Surface electrochemistry of CO on Pt(): anion effects

摘要: In-situ studies of CO adsorption by surface x-ray scattering (SXS) and Fourier transform infrared (FTIR) spectroscopy techniques are used to create the link between macroscopic kinetic rates oxidation microscopic level understanding structure/site occupancy on Pt(111). A remarkable difference in activity was observed alkaline acid solutions. In solution proceeds at low overpotential (<0.2 V) reaction adsorbed OH, latter forming selectively hydrogen underpotential potential region defect sites. these sites blocked specific anions, consequently a containing Br{sup -} ignition is shifted positively 0.6 V. Anions supporting electrolytes also have dramatic effects both range stability domain size p(2x2)-3CO structure which formed 0.05 The stability/domain this increases from KOH (ca. 30 {angstrom} < E 0.3V), HClO{sub 4} 140 0.6V) + (ca 350 0.8V). larger ordered domains p(2x2)-CO{sub ad} are, less active towards oxidation.