8YSZ (8 mol% yttria-stabilized zirconia) electrolyte substrates are primarily used in electrolyte-supported SOFCs. They provide mechanical integrity to the cell structure and enable efficient oxygen ion transport between anode and cathode. Fully stabilized YSZ substrates also offer a reliable platform for electrode material development. They are well suited for short-term destructive testing applications, providing a cost-effective option for electrode research and materials screening purposes.