Thin films of TiO_x on Pd(100) and Pd(111) have been investigated with respect to their properties after oxidation and reduction cycles. High-resolution photoemission spectroscopy (HRPES) and low energy electron diffraction (LEED) have been applied to characterize the thin film oxidation states and structure before and after oxidation and reduction under ultrahigh vacuum conditions. Fully oxidized TiO₂ films were formed on both surfaces. These structures display Moiré patterns in LEED, in one dimension for Pd(100) and in two dimensions for Pd(111), and they have previously not been reported for TiO₂/Pd. The oxidation process causes strong reduction in the interaction between the oxide thin film and the Pd substrate, most significantly for Pd(111). Reversible oxidation/reduction cycling of TiO_x thin films on Pd(111) and Pd(100) was possible.

中文翻译：

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Pd（111）和Pd（100）上TiO _x薄膜的氧化和还原

研究了Pd（100）和Pd（111）上TiO _x薄膜的氧化和还原循环后的性能。高分辨率光电发射光谱（HRPES）和低能电子衍射（LEED）已被用于表征在超高真空条件下氧化和还原之前和之后的薄膜氧化态和结构。在两个表面上都形成了完全氧化的TiO ₂膜。这些结构在LEED中显示的莫尔图案，在一维的Pd（100）和二维的Pd（111）中，以前没有报道过TiO ₂/钯 氧化过程会导致氧化物薄膜与Pd衬底之间的相互作用强烈降低，对于Pd（111）最为明显。TiO _x薄膜在Pd（111）和Pd（100）上的可逆氧化/还原循环是可能的。