Title:	Understanding the Role of Electronic Effects in CO on the Pt-Sn Alloy Surface via Band Structure Measurements
Authors:	Jung, Jongkeun Kang, Sungwoo Nicolai, Laurent Christophe Hong, Jisook Minár, Jan Song, Inkyung Kyung, Wonshik Cho, Soohyun Kim, Beomseo Denlinger, Jonathan D. Cadete Santos Aires, Francisco José Ehret, Eric Ross, Philip Shim, Jihoon Nemšák, Slavomir Noh, Doyoung Han, Seungwu Kim, Changyoung Mun, Bongjin Simon
Citation:	JUNG, J. KANG, S. NICOLAI, LCH. HONG, J. MINÁR, J. SONG, I. KYUNG, W. CHO, S. KIM, B. DENLINGER, JD. CADETE SANTOS AIRES, FJ. EHRET, E. ROSS, P. SHIM, J. NEMŠÁK, S. NOH, D. HAN, S. KIM, CH. MUN, BS. Understanding the Role of Electronic Effects in CO on the Pt-Sn Alloy Surface via Band Structure Measurements. ACS Catalysis, 2022, roč. 12, č. 1, s. 219-225. ISSN: 2155-5435
Issue Date:	2022
Publisher:	American Chemical Society
Document type:	článek article
URI:	2-s2.0-85121656162 http://hdl.handle.net/11025/51288
ISSN:	2155-5435
Keywords in different language:	angle-resolved photoelectron spectroscopy;CO adsorption;Pt alloy;pi back-donation;orbital character
Abstract in different language:	Using angle-resolved photoemission spectroscopy, we show direct evidence for charge transfer between adsorbed molecules and metal substrates, i.e., chemisorption of CO on Pt(111) and Pt-Sn/Pt(111) 2 x 2 surfaces. The observed band structures show a unique signature of charge transfer as CO atoms are adsorbed, revealing the roles of specific orbital characters participating in the chemisorption process. As the coverage of CO increases, the degree of charge transfer between CO and Pt shows a clear difference to that of Pt-Sn. With comparison to density functional theory calculation results, the observed distinct features in the band structure are interpreted as back-donation bonding states formed between the Pt molecular orbital and the 2 pi orbital of CO. Furthermore, the change in the surface charge concentration, measured from the Fermi surface area, shows that the Pt surface has a larger charge concentration change than the Pt-Sn surface upon CO adsorption. The differences between Pt and Pt-Sn surfaces are due to the effect of Pt-Sn intermetallic bonding on the interaction of CO with the surface.
Rights:	© authors
Appears in Collections:	Články / Articles (RAM) OBD

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