Mixed solutions of silver cation and chloride anion in acetonitrile: Voltammetric and EQCM study

Abstract

Electrochemical behavior of Pt and Au electrodes in acetonitrile solutions at different concentration ratios of Cl(-) and Ag(+) ions was studied by cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The composition of the mixed silver chloride solutions, i.e. the amount of each component of the system (solid AgCl and solute species: Ag(+), Cl(-), AgCl(2)(-)), is governed by the solubility product of AgCl and the stability constant of AgCl(2)(-)complex and depends strongly on the ratio of the total concentrations of chloride and silver ions. In this work we analyze in detail the influence of the Cl(-)/Ag(+) concentration ratio on the value of equilibrium electrode potential and the shape of cyclic voltammograms. We explain the complicated shapes of the experimental curves observed at different concentration ranges, propose the mechanisms of the processes occurring at the electrode and substantiate them by EQCM data.

Noble-Metal Nanorod Cryoaerogels with Electrocatalytically Active Surface Sites

“…These species can be reduced to Ag 0 during the cathodic scan. Peak III can be attributed to the reduction of AgCl to Ag, while peak IVbeing more prominent with an increasing number of cyclesindicates the reduction of AgCl 2 – complex back to Ag 0 …”

Surface Changes at Platinized Platinum Based Hydrogen Gas Electrodes Following Use in Highly Saline Aqueous Solutions

“…High concentration of chloride ions in solution promotes enhanced solubility of the AgCl ( K sp AgCl=1.8×10 −10 , at 25 °C) surface layer of the Ag, AgCl electrode, through the formation of chloro‐complex ions, AgCl 2 − , AgCl 3 2− and AgCl 4 3− 7, 8, 9 , , , …”

A new strategy towards electroactive polymer–inorganic nanostructure composites. Silver nanoparticles inside polypyrrole matrix with pendant titanocene dichloride complexes

“…Our previous publication [59] demonstrated a candidate for such a precursor: complex anion of silver and chloride, AgCl À 2 , which is nicely soluble in AN. It is formed if the overall amount of chloride in the system exceeds that of silver cation, practically all silver in the solution being transformed into this anionic form if the ratio of chloride-to-silver exceeds 2.12 [59]:…”

“…It is formed if the overall amount of chloride in the system exceeds that of silver cation, practically all silver in the solution being transformed into this anionic form if the ratio of chloride-to-silver exceeds 2.12 [59]:…”

“…1 mM AgNO 3 + x mM TEACl, was calculated on the basis of thermodynamic constants for this system, see e.g. Table 2 and Fig 1 in [59]. For example, this potential is equal to À0.73 V for the 2 mM M Ag + + 100 mM TEACl solution used for silver deposition.…”