Comment on “STM study of the (111) and (100) surfaces of PdAg, Surf. Sci. 417 (1998) 292–300" and references therein

Journal Article · 04 February 2022 · Surface Science

DOI: https://doi.org/10.1016/j.susc.2022.122048 · OSTI ID:1846153

Egle, Tobias ^[1]; Cavanaugh, Timothy J. ^[2]; Friend, Cynthia M.  ^[2]

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1. Harvard Univ., Cambridge, MA (United States); Harvard
2. Harvard Univ., Cambridge, MA (United States)

Investigation of isolated, single atoms on the surfaces of alloys is of great interest in the field of heterogeneous catalysis. Prior studies by Nieuwenhuys, etal. [Surf. Sci. 417 (1998) 292–300 and references therein] showed that annealing the (111) surface of a PdAg bulk alloy yielded a surface with ~5% Pd, predominantly in the form of single atoms, rendering it an ideal model for investigating the reactivity of single Pd atoms. Herein, new evidence is reported that establishes the bulk composition of the PdAg(111) alloy studied previously is 67 % Ag and 33 % Pd, whereas it was reported to be 33 % Ag and 67 % Pd in the prior studies. Furthermore, the bulk composition of a crystal derived from the same PdAg alloy boule used previously was determined using energy-dispersive X-ray spectroscopy (EDS)—a bulk sensitive technique. Surface-sensitive measurements, including X-ray photoelectron spectroscopy, were also performed and are in good agreement with the prior studies by Nieuwenhuys, etal.

• Research Organization: Harvard Univ., Cambridge, MA (United States); Northwestern Univ., Evanston, IL (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0012573; SC0021314
• OSTI ID: 1846153
• Journal Information: Surface Science, Journal Name: Surface Science Vol. 720; ISSN 0039-6028
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English