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Unraveling Charge State of Supported Au Single-Atoms during CO Oxidation
Xiong Zhou1,2, Qian Shen1,2, Kaidi Yuan2
1BNLMS, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
Abstract:
Thermally stable Au single-atoms supported by monolayered CuO grown at Cu(110) have been successfully prepared. The charge transfer from the CuO support to single Au atoms is confirmed to play a key role in tuning the activity for CO oxidation. Initially, the negatively charged Au single-atom is active for CO oxidation with its adjacent lattice O atom depleted to generate an O vacancy in the CuO monolayer. Afterward, the Au single-atom is neutralized, preventing further CO reaction. The produced O vacancy can be healed by exposure to O2 at 400 K and accordingly the reaction activity is restored.
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