Steady-state macroscale voltammetry in a supercritical carbon dioxide medium

Toghill, Kathryn E. and Voyame, Patrick and Momotenko, Dmitry and Olaya, Astrid J. and Girault, Hubert H. (2013) Steady-state macroscale voltammetry in a supercritical carbon dioxide medium. Physical Chemistry Chemical Physics, 15 (3). pp. 972-978. ISSN 1463-9076

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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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Journal Article
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Physical Chemistry Chemical Physics
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14 Nov 2014 10:05
Last Modified:
22 Nov 2022 01:18