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Phys Chem Chem Phys. 2013 Jan 21;15(3):972-8. doi: 10.1039/c2cp42856c.

Steady-state macroscale voltammetry in a supercritical carbon dioxide medium.

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Laboratoire d'Electrochimie Physique et Analytique (LEPA), Ecole polytechnique fédérale de Lausanne (EPFL), Institut des sciences et ingénierie chimiques (ISIC), Lausanne, Switzerland.


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.

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