title: Steady-state macroscale voltammetry in a supercritical carbon dioxide medium.
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 CO(2) 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.
authors.affiliation: Laboratoire d'Electrochimie Physique et Analytique (LEPA), Ecole polytechnique fédérale de Lausanne (EPFL), Institut des sciences et ingénierie chimiques (ISIC), Lausanne, Switzerland.
authors.forename: Kathryn E
authors.initials: KE
authors.lastname: Toghill
authors.forename: Patrick
authors.initials: P
authors.lastname: Voyame
authors.forename: Dmitry
authors.initials: D
authors.lastname: Momotenko
authors.forename: Astrid J
authors.initials: AJ
authors.lastname: Olaya
authors.forename: Hubert H
authors.initials: HH
authors.lastname: Girault