Enhanced Stability of Pt-Cu Single-Atom Alloy Catalysts: In Situ Characterization of the Pt/Cu(111) Surface in an Ambient Pressure of CO

Simonovis, Juan Pablo; Hunt, Adrian; Palomino, Robert M.; Senanayake, Sanjaya D.; Waluyo, Iradwikanari

doi:10.1021/acs.jpcc.8b00078

Title: Enhanced Stability of Pt-Cu Single-Atom Alloy Catalysts: In Situ Characterization of the Pt/Cu(111) Surface in an Ambient Pressure of CO

Journal Article · Mon Feb 05 00:00:00 EST 2018 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.8b00078· OSTI ID:1436270

Simonovis, Juan Pablo ^[1];

^[1]; Palomino, Robert M. ^[1];

^[1];

^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

The interaction between a catalyst and reactants often induce changes in the surface structure and composition of the catalyst, which, in turn, affect its reactivity. Therefore, it is important to study such changes using in situ techniques under well-controlled conditions. We have used ambient pressure X-ray photoelectron spectroscopy (AP-XPS) to study the surface stability of a Pt/Cu(111) single atom alloy (SAA) in an ambient pressure of CO. By directly probing the Pt atoms, we found that CO causes a slight surface segregation of Pt atoms at room temperature. In addition, while the Pt/Cu(111) surface demonstrates poor thermal stability in UHV, where surface Pt starts to diffuse to the subsurface layer above 400 K, the presence of adsorbed CO enhances the thermal stability of surface Pt atoms. Furthermore, we also found that temperatures above 450 K cause a restructuring of the subsurface layer, which consequently strengthens the CO binding to the surface Pt sites, likely due to the presence of neighboring subsurface Pt atoms.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1436270

Report Number(s):: BNL-203627-2018-JAAM; TRN: US1900166

Journal Information:: Journal of Physical Chemistry. C, Vol. 122, Issue 8; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 57 works

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The Synergy of Dilute Pd and Surface Oxygen Species for Methane Upgrading on Au ₃ Pd(111) Do, Quan K.; Tran, Hung-Vu; Wang, Shengguang Energy Technology, Vol. 8, Issue 8 https://doi.org/10.1002/ente.201900732	journal	September 2019

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Title: Enhanced Stability of Pt-Cu Single-Atom Alloy Catalysts: In Situ Characterization of the Pt/Cu(111) Surface in an Ambient Pressure of CO

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