Novel Perovskite Structured Nd 0.5 Ba 0.5 Co 1/3 Ni 1/3 Mn 1/3 O 3-δ as Highly Efficient Catalyst for Oxygen Electrode in Solid Oxide Electrochemical Cells.

Developing catalytic materials with highly efficient oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential for lower-temperature solid oxide fuel cell (SOFC) and electrolysis cell (SOEC) technologies. In this work, a novel triple perovskite material, Nd 0.5 Ba 0.5 Co 1/3 Ni 1/3 Mn 1/3 O 3-δ , has been developed and employed as a catalyst for both ORR and OER in SOFC and SOEC operations at relatively lower temperatures, showing a low polarization resistance of 0.327 Ω cm 2 , high-power output of SOFC up to 773 mW cm -2 at 650 °C, and a high current density of 1.57 A cm -2 from SOEC operation at 1.5 V at 600 °C. The relaxation time distribution reveals that Nd 0.5 Ba 0.5 Co 1/3 Ni 1/3 Mn 1/3 O 3-δ could maintain a slow polarization process at the relatively low operating temperature, offering a significant antipolarization advantage over other perovskite electrode materials. The Nd 0.5 Ba 0.5 Co 1/3 Ni 1/3 Mn 1/3 O 3-δ electrode provides a low energy barrier of about 0.36 eV in oxygen ion mobility, which is beneficent for oxygen reduction/evolution reaction processes.