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Oxygen vacancy pairs on CeO2(110): A DFT + U study |
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| Authors: | Zongxian Yang Xiaohu Yu Shunfang Li |
| Institution: | a College of Physics and Information Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China b School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, People's Republic of China c Materials Chemistry, The Ångström Laboratory, Uppsala University, Box 538, SE-75121 Uppsala, Sweden |
| Abstract: | Oxygen vacancy pairs have been suggested to play a role in the reduction of NO molecules on ceria and for the oxidation processes of reducible rare-earth oxides. The formation energy of the oxygen vacancy pairs and the changes in the structural and electronic properties of the ceria (110) surface with oxygen vacancy pairs are investigated using density-functional theory (DFT + U) methodology within the generalized gradient approximation. It is found that the excess electrons localize on the Ce ions neighbouring the vacancies, and the most stable structure for the oxygen vacancy pairs on the ceria (110) surface is at next-nearest-neighbour site. |
| Keywords: | 74 62 Dh 71 15 Mb 71 15 Nc 73 20 At |
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