Measuring Charge Transfer between Adsorbate and Metal Surfaces

Charge transfer between dissimilar atoms is an essential step for many chemical processes such as corrosion and heterogeneous catalysis, but directly probing the charge transfer has been a challenge. Using the oxygen–copper system as an example, we show that synchrotron-based ambient pressure X-ray...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2020-08, Vol.11 (16), p.6827-6834
Main Authors: Wang, Jianyu, Lu, Deyu, Li, Chaoran, Zhu, Yaguang, Boscoboinik, Jorge Anibal, Zhou, Guangwen
Format: Article
Language:English
Subjects:
MATERIALS SCIENCE
Physical Insights into Chemistry, Catalysis, and Interfaces
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Summary:Charge transfer between dissimilar atoms is an essential step for many chemical processes such as corrosion and heterogeneous catalysis, but directly probing the charge transfer has been a challenge. Using the oxygen–copper system as an example, we show that synchrotron-based ambient pressure X-ray photoelectron spectroscopy can be employed to monitor the charge transfer between adsorbates and metal surfaces. It is shown that oxygen chemisorption on Cu surfaces results in an Auger process that differs from the photoexcitation-induced Coster–Kroning transition and can be used to derive the degree of charge transfer in combination with ab initio calculations. The identified chemisorption-induced Auger process may have broader implications for its use as a fingerprint to monitor bond formation and charge transfer between dissimilar atoms.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.0c02002