“…Generally three or four anodic peaks and one or two cathodic ones are identified for iron. Although the considered mechanisms may be different, almost all authors agree that the first and second anodic peaks are associated to ferrous species formation [2][3][4][5][6][7][8]11,16,45,46 although these anodic peaks are sometimes attributed to Fe 3 O 4 formation 8,11,15,16 , or the first one to adsorbed hydrogen oxidation 14,16 . The third and fourth anodic peaks are associated to ferric species formation [2][3][4][5][6][7][8]11,14,15,45,46 .…”