Binding energy of ruthenium submonolayers deposited on a Pt(111) electrode
Binding energy of ruthenium submonolayers deposited on a Pt(111) electrode
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沉积在 Pt(111) 电极上的钌亚单层的结合能
DOI：
10.1007/s10008-004-0547-4
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Wiȩckowski
中科院分区：
文献类型：
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作者：
C. Vericat;M. Wakisaka;R. Haasch;P. Bagus;A. Wiȩckowski
利用X射线光电子能谱（XPS）研究了Pt（111）/Ru电极上自发沉积的Ru纳米岛中Ru的3d 5/2核能级结合能，以及3d 5/2碘和1 sCO吸附在Pt（111）/Ru上的结合能.用碘和CO作为Pt（111）/Ru的表面探针研究了Pt（111）/Ru的电子性质。Pt（111）/Ru和Ru（0001）中Ru的结合能差别不大。然而，添加Ru到Pt（111）诱导的核心水平的结合能的化学吸附碘和CO的主要变化，参考那些吸附在Ru（0001）。我们的结论是碘3d 5/2和CO 1 sC核心能级在Pt（111）/Ru上比在Ru（0001）上经历更高的电子电荷，这表明电荷从Pt转移到Ru，或者转移到存款内的Ru-I“表面分子”。从Pt到Ru的电荷转移与先前的原位电化学NMR研究结果一致[P.K.巴布，H.S. Kim，A. Wieckowski，E. Oldfield（2003）J. Phys. Chem. B107：7595]并证实了由于与Ru合金化而导致Pt态密度降低的总趋势[J. McBreen，S. Mukerjee（1995）J. Electrochem. 142：3399]。理论计算正在进行中，以进一步解释本研究中观察到的结合能位移的起源。
We investigated the 3d5/2core-level binding energy of Ru in Ru nanoislands spontaneously deposited on a Pt(111) electrode [Pt(111)/Ru], and the binding energies of 3d5/2iodine and 1sCO 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 3d5/2and CO 1sC 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. B107:7595] 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.