Abstract
The use of Pt-Rh catalysts is central in various industrial processes, including ammonia oxidation for NOx abatement and NH₃ slip technologies. To explain and optimize Pt-Rh catalyst performance, a detailed understanding of their nanoscopic surface structure is essential. In our research, we employ scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and low-energy electron diffraction (LEED) to examine the growth, elemental nanostructuring, and reconstruction behaviors of Pt-Rh near-surface alloys grown on Rh(111) and Pt(111) close-packed surfaces (ccp). In this talk, we will share our latest findings on the formation and stability of the previously unreported honeycomb surface structure observed on Rh/Pt(111) surfaces.