Pr0.6Sr0.4CoO3−δ electrocatalyst for solid oxide fuel cell cathode introduced via infiltration

► High electrocatalytic activity of Sr-doped PrCoO3 for oxygen reduction reaction has been demonstrated. ► 35-38% of power density enhancement has been achieved for a commercial cell by introducing Sr-doped PrCoO3 via infiltration. ► Fuel cells modified with nano-sized electrocatalyst have shown relatively stable performance for 200 h. ► Reliable performance comparison has been realized by utilizing a parallel cell testing system.