Research progress Research Progress on the Stability of Pt-based Catalysts in Oxygen Reduction Reactions

• 1、Chemistry and Chemical Engineering School,Chongqing University,401331

Abstract：Proton exchange membrane fuel cells (PEMFCs) are regarded as highly promising energy conversion devices due to their high power density and zero-emission characteristics. The cathodic oxygen reduction reaction (ORR) is the critical rate-limiting process determining the long-term stability and performance of PEMFCs. Although Pt-based catalysts remain the benchmark electrocatalysts for ORR, Pt nanoparticles are susceptible to degradation-including dissolution, agglomeration, and support corrosion-under frequent start-stop or transient operating conditions, resulting in a progressive loss of electrochemical surface area that severely restricts the long-term stable operation of PEMFCs. Therefore, a comprehensive understanding of the research progress in stability enhancement for Pt-based catalysts is essential to drive the development of high-durability materials. Focusing on two technical dimensions-the intrinsic stability of Pt nanoparticles and the stability of catalyst supports-this paper systematically reviews recent strategic advances and their underlying stability-reinforcing mechanisms. Finally, future design strategies for high-durability Pt-based catalysts are proposed to provide a reference for accelerating the commercialization of PEMFCs.

Keywords： PEMFCs ORR Pt-based catalysts durability