(La0.8Sr0.2)0.98MnO3-δ-Zr0.92Y0.16O2-δ:PrOx for oxygen electrode supported solid oxide cells

(La 0.8 Sr 0.2 ) 0.98 MnO 3-δ (LSM)- Zr 0.92 Y 0.16 O 2-δ (YSZ) has been widely studied as the cathode for solid oxide fuel cells (SOFCs), but its low activity has been a cell performance limiting factor. Herein, LSM-YSZ:PrO x composite is developed as an active electrocatalyst for both oxygen reduction and evolution reactions. A single step PrO x infiltration into LSM-YSZ lowers the polarization resistance (R p ) 10–20 times depending on the test temperature. Distribution of relaxation times (DRT) calculation reveals that adding PrO x affects surface exchange between adsorbed/desorbed oxygen and lattice oxygen, and oxygen dissociative adsorption/desorption. A symmetrical cell with a thin YSZ electrolyte sandwiched between thick LSM-YSZ:PrO x electrode-supports is developed and its oxygen generation performance and stability are evaluated under various current densities and temperatures. Reversible solid oxide cell (ReSOC) performance is also reported for LSM-YSZ:PrO x supported cells with the oxide fuel electrode Sr 0.95 (Ti 0.3 Fe 0.63 Ni 0.07 )O 3-δ (STFN). • LSM-YSZ:PrOx is an highly active electrocatalyst for oxygen reduction and evolution reactions. • LSM-YSZ:PrO x ∣YSZ∣LSM-YSZ:PrO x cell shows excellent oxygen generating performance. • LSM-YSZ:PrO x ,O 2 ∣YSZ∣Sr 0.95 (Ti 0.3 Fe 0.63 Ni 0.07 )O 3-δ cell is amongst the best reported oxygen-electrode supported cells.