| AVS 56th International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session I and Mort Traum Finalists |
| Presenter: | B.S. Mun, Hanyang University, Korea and Lawrence Berkeley National Laboratory |
| Authors: | Y.-S. Kim, Lawrence Berkeley National Laboratory and Hanyang University, Korea B.S. Mun, Hanyang University, Korea and Lawrence Berkeley National Laboratory V. Stamenkovic, Argonne National Laboratory N. Markovic, Argonne National Laboratory A. Bostwick, Lawrence Berkeley National Laboratory E. Rotenberg, Lawrence Berkeley National Laboratory P.N. Ross, Lawrence Berkeley National Laboratory |
| Correspondent: | Click to Email |
With x-ray photoemission spectroscopy (XPS), surface electronic structures and chemical states of O2 on Pt3M [111] single crystals are investigated at various surface temperature, T = 30~150K. At T=30K, both physisorbed and chemisorbed oxygen molecules are present on the surfaces. As the surface temperature is increased to 150K, molecular oxygen on the surface undergoes a phase transition from weakly bounded physisorbed states to chemisorbed states, i.e. an atomic oxygen states. From the measurements of Fermi surface with angle-resolved XPS, Pt [111] surface shows a clear signature of charge transfer along M direction upon the adsorption of oxygen molecules. However, all other Pt3M surfaces exhibit little changes near Fermi surface at various temperatures. The correlation between the electrochemical reactivity and surface electronic structures on Pt3M will be presented.