Nickel adsorption on a platinized platinum electrode

Nickel-underpotential deposition on Pt(110) in sulphate-containing media

“…Neither our results on Pt(poly) nor those from the literature [3,4] should provide any lead whether nickel-UPD is possible on Pt(1 1 1). In consequence, we have checked the possibility for nickel-UPD on Pt(1 1 1).…”

“…Ni-UPD in 0.1 M H 2 SO 4 As Fig. 1(a) shows, an anodic peak (labelled peak 2) appears at À0.205 V/SCE in the presence of 10 À3 M nickel sulphate on the voltammogram for a Pt(1 1 0) electrode in 0.1 M sulphuric acid (bold black).…”

“…El-Shafei [3], Franaszczuck and Sobkowski [4], Bojkov et al [5], Kania and Holze [6] and more recently Obradovic et al [7] have reported nickel-underpotential deposition on polycrystalline platinum, but no literature exists for such phenomenon on platinum single crystals so far. In this study, the possibility of nickel-UPD was evaluated for various platinum surfaces: polycrystalline platinum, noted as Pt(poly) and well-defined platinum surfaces in the orientation (1 1 1) and (1 1 0), noted as Pt(1 1 1) and Pt(1 1 0), respectively.…”

Understanding CO-stripping mechanism from NiUPD/Pt(110) in view of the measured nickel formal partial charge number upon underpotential deposition on platinum surfaces in sulphate media

“…Whereas El-Shafei found ι Ni = 2 [2], Franaszczuck and Sobkowski measured: ι Ni = 1 [3], both paper dealing with polycrystalline platinum electrodes. The nickel formal partial charge number values we measured from EQCM and electrochemistry for Ni-UPD onto Pt(poly) in sulphate media are close, which validates both techniques.…”

“…We recently published [1] that nickel-underpotential deposition (UPD) on platinum, already monitored for bulk polycrystalline platinum [2][3][4][5][6], is favoured for the Pt(1 1 0) orientation, which in electrolytic medium is reconstructed into Pt(1 1 0)-(1 × 2) [1,7]. As nickel adsorption/desorption occurs * Corresponding author.…”