Abstract: State-of-the-art SOFC cathode materials based upon Sr-doped perovskites (LSFN, LSM etc.) deteriorate in the intermediate temperature (IT) range due to carbonation, while Sr-free PrNi1 xCoxO3 δ provides a stable performance. In this work nanocrystalline PrNi1-xCoxO3-δ (PNC, x = 0 ÷ 0.6) and Ce0.9Y0.1O2-δ (YDC) oxides were synthesized by Pechini route, and PNC – YDC nanocomposites were prepared via ultrasonic dispersion. All samples were characterized by XRD and TEM, their oxygen mobility and reactivity –by O2 TPD and oxygen isotope heteroexchange including CO2 SSITKA. Disordering of PNC and YDC domains in nanocomposites due to Pr redistribution provides very fast diffusion of up to 80% of bulk oxygen with Dfast ~ 10-6 cm2∙s 1 at 700 °C exceeding by 2-3 orders of magnitude that for LSCF – GDC nanocomposite. Anode-supported SOFCs with PNC – YDC nanocomposite cathodes demonstrated power density ~ 420 mW/cm2 at 700 °C which exceeds that for traditional cathode materials.

Cite: Sadykov V.A. , Eremeev N.F. , Fedorova Y.E. , Amanbaeva D.G. , Lukashevich A.I. , Krieger T.A. , Muzykantov V.S. , Pelipenko V.V. , Sadovskaya E.M. , Bobin A.S. , Ishchenko A.V.
Praseodymium Nickelate-Cobaltite Based Functionally Graded Cathodes for Intermediate Temperature Solid Oxide Fuel Cells
EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources” 30 Aug - 4 Sep 2015