Abstract
Abstract The structure of CO adsorbed on stepped electrode surfaces was studied by infrared reflection absorption method. Three kinds of (100) terrace surfaces which exhibited different step densities, Pt(1111)[6(100) × (111)], Pt(711)[4(100) × (111)] and Pt(100), were examined. At least four kinds of absorption bands of CO were found on each electrode surface: on-top CO on steps at 2045 cm−1, on-top CO on terraces at 2060 cm−1, symmetric bridge CO at 1880 cm−1, and asymmetric bridge CO at 1920 cm−1. The population at each CO adsorption site could be controlled by changing the electrode potential and CO coverage. At negative electrode potentials, CO preferred a bridge site on terrace atoms and an on-top site on step atoms, while at positive potentials, on-top CO on terraces predominated. The coverages at which on-top CO on the terrace surface started to appear were 0.40 on Pt(100), 0.35 on Pt(1111) and 0.25 on Pt(711).
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