Geometric edge effect on the interface of Au/CeO_(2)nanocatalysts for CO oxidation  

作　　者：Hongpeng LiuZhongliang Cao Siyuan Yang Qingye Ren Zejian Dong Wei Liu Zi-An Li Xing Chen Langli Luo 

机构地区：[1]Institute of Molecular Plus,Tianjin University,Tianjin 300072,China [2]Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics(DICP),Chinese Academy of Sciences,Dalian 116023,China [3]State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,and School of Physical Science and Technology,Guangxi University,Nanning 530004,China [4]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《Nano Research》2024年第6期4986-4993,共8页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.22172110 and 12364018);the Guangxi Science and Technology Major Program(No.AA23073019).

摘　　要：The oxide supports play a crucial role in anchoring and promoting the active metal species by geometric confinement and chemical interaction.The design and synthesis of the well-defined oxide support with specific morphology such as size,shape,and exposed facets have attracted extensive research efforts,which directly reflects on their catalytic performance.In this study,using an Au/CeO_(2)-nanorod model catalyst,we demonstrate an edge effect on the Au/CeO_(2)interfacial structure,which shows a prominent effect on the structure-performance relationship in the CO oxidation reaction.This specific“edge-interface”structure features an“edge-on”Au nanoparticles position on rod-shaped CeO_(2)support,confirmed by atomic-scale electron microscopy characterization,which introduces additional degrees of freedom in coordination environment,chemical state,bond length,and strength.Combined with theocratical calculations and in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)investigations,we confirmed that this“edge-interface”has distinct adsorption properties due to the change of O vacancy formation energy as well as the chemical states of Au resulting from the electron transfer and redistribution between the metal and the support.These results demonstrate a non-conventional geometric effect of rod-shaped supported metal catalysts on the catalytic performance,which could provide insights into the atomic-precise utilization of catalysts.

关 键 词：CERIA nanorod supported catalyst edge-effect atomic scale 

分 类 号：O64[理学—物理化学]