Application of the Ce-based radical scavengers in proton exchange membrane fuel cells.

Proton exchange membrane fuel cells (PEMFCs) have garnered considerable interest owing to their high conversion efficiency and eco-friendliness. However, the components of PEMFCs are prone to degradation caused by generated radicals, hindering their widespread application. To counteract the chemical attack of radicals on PEMFC components, the key solution is to incorporate radical scavengers, as they can effectively eliminate harmful radicals. Ce-based scavengers exhibit the highest radical scavenging capacity, whereas they are susceptible to dissolution and may exert poisoning effects on ionomers, thereby impacting proton conductivity and gas mass transfer. Additionally, Ce-based radical scavengers may degraded and migrated due to varying chemical and electrochemical conditions. This study delves into the scavenging mechanisms and influences of Ce-based radical scavengers. Furthermore, it addresses the issues of poisoning and migration and outlines appropriate measures to mitigate these challenges. This review aims to offer an innovative solution to enhance the durability of PEMFCs. [Display omitted] • Reviewed the scavenging mechanisms of Ce-based radical scavengers and their effects. • Discussed the poisoning effects of Ce-based radical scavengers and provided some mitigation strategies. • Highlighted the migration of Ce species and the corresponding stabilization strategies. • Presented the technical challenges and future development prospects of Ce-based radical scavengers. [ABSTRACT FROM AUTHOR]