Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

Kathryn E. Toghill; Patrick Voyame; Dmitry Momotenko; Astrid J. Olaya; Hubert H. Girault

doi:10.1039/C2CP42856C

Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

Kathryn E. Toghill,*^a Patrick Voyame,^a Dmitry Momotenko,^a Astrid J. Olaya^a and Hubert H. Girault*^a

* Corresponding authors

^a Laboratoire d'Electrochimie Physique et Analytique (LEPA), Ecole polytechnique fédérale de Lausanne (EPFL), Institut des sciences et ingénierie chimiques (ISIC), Lausanne, Switzerland
E-mail: hubert.girault@epfl.ch
Fax: +41 (0)21 693 36 67
Tel: +41 (0)21 693 31 51

Abstract

The electrochemical oxidation and reduction of decamethylferrocene is demonstrated in supercritical carbon dioxide at a macro gold disc electrode at 100 bar and 313 K. Fast mass transport effects were exhibited and the corresponding steady-state voltammetry was observed at high scan rates. A highly lipophilic room temperature ionic liquid that readily dissolved in supercritical CO₂ with acetonitrile as a co-solvent was used as an electrolyte, allowing for a conducting supercritical single phase. Experimental observations along with simulation results confirmed the hypothesis that a thin layer of liquid-like phase of co-solvent is formed at the electrode surface and is restricted by a more supercritical phase of high natural convection and bulk concentration.

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Publication details

The article was received on 15 Aug 2012, accepted on 24 Oct 2012 and first published on 25 Oct 2012

Article type: Paper

DOI: 10.1039/C2CP42856C

Citation: Phys. Chem. Chem. Phys., 2013,15, 972-978

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Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

K. E. Toghill, P. Voyame, D. Momotenko, A. J. Olaya and H. H. Girault, Phys. Chem. Chem. Phys., 2013, 15, 972
DOI: 10.1039/C2CP42856C
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Physical Chemistry Chemical Physics

Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

Abstract

Supplementary files

Publication details

Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

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