POTENTIAL OF ZERO TOTAL CHARGE OF PLATINUM SINGLE CRYSTAL ELECTRODES

摘要

The application of the CO charge displacement methodology to the determination of potentials of zero total charge (pztc) of platinum single crystal electrodes is reviewed. This methodology is applied to the study of the dependence of the pztc of platinum single crystal electrodes on pH and step density. In the first case, it is found that the pztc depends on pH in different ways for each platinum basal plane electrode, which demonstrate that not only the pztc is structure sensitive but also its dependence with pH. On the other hand, the dependence of the pztc on the step density has been studied for two sets of stepped platinum electrodes: Pt(s)[n(111)X(111)] and Pt(s)[n(111)X(100)]. The introduction of steps causes a linear decrease in the pztc in the lower range of step density. Potentials of zero free charge (pzfc) have been estimated and compared with an analogous decrease of the work function values reported in the literature for the same surfaces.