Clues for the Molecular-Level Understanding of Electrocatalysis on Single-Crystal Platinum Surfaces Modified by p-Block Adatoms - Fuel Cell Catalysis: A Surface Science Approach - page 222

Figure 7.5 Cyclic voltammogram of a Pt(775) electrode in 0.5 M H 2 SO 4 solution and a hard
sphere model of this surface. Sweep rate: 50 mV/s. In the hard sphere model, four atoms forming
the (110) step site have been identified in black.
this surface is shown as an inset. This surface can be considered as composed of (111)
terraces separated by (110) monoatomic steps. The voltammogram shows three clearly
differentiated regions: (i) a sharp peak at 0.12 V, corresponding to hydrogen adsorp-
tion on steps; (ii) a flat region between 0.06 and 0.35 V (overlapping with the peak at
0.12 V), corresponding to hydrogen adsorption on terrace sites; and (iii) a broad wave
between 0.4 and 0.6 V, corresponding to anion adsorption on terrace sites. Figure 7.6
Figure 7.6 Bismuth deposition on a Pt(775) electrode from 5 mMBi 3 þ þ 0.5 M H 2 SO 4
solution. The results have been divided into two graphs for the sake of clarity. Sweep rate:
50 mV/s.