The use of Pt–Rh catalysts is central in a number of industrial processes, and to explain their performance it is essential to have a solid understanding of their nanoscopic surface structure. Here we use scanning tunneling microscopy to investigate the growth, elemental nanostructuring, and reconstruction behavior of various Pt–Rh near-surface alloys (NSA) on fcc Rh(111) and Pt(111). We document the formation of a novel lamellar island reconstruction atop Pt/Rh(111) islands as well as network reconstructions on Rh/Pt(111), similar to those previously observed for Pt/Pt(111). The extended roadmap for preparation of PtRh NSAs allows comparison with other homo/heteroepitaxial metal/fcc surfaces and provides a facile guideline for producing tailor-made model catalytic surfaces.
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