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Silver ion deposition on gold and silver disc electrodes from aqueous solutions and from dry or wet [EMIM][NTf2] room-temperature ionic liquid

Abstract : Silver ion deposition on gold and silver disc electrodes in nitrate aqueous solutions and in [EMIM][NTf 2 ] room-temperature ionic liquid were investigated by staircase voltammetry (SV) and square wave voltammetry (SWV). The kinetics of the Ag(I)/Ag couple in [EMIM][NTf 2 ] solutions prepared with AgNTf 2 depends both on their water content and the AgNTf 2 concentration. The electrochemical reaction is reversible in aqueous solutions and wet [EMIM][NTf 2 ] long exposed to the open air, while it is quasi-reversible in anhydrous [EMIM][NTf 2 ]. Silver ion deposition proceeds without 3D nucleation overvoltage only in acidic aqueous solutions and anhydrous [EMIM][NTf 2 ]. It is shown in particular that back-and-forth scans in SWV allow direct detection of relatively low nucleation overvoltage occurring in 1 M KNO 3 solution. The role of the metal-water interface was discussed, kinetic parameters for 0.1 M AgNTf 2 in anhydrous [EMIM][NTf 2 ] were determined by numerical simulation and theoretical conclusions on SV for metal ion deposition from high-resistive media previously published were checked.
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Submitted on : Wednesday, May 11, 2016 - 3:20:51 PM
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Dongya Liu, Denise Krulic, Henri Groult, Nicolas Fatouros. Silver ion deposition on gold and silver disc electrodes from aqueous solutions and from dry or wet [EMIM][NTf2] room-temperature ionic liquid. Journal of Electroanalytical Chemistry, Elsevier 2016, 775, pp.91-104. ⟨10.1016/j.jelechem.2016.05.004⟩. ⟨hal-01314528⟩

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