Underpotential deposition of copper on Pt(S)-[n(111) × (100)] electrodes in sulfuric acid solution

The formation of two Ag UPD layers on stepped Pt single crystal electrodes and their restructuring by co-adsorption of CO

“…This leads to the observed peak broadening and appearance of peak B. For Cu upd on stepped Pt surfaces, three peaks are observed in cyclic voltammetry [25][26][27]: The largest peak at intermediate potentials corresponds to Cu deposition at terraces, the other two are related to step sites; deposition at the step edge (step decoration), involving a larger number of nearest Pt neighbours, (5 instead of 3 at (1 1 1) terrace sites) occurs at a more positive potential, that at the terrace edge, the "last row" of monolayer deposition, in which Cu atoms are coordinated to less than 3 Pt atoms, occurs at the most negative potentials For Ag upd we assume similar relative adsorption energies for the 3 sites. However, in the case of Ag upd, the energetics is too much influenced by the competitive oxygen adsorption, and therefore, instead of separate peaks, only a peak broadening is observed.…”

Preferentially (100) oriented Pt thin film with less than a monolayer of Bi, Pd and Sb adatoms: application for formic acid oxidation

“…Earlier single crystal studies have shown that the stripping of Cu UPD from Pt (111) terraces occurs at 0.34 V, whereas it occurs at 0.40 V on Pt(100) steps [40]. It is also known that the stripping of Cu UPD from the (110) sites occurs at a more negative potential than on (111) terraces [41], and that Cu UPD on Pt (100) terraces is the most stable of all, occurring only at 0.49 V (at a sweep rate of 50 mV s À1 ) [43].…”

“…These parameters were chosen based on linear sweep experiments (data not shown) and existing literature [39][40][41][42]. The resulting Cu stripping experiment is shown in Fig.…”

Towards a determination of the active surface area of polycrystalline and nanoparticle electrodes by Cu upd and CO oxidation

“…lts peak position its very much dependent on sweep rate (at 10 mV s )1 the peak is centered at 650 mV), and at sweep rates below 0.1 mV s )1 , a peak splitting is sometimes observed [29][30][31][32][33]. On Ru covered Pt(111), the peak for Cu at Pt sites shifts to lower potentials; the shift of the deposition peaks to higher potentials in the cathodic sweep indicates a higher reversibility, which is probably caused by the disorder induced by Ru islands.…”