Voltammetric studies of gold, protons, and [HCl2]- in ionic liquids
Journal
Journal of Physical Chemistry C
Journal Volume
111
Journal Issue
24
Start Page
8496
End Page
8503
ISSN
19327455
Date Issued
2007
Author(s)
Silvester, Debbie S.
Pitner, William R.
Compton, Richard G.
Lagunas, M. Cristina
Hardacre, Christopher
Abstract
The comparative study of the voltammetry of H[NTf2], HCl and H[AuCl4] in [C4mim][NTf2] has provided an insight into the influence of protons on the reduction of [AuCl 4]- at Au, Pt or glassy carbon (GC) electrodes, and has allowed the identification of an unprecedented proton-induced electroless deposition of Au on relatively inert GC surfaces. For the first time, clear evidence of the quantitative formation of [HCl2]- has been obtained in HCl/[C4mim] [NTf2] mixtures, and the electrochemical behavior of these mixtures analyzed. In particular, a significant shift of the dissociation equilibrium toward the formation of chloride and the solvated proton (HIL+), following electrochemical reduction of HIL+ has been observed in the time-scale of the experiments. © 2007 American Chemical Society.
Type
journal article