High-entropy materials for solid oxide cells

• High-entropy materials (HEMs) leverage four core effects—high mixed entropy stabilization, sluggish diffusion, lattice distortion, and 'cocktail' effect—to enhance catalytic activity, conductivity, and structural stability in solid oxide cells (SOCs). • HEMs are applied across all three fundamental SOC components—electrodes, electrolytes, and interconnects—offering solutions to long-term stability, high-temperature material costs, and low-temperature catalytic limitations. • In interconnects, HEMs mitigate chromium poisoning from stainless steel, a major cause of performance degradation in SOC stacks. • The review proposes future research directions for HEMs in SOCs, emphasizing high-entropy design as a promising pathway to improve overall cell performance and durability.