Sol-gel route and characterization of supported perovskites for membrane application

In the last decades the sol-gel method has registered an intensive development in new fields of applications as membrane technologies, solid-state chemical sensors, SOFCs, etc. The aim of the present work is to make a bibliographic overview on the problem discussed and to develop supported perovskites for membranes application via sol-gel route and to study them. In this context a preparation procedure has been accomplished for deposition of mixed conducting La0.8Sr0.2Co0.8Fe0.2O3-delta thin layers on porous ceramic supports. Characterization techniques, as ESR control of Fe(III) ions into the precursor solutions, SEM surface morphology study, La-Sr-Co- and Fe-element distribution, as well as XPS partial spectra of La3d-Sr3d-Co2p-Fe2p and O1s- for a single coating surface have been applied. Adequate interpretation and conclusions regarding membranes investigated are presented as well.