Sm-doped praseodymium nickelates-cobaltites and their nanocomposites with Y-doped ceria as promising cathode materials

ABSTRACT

This work aims at elucidating effects of composition and microstructure of materials based upon Pr_1-ySm_yNi_1-xCo_xO_3-δ perovskites on their oxygen mobility. Pr_1-ySm_yNi_1-xCo_xO_3-δ and their composites with Y-doped ceria are perspective materials for intermediate temperature solid oxide fuel cells and oxygen separation membranes. Doping PrNi_1-xCo_xO_3-δ by Sm results in suppression of the fast channel of oxygen diffusion along extended defects due to Sm segregation in their vicinity. For nanocomposites moderate doping by Sm enhances fast oxygen diffusion in fluorite phase domains and along perovskite-fluorite interface due to a higher disordering caused by incorporation of both Pr and Sm cations into Y-doped ceria.

KEYWORDS:

• SOFC; cathodes; Sm-doped nickelates-cobaltites of Pr; Y-doped ceria; nanocomposites; synthesis; real structure; cations redistribution; oxygen isotope heteroexchange; oxygen self-diffusion coefficients

Funding

Support by BIOGO FP7Project, Project V.45.3.8 of the Russian Academy of Sciences and Federal Agency of Scientific Organizations as well as Russian Ministry of Education and Science (Top 5-100 Program) is gratefully acknowledged.