Abstract
Developing platinum-group-metal(PGM)catalysts possessing strong metal-support interaction and con-trollable PGM size is urgent for the sluggish oxygen reduction reaction(ORR)in proton-exchange mem-brane fuel cells.Herein,we propose an in-situ self-assembled reduction strategy to successfully induce highly-dispersed sub-3nm platinum nanoparticles(Pt NPs)to attach on resin-derived atomic Co coordi-nated by N-doped carbon substrate(Pt/CoSA-N-C)for ORR.To be specific,the interfacial electron inter-action effect,along with a highly robust CoSA-N-C support endow the as-fabricated Pt/CoSA-N-C catalyst with significantly enhanced catalytic properties,i.e.,a mass activity(MA)of 0.719 A/mgPt at 0.9 ViR-free and a reduction of 24.2％in MA after a 20,000-cycles test.Density functional theory(DFT)calculations demonstrate that the enhanced electron interaction between Pt and CoSA-N-C support decreases the d-band center of Pt,which is in favor of lowering the desorption energy of*OH on Pt/CosA-N-C surface and accelerating the formation of H2O,thus enhance the instinct activity of ORR.Furthermore,the higher binding energy between Pt and CoSA-N-C compared to Pt and C indicates that the migration of Pt has been suppressed,which theoretically explains the improved durability of Pt/CoSA-N-C.Our work offers an enlightenment on constructing composite Pt-based catalysts with multiple active sites.
基金项目
国家自然科学基金(22169005)
国家自然科学基金(22209186)
国家自然科学基金(22068009)
国家自然科学基金(22262006)
Science and Technology Support Project of Guizhou Provincial Science and Technology Department(ZK[2023]050)
Science and Technology Support Project of Guizhou Provincial Science and Technology Department([2023]403)
Open Project of Institute of Dualcarbon and New Energy Technology Innovation and Development of Guizhou Province(DCRE-2023-06)
中国科学院青年创新促进会项目(2023343)
Selfdeployed Projects of Ganjiang Innovation Academy,CAS(E355F006)
维普
万方数据