Abstract
? 2022 Elsevier B.V.(La0.8Sr0.2)0.98MnO3-δ (LSM)- Zr0.92Y0.16O2-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:PrOx composite is developed as an active electrocatalyst for both oxygen reduction and evolution reactions. A single step PrOx infiltration into LSM-YSZ lowers the polarization resistance (Rp) 10–20 times depending on the test temperature. Distribution of relaxation times (DRT) calculation reveals that adding PrOx 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:PrOx 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:PrOx supported cells with the oxide fuel electrode Sr0.95(Ti0.3Fe0.63Ni0.07)O3-δ (STFN).
NSTL
Elsevier