Durable solid oxide electrolysis cells and stacks

It is the purpose of the present project to make a substantial contribution to development of cost competitive electrolysis technology based on solid oxide electrolysis cells. Two critical issues in this context are to improve the durability of the cells and stacks and to increase the power density. Previous research has established that this calls for improved cathodes (water electrodes) and seals that emit less Si than the presently used ones. Economical analysis has shown that it greatly improves the cost competitiveness of the technology if the stacks can be operated at current densities of more than 1.5 A/cm2, which is achievable if the stacks can be operated at temperatures higher than 800 deg. C. In this case the durability of the stack is strongly influenced by the lifetime of the interconnect material, which is consequently also addressed in the project. The research is divided into five different tasks: 1. Cell and stack testing and post-test characterization The purpose is to: 1) Test the performance of components being developed, and 2) to identify the degradation mechanisms and develop counteracting measures. 2. Development of interconnects and interconnect coatings The objective is to develop corrosion resistant interconnects and coatings to allow for stable operation at 850 deg. C. 3. Development of seals The purpose is to develop good seals which only release small amounts Si during operation. 4. Development of durable SOEC cathodes Three different routes for improving the cathode will be pursued. 5. Modelling The optimal design of an SOEC stack will be assessed by modelling