Publication date: 10th April 2024
A double perovskite oxide is known to increase oxygen reduction reaction and oxygen evolution reaction due to its high oxygen surface exchange coefficient and oxygen ion diffusion coefficient. Therefore much effort has given into use of double perovskite oxides for an air electrode in solid oxide cells. In this study, nanoparticles of a double perovskite oxide of Nd(Ba,Ca)Co2O5+δ (NBCC) was formed on the surface of (La,Sr)(Co,Fe)O3-δ (LSCF) air electrode, and then the microstructure, electrochemical properties and performance were evaluated. Double perovskite nanoparticles formed using an ultrasonic spray infiltration method exhibited a single phase and a heterostructure of epitaxial growth along with LSCF lattice. The NBCC@LSCF heterostructured air electrode indicated an enhanced oxygen reduction reaction led by promotion of surface oxygen exchange and diffusion. A cell using the heterostructure air electrode revealed a maximum power density of 1.4 W/cm2 at 700°C even higher than that of a commercial LSCF electrode. The cell also showed an excellent long-term stability under reversible operation between fuel cell and electrolysis modes.
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2022M3J1A108539011).
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