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

L. M. TOSCANI; ROSARIO SUAREZ ANZORENA; D.G. LAMAS; L. MOGNI; S.A. LARRONDO.

Encuentro; 30th. RAU Annual Users Meeting LNLS; 2020

The development of anode materials for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC, 500-700°C) requires tailoring nanomaterials to enhance mixed ionic-electronic conductivity and electrocatalytic activity. The great density of surface defects play 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