SO2　is　one　of　the　critical　poisoning　species　to　Pt　based　catalysts　of　proton　exchange　membrane　fuel　cells　(PEMFCs).　Catalysts　suffer　severe　performance　degradation　even　trace　amount　of　SO2　presenting　in　the　hydrogen　or　air.　To　enhance　the　SO2　electrooxidation　of　Pt　catalyst,　we　prepared　Pt/CeO2/C　composite　catalysts　via　a　one-pot　synthesis　method.　The　CeO2　nanoparticles　initially　deposited　on　carbon　black,　and　followed　by　Pt　nanoparticles　selectively　nucleating　on　CeO2　surface.　The　rich　Pt-CeO2　interface　facilitates　the　oxygen　migration,　enhancing　SO2　electrooxidation　and　ORR　activity.　The　catalysts　containing　10　and　20 wt.%　CeO2　show　the　best　performance,　i.e.,　peak　potentials　of　SO2　electrooxidation　are　0.06　and　0.09 V　lower　than　Pt/C,　respectively,　ORR　mass　activity　is　over　twofold　greater,　and　area-specific　activity　is　one　fourth　higher　than　Pt/C.　Oxygen　provided　by　CeO2　reduced　the　SO2　coverage　on　Pt　surface　and　changed　the　dominant　adsorbing　state　of　SO2,　hence,　is　vital　to　the　SO2　electrooxidation.　Besides,　accelerated　durability　test　confirmed　that　CeO2　could　also　improve　the　durability　of　Pt　based　catalysts.　©　2017