Single phase oxides P1−xBCO with x = 0.00–0.10 were successfully prepared.
TECs and electrical conductivities of P1−xBCO cathodes decrease with Pr-deficiency.
Among P1−xBCO cathodes, P0.92BCO exhibits the lowest polarization resistance.
Electron charge transfer plays a dominant role in cathode oxygen reduction.
Pmax of 987 mW cm−2 at 800 °C for P0.92BCO cathode is obtained on SDC electrolyte.