Fig. 6. Upper panels are the cyclic voltammograms of (a) Pt(111) and (b) PdMLPt(111) in 0.1 M HClO4 recorded at 50 mV s−1. Black lines in the lower panels show the most stable adsorption free energies and the most favorable coverages as a function of potential for the adsorption of hydrogen (*H), hydroxide (*OH) and oxygen (*O). Hydrogen coverage increases from 1/9 to 1 ML for Pt(111) and from 2/9 ML to 1 ML for PdMLPt(111). Perchlorate adsorption (*ClO4) is shown in red at a 1/9 ML coverage.
