Core level spectroscopy and reactivity of coadsorbed K+O layers on reconstructed Rh(110) surfaces
Core level spectroscopy and reactivity of coadsorbed K+O layers on reconstructed Rh(110) surfaces
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DOI：
10.1063/1.1625641
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发表时间：
2003-12
影响因子：
4.4
通讯作者：
S. Günther;H. Marbach;R. Imbihl;A. Baraldi;S. Lizzit;M. Kiskinova
中科院分区：
文献类型：
--
作者：
S. Günther;H. Marbach;R. Imbihl;A. Baraldi;S. Lizzit;M. Kiskinova
本文用高分辨X射线光电子能谱（XPS）和低能电子衍射（LEED）研究了Rh（110）表面K+O共吸附层中氧和钾的成键特征及相互作用。Rh 3d 5/2，K 2 p，和O 1 s光谱和LEED图案被用作指纹的界面反应和结构变化。当氧覆盖率超过一个单层时，在致密的K+O吸附层的存在下，基底的化学状态发生了巨大的变化。共吸附的钾对氧的“反应性”的影响进行了探讨，通过以下的O 1 s光谱的演变过程中滴定与H2。考虑到K对O2和H2的解离吸附以及对共吸附物种的键合的影响，讨论了随着K覆盖度的增加，表面氧吸附能力的增强和H2O形成速率的降低.
The bonding character of oxygen and potassium and the interactions in K+O coadsorbed layers on a Rh(110) surface have been studied by means of high resolution x-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). The Rh 3d5/2, K 2p, and O 1s spectra and LEED patterns were used as fingerprints for the interfacial reactions and the structural changes. Dramatic changes in the chemical state of the substrate occur in the presence of dense K+O adlayers, when the oxygen coverage exceeds one monolayer. The effect of coadsorbed potassium on the “reactivity” of oxygen was probed by following the evolution of the O 1s spectra during titration with H2. The enhanced surface capacity for oxygen adsorption and the reduced rate of H2O formation with increasing K coverage were discussed considering the influence of K on the dissociative adsorption of O2 and H2 and on the bonding of the coadsorbed species.