The simultaneous voltammetric determination and detection of oxygen and carbon dioxide
| Autor: | Jay D. Wadhawan, H. McPeak, Richard G. Compton, Clive E.W. Hahn, Peter J. Welford |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Superoxide
Inorganic chemistry Metals and Alloys chemistry.chemical_element Condensed Matter Physics Electrochemistry Oxygen Amperometry Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Microelectrode chemistry Carbon dioxide Materials Chemistry Dimethylformamide Electrical and Electronic Engineering Instrumentation Electrochemical reduction of carbon dioxide |
| Zdroj: | Sensors and Actuators B: Chemical. 88:40-52 |
| ISSN: | 0925-4005 |
| Popis: | The kinetics of the reaction between superoxide and carbon dioxide are investigated at a 10 μm gold disc microelectrode in three non-aqueous solvent systems (dimethylsulphoxide, N , N -dimethylformamide and acetonitrile), and are observed to be first-order with respect to both superoxide and carbon dioxide in all three cases, with a DISP1-type pathway likely followed. Although the reaction between electrogenerated superoxide and carbon dioxide is fast (as great as 10 5 M −1 s −1 ), deconvolution of the two observed signals due to oxygen and carbon dioxide reduction is shown to be possible. Accordingly, an electrochemical sensing strategy is developed for the direct amperometric sensing of both gases in non-aqueous solutions, using a single membrane-free microelectrode immersed in a three-electrode electrochemical cell. |
| Databáze: | OpenAIRE |
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