Impact of particle size ratio and volume fraction on effective material parameters and performance in solid oxide fuel cell electrodes

► Particle size and volume fraction in SOFC electrodes strongly influence performance. ► Binary mixtures of spherical electron and ion conducting particles in SOFC analyzed. ► We propose a new estimate for the three-phase boundary reaction domain. ► Parameter study of morphology for enhancement of electrode performance. ► Unlike sized particles in cathode increase SOFC performance up to 15%.