Voltammetric studies of gold, protons, and [HCl2](-) in ionic liquids

Leigh Aldous; D.S. Silvester; W.R. Pitner; R.G. Compton; M.C. Lagunas; Christopher Hardacre

doi:10.1021/jp0709555

Voltammetric studies of gold, protons, and [HCl2](-) in ionic liquids

Leigh Aldous, D.S. Silvester, W.R. Pitner, R.G. Compton, M.C. Lagunas, Christopher Hardacre

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article

55 Citations (Scopus)

Abstract

The comparative study of the voltammetry of H[NTf2], HCl and H[AuCl4] in [C(4)mim][NTf2] has provided an insight into the influence of protons on the reduction of [AuCl4](-) 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/[C(4)mim][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 (H-IL(+)), following electrochemical reduction of H-IL(+) has been observed in the time-scale of the experiments.

Original language	English
Pages (from-to)	8496-8503
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	111 (24)
Issue number	24
DOIs	https://doi.org/10.1021/jp0709555
Publication status	Published - 21 May 2007

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Energy(all)
Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films

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10.1021/jp0709555

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Aldous, L., Silvester, D. S., Pitner, W. R., Compton, R. G., Lagunas, M. C., & Hardacre, C. (2007). Voltammetric studies of gold, protons, and [HCl2](-) in ionic liquids. Journal of Physical Chemistry C, 111 (24)(24), 8496-8503. https://doi.org/10.1021/jp0709555

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abstract = "The comparative study of the voltammetry of H[NTf2], HCl and H[AuCl4] in [C(4)mim][NTf2] has provided an insight into the influence of protons on the reduction of [AuCl4](-) 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/[C(4)mim][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 (H-IL(+)), following electrochemical reduction of H-IL(+) has been observed in the time-scale of the experiments.",

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