Binding energy of ruthenium submonolayers deposited on a Pt(111) electrode |
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| Authors: | C.?Vericat,M.?Wakisaka,R.?Haasch,P.?S.?Bagus,A.?Wieckowski author-information" > author-information__contact u-icon-before" > mailto:andrzej@scs.uiuc.edu" title=" andrzej@scs.uiuc.edu" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author |
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| Affiliation: | (1) Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;(2) Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;(3) Department of Chemistry, University of North Texas, Box 305070, Denton, TX 76203-5070, USA;(4) Present address: Clean Energy Research Center, University of Yamanashi, Takeda 4, 400-8510 Kofu, Japan |
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| Abstract: | We investigated the 3d5/2 core-level binding energy of Ru in Ru nanoislands spontaneously deposited on a Pt(111) electrode [Pt(111)/Ru], and the binding energies of 3d5/2 iodine and 1s CO adsorbed on Pt(111)/Ru by the use of X-ray photoelectron spectroscopy. Both iodine and CO were used as surface probes of the electronic properties of Pt(111)/Ru. Little difference was found in the binding energy of Ru in Pt(111)/Ru and in Ru(0001). However, the addition of Ru to Pt(111) induces major changes in the core-level binding energies of chemisorbed iodine and CO as referenced to those adsorbed on Ru(0001). We conclude that the iodine 3d5/2 and CO 1s C core levels experience higher electronic charge on Pt(111)/Ru than on Ru(0001), suggesting a charge transfer from Pt to Ru, or to a Ru-I  surface molecule within the deposit. The charge transfer from Pt to Ru is in agreement with the result of previous in situ electrochemical NMR investigations [P.K. Babu, H.S. Kim, A. Wieckowski, E. Oldfield (2003) J. Phys. Chem. B 107:7595] and confirms the general trend of reduction in the density of states of Pt due to alloying with Ru [J. McBreen, S. Mukerjee (1995) J. Electrochem. Soc. 142:3399]. Theoretical calculations are in progress to further interpret the origin of the binding-energy shifts observed in this study.Dedicated to Zbigniew Galus on the occasion of his 70th birthday |
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| Keywords: | X-ray photoelectron spectroscopy Binding energy Platinum Ruthenium Nanoislands Iodine |
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