Basamakli platin tek kristal yüzeyinde daha düşük potansiyelde birikme

It is investigated the underpotential deposition (UPD) of Tl and Pb on stepped Pt single-crystals vicinal to the (100)-surfaces, (like Pt (19,1,1), Pt (11,1,1), Pt (511), Pt (100) and Pt (111)) and the influence of Ru on the CO oxidation on Pt (19,1,1). For Ru deposition two peaks appeared at high potential in the CV in CO free solution. CO oxidation are performed on the Ru free and the Ru modified Pt-surface and it is shown that all peaks shifted to low potential with Ru deposited on the Pt (19,1,1) surface. Instead of one peak for the CO oxidation at 0.75 V on the Ru free Pt (19,1,1), on the Ru modified Pt surface two peaks are visible for the CO adsorbate at 0.58 and 0.63 V. When the potential is stoped at 0.54 V for 3 min., the second peak at 0.7 V is not affected. Tl/Pt (111) the sharpest peak at 0.76 V is explained as a phase-Transition from a - to a -overstructure of the Tl-Adlayer. Comparison of Tl and Pb has been done and it shows that Tl preferential decorated on step-sites and Pb preferential decorated on terrace-sites. And it is shown that Pb adsorption is more stable at (100) surface than (111) surface.