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Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

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<mark>Journal publication date</mark>2013
<mark>Journal</mark>Physical Chemistry Chemical Physics
Issue number3
Volume15
Number of pages7
Pages (from-to)972-978
Publication StatusPublished
<mark>Original language</mark>English

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.