Report on PVD barrier layer development (D2.2)
This deliverable D2.2 reports the development of the PVD process for inter-diffusion barrier layer deposition.
The barrier layer in the solid oxide electrolyser cell is required between the electrolyte (Yttria-stabilized Zirconia) and the oxygen electrode (Lanthanum Strontium Cobalt oxide) to prevent chemical reactions inter-diffusion between the two layers. The reaction between the layers creates a high resistance layer thus reduces the performance of the cell.
The most commonly used barrier layers are made of Gadolinium doped Cerium (GDC). The barrier layer not only needs to block strontium from migrating towards the electrolyte layer, but it also needs to have low electrical resistance and a thermal expansion coefficient close to the two surrounding layers.