A density functional theory study on the adsorption of CO and O2 on Cu-terminated Cu2O (111) surface

Li Min; Zhang Jun-Ying; Zhang Yue; Wang Tian-Min

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A density functional theory study on the adsorption of CO and O2 on Cu-terminated Cu2O (111) surface

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The adsorptions of CO and O2 molecules individually on the stoichiometric Cu-terminated Cu2O (111) surface are investigated by first-principles calculations on the basis of the density functional theory.The calculated results indicate that the CO molecule preferably coordinates to the Cu2 site through its C atom with an adsorption energy of -1.69 eV,whereas the O2 molecule is most stably adsorbed in a tilt type with one O atom coordinating to the Cu2 site and the other O atom coordinating to the Cu1 site,and has an adsorption energy of -1.97 eV.From the analysis of density of states,it is observed that Cu 3d transfers electrons to 2π orbital of the CO molecule and the highest occupied 5σorbital of the CO molecule transfers electrons to the substrate.The sharp band of Cu 4s is delocalized when compared to that before the CO molecule adsorption,and overlaps substantially with bands of the adsorbed CO molecule.There is a broadening of the 2π orbital of the O2 molecule because of its overlapping with the Cu 3d orbital,indicating that strong 3d-2π interactions are involved in the chemisorption of the O2 molecule on the surface.

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《中国物理：英文版》 |2012年第6期|456-461|共6页
作者
Li Min; Zhang Jun-Ying; Zhang Yue; Wang Tian-Min;
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Key Laboratory of Micro-nano Measurement,Manipulation and Physics(Ministry of Education),Department of Physics,Beihang University,Beijing 100191,China;

Key Laboratory of Micro-nano Measurement,Manipulation and Physics(Ministry of Education),Department of Physics,Beihang University,Beijing 100191,China;

School of Materials Science and Engineering,Beihang University,Beijing 100191,China;

Key Laboratory of Micro-nano Measurement,Manipulation and Physics(Ministry of Education),Department of Physics,Beihang University,Beijing 100191,China;

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A density functional theory study on the adsorption of CO and O2 on Cu-terminated Cu2O (111) surface

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