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JOURNAL OF MECHANICAL ENGINEERING  > 2020  >  33(3): 349-356.
Shi-hui Dong, Wang Ao-lei, Zhao Jin, Shi-jing Tan, Bing Wang. Interaction of CO and O$ _\textbf{2} $ with Supported Pt Single-Atoms on TiO$ _\textbf{2} $(110)[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 33(3): 349-356. doi: 10.1063/1674-0068/cjcp1911198
Citation: Shi-hui Dong, Wang Ao-lei, Zhao Jin, Shi-jing Tan, Bing Wang. Interaction of CO and O$ _\textbf{2} $ with Supported Pt Single-Atoms on TiO$ _\textbf{2} $(110)[J]. JOURNAL OF MECHANICAL ENGINEERING, 2020, 33(3): 349-356. doi: 10.1063/1674-0068/cjcp1911198
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Interaction of CO and O$ _\textbf{2} $ with Supported Pt Single-Atoms on TiO$ _\textbf{2} $(110)

doi: 10.1063/1674-0068/cjcp1911198
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  • Corresponding author: Bing Wang, E-mail:bwang@ustc.edu.cn
  • Received Date: 11 Nov 2019
  • Accepted Date: 26 Dec 2019
  • Publish Date: 17 Mar 2020
    Abstract
  • In view of the high activity of Pt single atoms in the low-temperature oxidation of CO, we investigate the adsorption behavior of Pt single atoms on reduced rutile TiO$ _2 $(110) surface and their interaction with CO and O$ _2 $ molecules using scanning tunneling microscopy and density function theory calculations. Pt single atoms were prepared on the TiO$ _2 $(110) surface at 80 K, showing their preferred adsorption sites at the oxygen vacancies. We characterized the adsorption configurations of CO and O$ _2 $ molecules separately to the TiO$ _2 $-supported Pt single atom samples at 80 K. It is found that the Pt single atoms tend to capture one CO to form Pt-CO complexes, with the CO molecule bonding to the fivefold coordinated Ti (Ti$ _{5 \rm{c}} $) atom at the next nearest neighbor site. After annealing the sample from 80 K to 100 K, CO molecules may diffuse, forming another type of complexes, Pt-(CO)$ _2 $. For O$ _2 $ adsorption, each Pt single atom may also capture one O$ _2 $ molecule, forming Pt-O$ _2 $ complexes with O$ _2 $ molecule bonding to either the nearest or the next nearest neighboring Ti$ _{5 \rm{c}} $ sites. Our study provides the single-molecule-level knowledge of the interaction of CO and O$ _2 $ with Pt single atoms, which represent the important initial states of the reaction between CO and O$ _2 $.

     

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