Investigating the Oxygen Storage Capacity and the Ce valence state of pure and Gd doped Cerium oxides functional materials under reducing co

The aim of the experiment is to perform a of X-ray Raman Scattering (XRS) spectroscopy investigation at the Ce-N4-N5 edge on Ce1-xGdxO2-d solid solutions (x=0, 0.25, 0.50, 0.75), to contribute to the comprehension of the oxygen vacancy concentration and of the valence state of cerium in pure and Gd doped Ceria functional materials under reducing conditions, i.e. in operating conditions when adopted as a solid electrolyte in solid oxide fuel cells. Samples will be measured in an in-situ cell, available at ESRF from the sample environment laboratory (microtomo) upon reducing (He/CO 5%) and oxidizing reaction (He/O2 20%) at different temperature raging from RT to 973 K This will allow gaining direct observation of the impact of the Gd dopant in the ceria and in its Oxygen Storage Capacity and on the bulk concentration of Ce3+.