The effect of halides on the structure of copper underpotential-deposited onto Pt(111): a low-energy electron diffraction and X-ray photoelectron spectroscopy study

The Underpotential Deposition of Copper on Pt(311): Site Selective Deposition and Anion Effects

“…11). In the case of the Pt(lI l) electrode, the typical voltarnmteic profile is observed, with two peaks in both the stripping and the deposition of copper as described previously [9,11 ]. The total charge density in this case is equal to 570 =C/cm2, hich is a strikingly high value.…”

“…8), one can observe a behavior similar to that in the case of the absence of chloride. The voltammetric behavior for the Pt(l 11) electrode is well known showing two sharp peaks in both the positive and the negative going sweeps (9,11]. In this case, the coulometric charge due to the desorption of a monolayer is equal to 470 tC/cm 2 [9].…”

“…There have been numerous studies devoted to the phenomenon of underpotential deposition (UPD) of copper on platinum basal single crystal electrodes, especially on Pt(l II) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In these studies much emphasis has been placed on the effects of halides as well as other adsorbates on the deposition and stripping processes.…”

Induced Adsorption of Chloride and Bromide by Submonolayer Amounts of Copper Underpotentially Deposited on Pt(111)

“…However in both instances, the main peak corresponding to the stripping of copper occurs at about +0.45 V, irrespective of the anion present in solution. As mentioned earlier, the peaks at less positive potentials are believed to be due to the adsorption of anions onto the copper adlayer and recent results from UHV investigations [10] as well as in-situ surface EXAFS [22,23], indicate that this is indeed the case.…”

“…More recently [10], and using electrochemicalUHV techniques, they demonstrated that whereas the most positive voltammetric peak was due to copper deposition/stripping, the second (voltammetric feature at less positive potentials) was due to chloride adsorption/desorption. Similar results were obtained for bromide.…”