Search

Detecting oxygen at the high concentration limit needs innovation. Room temperature ionic liquid trihexyl(tetradecyl)phosphonium trifluorotris(pentafluoroethyl) phosphate [P6,6,6,14][FAP] was tested as a solvent for oxygen detection through the electrochemical reduction of oxygen. Cyclic voltammetry of oxygen in nitrogen or carbon dioxide mixtures at different partial pressures was studied. The steady state current was shown to be linearly dependent on the oxygen partial pressure in high oxygen content (>77%) systems. Simultaneous detecting of oxygen and carbon dioxide is also realised in an oxygen/carbon dioxide mixture, providing proof-of-concept of high concentration oxygen and carbon dioxide dual sensing. [ABSTRACT FROM AUTHOR]

A simple method is introduced which enables the simultaneous determination of both the maximum CO2 concentration and kinetics of CO2 uptake and release by a room temperature ionic liquid. This method is based upon the analysis of chronoamperometry recorded in bulk ionic liquid at intervals during exposure to CO2 and subsequent exposure to vacuum to remove the dissolved CO2. Comparing experimental data with a numerical model reveals the rate-limiting factors for both uptake and release of CO2. [ABSTRACT FROM AUTHOR]