Climate changes is a looming shadow, getting every year closer, and institutions are finally starting to get the picture of the terrible consequences we are about to face. Investments into green energy solutions have never been that massive. European Union is towing the wagon of research, development and innovation in this field. Many projects are carried out in order to achieve a more sustainable society before it’s too late. One of them is E-TANDEM, where the goal is to perform a co-electrolysis of CO2 and steam to produce sustainable fuels. This work aims to study the first part of this production chain, in particular the Solid Oxide Electrolyser Cells (SOEC) responsible for the co-electrolysis of steam and CO2 into a hydrogen and CO syngas.