Optimization of SOFC Anode Microstructure for Performance and Highly Scalable Cells Through Graded Porosity

Abstract

Anode porosity is fundamental to the performance and durability of SOFCs. This research evaluated the role of pore former loading in the anode layer to optimize the trade-off between cell performance and flatness. It was found that intermediate levels of organic loading through pore former resulted in the highest performance while also the greatest degree of curvature. Grading the porosity such that it decreases towards the electrolyte improved the performance at lower temperatures and fuel ratios. Graded anodes only improved flatness when larger loadings of pore former were used, but this resulted in a loss of performance. When considering both flatness and curvature, graded anodes resulted in cells that were flat and had decent but not the highest performance. Based on our results, the anode microstructure closest to the electrolyte strongly affects performance, while the microstructure towards the fuel affects flatness.