CuO-NiO/CeO2-ZrO2-Sc2O3 nanomateriales with mixed ionic-electronic conductivity for SOFC applications: in-situ XANES characterization

TOSCANI, L. M.; MOGNI, L. V.; LAMAS, D. G.; SUAREZ ANZORENA, M.R.; LARRONDO, S. A.

Encuentro virtual

Congreso; 30th RAU Annual Users Meeting LNLS-CNPEM; 2020

LNLS-CNPEM

The development of anode materials for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC, 500-700°C) requires tailoring nanomaterials to enhance mixed ionicelectronic conductivity and electrocatalytic activity. The great density of surface defects plays a key role as active sites for fuel oxidation reactions in these nanomaterials. In particular, nanostructured CeO2-ZrO2 (CeZr) exhibits electronic conductivity in reducing atmospheres and a high oxygen mobility in the lattice that contribute to suppress carbon formation and/or sulfur present in the fuel. The aim of this work is to study the effect of an aliovalent dopant, Sc3+, on oxygen vacancy generation in the CeZr lattice and its impact in the kinetics of ceria reduction of CuO-NiO/CeO2-ZrO2-Sc2O3 cermets with different fuels (H2 or CH4). Samples were synthesized using the citrate complexation route (CIT) with the following compositions: Ce0,9ScxZr0,1-xOδ, with 0