Investigating the effects of degradation on the local structure of LSCF and BSCuF powdery and nanofibrous air-electrodes for solid oxides ce

La1-xSrxCo1-yFeyO3-d (LSCF) and Ba1-xSrxCo1-yFeyO3-d (BSCF) systems are the most promising mixed ionic-electronic conductors to be used as air-electrodes in Solid Oxide Fuel and Electrolysis Cells working at intermediate temperature. Due to the increasing interest of the scientific community towards Co-free electrodes, we undertook a study on the Ba1-xSrxCu1-yFeyO3-δ system (BSCuF), synthesizing samples with different stoichiometries, both in the form of micrometric powders (sol-gel process), and electrospun nanofibers, to test their performances in symmetrical button cells. To deeper understand the electrochemical behaviour of BSCuF, we will collect XAS spectra on the reference La0.6Sr0.4Co0.2Fe0.8O3–δ and on several BSCuF electrodes. Spectra will be also collected on the same electrodes after several working cycles, to evaluate the correlations between their structure and their deterioration. Moreover, in-situ measurements will be performed at the Ba, La and Sr K-edges.