Surface segregation is ubiquitous in multi-component materials and is of great important for catalysis but little is known on the surface structure under graphene encapsulation.Here,we show that the graphene encapsulated CoCu performs well for the electrocatalytic oxidation of 5-hydroxymethylfurfural(HMF)to 2,5-furandicarboxylic acid(FDCA)with the onset potential before 1.23 VRHE and a nearly 100％selectivity of FDCA under 1.4 VRHE.From the experimental results,the unprecedented catalytic performance was attributed to local structural distortion and sub-nanometer lattice composition of the CoCu surface.We accurately show the dispersed Cu doped Co3O4 nano-islands with a lot of edge sites on the bimetallic Co-Cu surface.While,the gradient components effectively facilitate the establishment of built-in electric field and accelerate the charge transfer.Theoretical and experimental results reveal that the surface Co and neighbouring Cu atoms in sub-nanometer lattice synergistically promote the catalysis of HMF.This work offers new insights into surface segregation in tuning the element spatial distribution for catalysis.

State Key Laboratory of Chem/Bio-Sensing and Chemometrics,Advanced Catalytic Engineering Research Center of the Ministry of Education,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,Hunan,China;School of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan,China

[1]Yanwei Zhu;Jianqiao Shi;Yingying Li;Yuxuan Lu;Bo Zhou;Shuangyin Wang;Yuqin Zou-.Understanding the surface segregation behavior of bimetallic CoCu toward HMF oxidation reaction)[J].能源化学,2022(11):85-90

CoCu,furandicarboxylic

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