Solid oxide fuel cells (SOFCs) are excellent energy converters with significant potential for mitigating anthropogenic carbon dioxide emissions. Nonetheless, challenges such as electrochemical degradation and mechanically induced cracking highlight the need for a deeper understanding of the individual fuel cell layers within SOFC architectures and their mutual interactions [1]. In the present research, a multiscale and multiphysics modeling framework is developed to investigate the effect of the porous electrodes on the overall macroscopic performance of SOFCs. In a first step, the electrode microstructure is characterized by using suitable morphological descriptors; the corresponding effective transport and mechanical properties are determined by first-order homogenization techniques [2]. These homogenized properties are subsequently integrated into a comprehensive macroscopic multifield model that simultaneously accounts for electrical, chemical, thermal, and mechanical phenomena. This enables the evaluation of key performance metrics, such as the electrical power density of a single fuel cell. Given the elevated operating temperatures of SOFCs, time-dependent deformation effects are additionally incorporated by considering effective creep behavior [3]. Overall, the presented work provides a coupled multifield approach on the macroscale. In addition, an advanced structure–property–performance simulation framework is established that provides a robust foundation for the targeted optimization of the microstructure of individual fuel cell layers. The result of the novel optimization process chain is an anode that maximizes the electrochemical power density based on experimentally measured microstructures. [1] Z. Wu, P. Zhu, Y. Huang, J. Yao, F. Yang, Z. Zhang, M. Ni. A comprehensive review of modeling of solid oxide fuel cells: from large systems to fine electrodes. Chemical reviews, 125(4), 2184-2268 (2025). [2] E. Langner, P. Seibert, A. Semenov, M. Kästner, and T. Wallmersperger. Structure– Property Relationships of Solid Oxide Fuel Cell Electrodes Using Real and Reconstructed Microstructures. International Journal for Numerical Methods in Engineering 126, no. 24 (2025): e70205. [3] A. Semenov, E. Langner, M. El Hachemi, S. Belouettar, T. Wallmersperger. Modelling and simulation of the electro-chemo-thermo-mechanical behaviour of solid oxide fuel cells considering creep. Acta Mechanica (2025).