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Herein, we use variable-temperature scanning tunneling microscopy at elevated pressure conditions combined with X-ray photoelectron spectroscopy measurements to investigate the surface structures and chemical states that evolve when a CuZn\/Cu(111) surface alloy is exposed to reaction gas mixtures. In CO<jats:sub>2<\/jats:sub> hydrogenation conditions, Zn stays embedded in the CuZn surface, but once CO gas is added to the mixture, the Zn segregates onto the Cu surface. The Zn segregation is CO-induced, and establishes a new dynamic state of the catalyst surface where Zn is continually exchanged at the Cu surface. Candidates for the migrating few-atom Zn clusters are further identified in time-resolved imaging series. The findings point to a significant role of CO affecting the distribution of Zn in the multiphasic ZnO\/CuZn\/Cu catalysts.<\/jats:p>","DOI":"10.1038\/s41467-024-48168-6","type":"journal-article","created":{"date-parts":[[2024,5,8]],"date-time":"2024-05-08T11:01:53Z","timestamp":1715166113000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Visualizing the gas-sensitive structure of the CuZn surface in methanol synthesis catalysis"],"prefix":"10.1038","volume":"15","author":[{"given":"Sigmund","family":"Jensen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mathias H. 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