The interactions of H2, CO and O2 on Bi-precovered Pt(111) surfaces have been examined using temperature programmed desorption (TPD), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), high resolution electron energy loss spectroscopy (HREELS) and low energy electron diffraction (LEED). For H2 and CO, Bi predominantly acts as a laterally dispersed, inert site blocker. Oxygen adsorption on Bi Pt(111) surfaces is considerably more complex, with significant enhancement of O2 dissociation at 100 K for both low (< 5 L) and higher O2 exposures. The data for CO and oxygen coadsorption with Bi is further examined to give some insight into the nature of lateral interactions in these adlayers. Electronic influences of Bi on adsorption energies are observed, but these are small in magnitude ( ≤ 1 kcal mol).
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry