1-xSrxFeO3-delta compounds. The results also show that oxide ion vacancies in the perovskite structure are important for the electrochemical reduction of oxygen. However, the effect of ordering of oxide ion vacancies for the strontium rich compounds can not be excluded.
|Publication status||Published - 2008|
|Event||213th ECS Meeting: B6 - Ionic and Mixed Conducting Ceramics 6 - Phoenix Convention Center, Phoenix, AZ, United States|
Duration: 18 May 2008 → 23 May 2008
Conference number: 213th
|Conference||213th ECS Meeting|
|Location||Phoenix Convention Center|
|Period||18/05/2008 → 23/05/2008|