Abstract
Slightly miscut TiO2(110) surfaces with high densities of step edges were studied by scanning tunneling microscopy (STM), temperature-programmed desorption (TPD), and ultraviolet photoemission spectroscopy (UPS). STM measurements provided information on the surface morphology and the density of defects and adstructures, whereas UPS measurements revealed information on the electronic structure and the surface reduction state before and after the conduction of O2 TPD experiments. It was found that the presence of step edges and adstructures has a strong influence on the O2–TiO2 interaction. The growth of TiOx islands occurred in the same way on stepped surfaces as on flat TiO2(110) surfaces, but the island densities were smaller. TPD measurements revealed that significantly less O2 desorbed between 300 and 410 K from stepped surfaces than from surfaces with large terraces. Importantly, the stepped TiO2 surfaces were characterized by clearly lower surface reduction states than flat TiO2(110) surfaces.
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