Cu UPD at Pt(100) and stepped faces Pt(610), Pt(410) of platinum single crystal electrodes

Abstract

The processes of adsorption/desorption of copper adatoms on the basal Pt(100) face and stepped Pt(610), Pt(410) surfaces have been studied in perchloric acid solution by cyclic voltammetry. It has been shown that the positions of the Cu stripping peaks are determined by perfection of the adlayer. The "island" model is suggested to describe electrochemical behavior of the Pt(hkl)+Cuad system. Obtained results are important for target modification of shape-controlled nanoparticles that are used in electrocatalysis.

Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals

“…As it was reported in this mini review, Cuupd is so far, one of the most studied systems on lowindex single-crystals as well as on stepped surfaces [92]. As for gold surfaces, Cuupd on platinum is The (1 1 0) plane does not show a reversible oxidation/reduction process but a quick desorption is observed.…”

“…As it was reported in this mini review, Cu upd is so far, one of the most studied systems on low-index single-crystals as well as on stepped surfaces [92]. As for gold surfaces, Cu upd on platinum is strongly dependent of the anions present in the electrolyte [17,93].…”

Deconvoluting Cyclic Voltammograms To Accurately Calculate Pt Electrochemically Active Surface Area

“…If the contributions to a cyclic voltammogram from each of these sites did not completely overlap and if the adsorption thermodynamics (of hydrogen and hydroxide onto these sites) were known, then a measured cyclic voltammogram on any Pt surface could be readily deconvoluted. However, contributions from these stepped surfaces do significantly overlap, − the thermodynamics of hydrogen and hydroxide adsorption onto all of these sites are not well understood, and it is not known whether contributions from step sites and from terrace sites on these other stepped surfaces are separable (linearly additive). This may make it impossible to fully deconvolute all contributions from all types of sites on any polycrystalline or nanoparticle platinum surface, using hydrogen/hydroxide adsorption (in the low potential region of the CV) alone.…”

Regularities of nitrate electroreduction on Pt(S)[n(100)x(110)] stepped platinum single crystals modified by copper adatoms

“…In the absence of strongly adsorbing anions [27], copper adatoms on Pt(S)-[n(100)x(110)] at first fill both the steps and the terraces. As the surface coverage increases, islands of adatoms are formed and the peak potential of their dissolution is shifted to higher positive values.…”

“…A small peak corresponding to copper phase dissolution is observed in CVs only for Pt(210) after 50 accumulation cycles. The mechanism of upd Cu formation on stepped surfaces with (100) terraces and (110) steps on Pt(610) and Pt(410) is described in more detail in [27].…”