Unraveling Charge State of Supported Au Single-Atoms during CO Oxidation

Xiong Zhou; Qian Shen; Kaidi Yuan; Wenshao Yang; Qiwei Chen; Zhenhua Geng; Jialin Zhang; Xiang Shao; Wei Chen; Guoqin Xu; Xueming Yang; Kai Wu

doi:10.1021/jacs.7b10394

Unraveling Charge State of Supported Au Single-Atoms during CO Oxidation

J Am Chem Soc. 2018 Jan 17;140(2):554-557. doi: 10.1021/jacs.7b10394. Epub 2018 Jan 4.

Authors

Xiong Zhou^{1

2}, Qian Shen^{1

2}, Kaidi Yuan², Wenshao Yang³, Qiwei Chen¹, Zhenhua Geng³, Jialin Zhang², Xiang Shao⁴, Wei Chen², Guoqin Xu², Xueming Yang³, Kai Wu¹

Affiliations

¹ BNLMS, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
² Department of Chemistry, National University of Singapore , Singapore 117543, Singapore.
³ State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics , Dalian 116023, Liaoning, China.
⁴ Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China , Hefei 230026, China.

PMID: 29293332
DOI: 10.1021/jacs.7b10394

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.

Publication types

Research Support, Non-U.S. Gov't