Superoxide electrochemistry in an ionic liquid

Inas M. AlNashef, Matthew L. Leonard, Michael A. Matthews, John W. Weidner

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


The superoxide ion (O2) has been generated electrochemically from oxygen dissolved in two different solvent systems: (1) acetonitrile with tetraethylammonium perchlorate (TEAP) as the supporting electrolyte at elevated pressure and (2) in a room-temperature ionic liquid, 1-n-butyl- 3-methylimidazolium hexafluorophosphate ([bmim][HFP]), at atmospheric pressure. A high-pressure electrochemical cell with a quasi reference electrode was developed for elevated pressure tests. Increasing the partial pressure of oxygen in the first system increased the rate of superoxide generation because of the increased solubility of oxygen according to Henry's law. The subsequent addition of gaseous carbon dioxide enhances the rate of oxygen reduction in both systems but inhibits the reverse (oxidation) reaction of O2 to O2. This later observation is consistent with the irreversible formation of a peroxydicarbonate ion, as has been postulated by others.

Original languageBritish English
Pages (from-to)4475-4478
Number of pages4
JournalIndustrial and Engineering Chemistry Research
Issue number18
StatePublished - 4 Sep 2002


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