The Under Potential Deposition of Cu on Au (111) in Nonaqueous Acetonitrile

Abstract

The underpotential deposition (UPD) of Copper on Au(111) in nonaqueous acetonitrile/perchlorate electrolyte has been investigated. The deposition mechanism is thereby strongly influenced by coadsorbed acetonitrile molecules and the stability of the solvation shell around the Cu(I) ions. The UPD mechanism obeys a two step mechanism even in presence of only none specifically adsorbing perchlorate ions. Thereby the first sub monolayer of copper is stabilized by coadsorbed acetonitrile molecules. However already 5% vol water content changes the structure within the double layer and consequently degrades the copper sub monolayer. At about 20% vol water content the Cu(I) ion/solvent complex is still stable. The reduction of Cu(I) ions from this complex is much faster compared to the reduction from the respective Cu(II) water complex.

Effect of Mn and Cu Addition on Lithiation and SEI Formation on Model Anode Electrodes

“…Cu is known to form a UPD layer on Au in aqueous 28 and non-aqueous solutions. 29 As with the addition of Mn 2+ to the electrolyte, when one equivalent monolayer of Cu 2+ was added to the electrolyte initially, Figure 6b shows similar lithiation and delithiation potentials as that without Cu 2+ addition, however the capacity is substantially lower. When one equivalent monolayer of Cu 2+ is added after the first cycle, Figure 6c is obtained.…”

A facile electrochemical route to the preparation of uniform and monoatomic copper shells for gold nanoparticles

“…This journal is © the Owner Societies 2015 Au(111) 31 and Pt(111). 32 In both cases the stabilization of the upd layer through adsorbed solvent molecules was proposed.…”

“…This shows clearly that the Cu signal is localized at the extreme edge of the particle, on the outmost atomic layers. 25 Au(111) 31 and Pt(111). 32 In both cases the stabilization of the upd layer through adsorbed solvent molecules was proposed.…”

Electrochemically Enabled Chan–Lam Couplings of Aryl Boronic Acids and Anilines

“…10 In order to probe the redox behavior of the reaction mixture CV was performed (see the SI for full discussion and spectra). We observed a quasi-reversible deposition (E 1/2 red = −0.35 V vs Ag/AgCl) of an impure Cu 0 /perchlorate film on the electrode surface 21 but no direct oxidation of the soluble Cu I . Using this finding, we propose the electrochemical refining mechanism shown in Figure 1, where the less stable Cu I generated during the reaction is plated to the cathode, diminishing side product formation.…”