Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Steady-state macroscale voltammetry in a supercritical carbon dioxide medium
AU - Toghill, Kathryn E.
AU - Voyame, Patrick
AU - Momotenko, Dmitry
AU - Olaya, Astrid J.
AU - Girault, Hubert H.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - IONIC LIQUID
KW - CO2
KW - WATER
KW - MICROELECTRODES
KW - CONDUCTIVITY
KW - TEMPERATURE
KW - ELECTRODES
KW - SOLUBILITY
KW - FERROCENE
KW - STEADY-STATE
KW - SUPERCRITICAL CARBON-DIOXIDE
KW - HIGH PRESSURE
U2 - 10.1039/c2cp42856c
DO - 10.1039/c2cp42856c
M3 - Journal article
VL - 15
SP - 972
EP - 978
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 3
ER -