Oxidation of monometallic Pd and bimetallic PdAu alloy surfaces are observed by ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) at an elevated pressure (100 mTorr O ambient). It is directly evidenced that the alloying with Au hinders the surface oxidation of PdAu surfaces compared with monometallic Pd surfaces. Remarkably, the oxidation behavior is clearly different between PdAu(111) and (100) surfaces. The (100) surface has a relatively Pd-rich surface composition, and the surface oxide layer is formed, whereas the (111) surface has a Au-rich composition, and the surface oxidation is quite limited. A combined approach of experimental and theoretical techniques reveals that Pd/Au surface composition and atomic arrangement are key factors determining the oxidation behavior.
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