ИСТИНА

The Cuad accumulation was carried out by potential cycling between 50 and 350 mV, then anodic limit of the cycling was increased and the amount of deposited Cu was estimated by integration of Cu desorption peaks between 550 and 950 mV. Rough estimation shows that although similar amounts of Cuad was accumulated on the electrodes (ca. 0.2-0.4 ML), the rate of nitrate reduction is maximal for wide terraces of Pt(610) and minimal (ca. 20 times lower) for narrow terraces of Pt(210). The rate of nitrate reduction is much higher on Cu-modified electrodes as compared with platinum ones and takes place mainly on the terraces of the stepped surfaces. The rate of the process is determined not only by the amount of Cu adatoms but also in a great extent by the structure of the adlayer on the Pt(hkl)+Cuad surfaces.