GdBaCo2O5 + x cathode for anode-supported ceria SOFCs

The single-phase GdBaCo2O5 + x (GBCO) and GBCO–Gd0.2Ce0.8O1.9 (GDC) composites (10, 30 wt.%) were tested as a cathode material on the anode-supported SOFCs. The cathodes were screen printed on ∼ 20 μm-thick GDC electrolyte that was supported on ∼ 1 mm-thick Ni–GDC anode. The maximum power density (Pmax) of 0.56 W cm− 2 was obtained for the cells with single-phase GBCO cathode at 600 °C under air / 97% H2 + 3% H2O gradient. Pmax decreased to 0.44 and 0.20 W cm− 2 when 10 wt.% and 30 wt.%, respectively, of GDCs were added into GBCO cathodes.