Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1284541 | Journal of Power Sources | 2012 | 4 Pages |
In this paper we demonstrate the successful incorporation of oxyanions (borate, phosphate) into Ba1−ySryCo0.8Fe0.2O3−δ (BSCF) cathode materials. For low levels of dopant, a small enhancement in the conductivity was observed; e.g. 31.6, 34.4 and 35.9 S cm−1 for Ba0.33Sr0.67Co0.8Fe0.2O3−δ, Ba0.33Sr0.67Co0.76Fe0.19B0.05O3−δ and Ba0.33Sr0.67Co0.76Fe0.19P0.05O3−δ, respectively, at 700 °C. Most significantly, oxyanion doping was shown to improve the stability of the cubic form of BSCF at intermediate temperatures (especially for P-doping), helping to prevent the transition to a hexagonal cell, and maintaining its excellent electrical properties. The work shows the potential of oxyanion doping strategies to modify the performance of SOFC cathode materials.
► BaySr1−yCo0.8Fe0.2O3−δ samples have been successfully doped with borate and phosphate. ► For the B,P-doped samples there is a small enhancement in the electronic conductivity. ► Doping stabilizes the cubic form of BSCF at intermediate temperatures for long term experiments. ► The electrical properties for the P-doped samples remain unaltered after the annealing studies.