Ceramic Diffusion Barrier Layers for Metal Supported SOFCs

Abstract

Metal supported solid oxide fuel cells (MSCs) show a high poten- tial predominantly for an application as light-weight planar cells for electricity supply systems in cars and other mobile systems. One of the most promising MSC concepts is the plasma sprayed thin film concept of DLR-Stuttgart in which powder metallurgi-cally manufactured substrates, developed within a collaboration of Plansee and DLR, serves as mechanical cell support. In MSCs gen-erally problems can occur in particular by a mutual diffusion of Ni, Fe and Cr on the substrate/anode interface that causes significant cell degradation. To avoid this mass transport ceramic diffusion barrier layers consisting of Cr2O3 and/or MnCr2O4 or doped LaCrO3-type perovskites are provided. The paper focuses on a ma- terial study of different substrate materials performed with inte-grated diffusion barrier layers. Furthermore, the electrochemical long term behaviour of cells with different plasma sprayed barrier layers is shown demonstrating the barrier effect and the electro-chemical compatibility.