期刊
CHEMICAL PHYSICS LETTERS
卷 493, 期 4-6, 页码 269-272出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2010.05.053
关键词
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资金
- National Science Council, Republic of China [NSC 97-2113-M-492-001-MY2, NSC 98-2113-M-034-002-MY2]
- Chinese Culture University
- Taiwan National Center for Theoretical Sciences ( NCTS)
Our calculations with spin-polarized density functional theory and on-site Coulomb interactions ( DFT + U) have showed that ( i) OH groups can facilitate O-2 adsorption on CeO2 even at low OH coverages; ( ii) the OH groups posses a long-range and coverage effects on the O-2 adsorption; and ( iii) the adsorbed O-2 can readily diffuse along the surface Ce atoms in the presence of OH groups, and this may be a large O-2 supply for CO oxidation on the interface of noble-metal/CeO2. We provide the evidence that O-2 is supplied by superoxide species on CeO2 in the presence of OH and can diffuse to the interface of noble-metal/CeO2 for CO oxidation. (C) 2010 Elsevier B. V. All rights reserved.
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