Issue 28, 2013

Superoxide generation from the reduction of oxygen at the carbon–oil–water triple phase boundary

Abstract

The reduction of oxygen is studied in aqueous solutions of pH 6.22–8.01, at a carbon paste electrode fabricated from dioctyl phthalate (oil) and graphite. Two two-electron voltammetric waves are usually seen on carbon electrodes, associated with the formation of hydrogen peroxide and water, respectively. However, an additional signal is seen on the carbon paste electrode, which can attributed to the initial formation of the superoxide radical anion, O2˙. Data is presented to show that the predominant source of oxygen for this reaction is that dissolved in the carbon paste material, rather than in the aqueous solution, and that the superoxide is likely formed at the graphite–oil–water triple phase boundary. Kinetic and thermodynamic parameters for the O2/O2˙ redox couple are reported.

Graphical abstract: Superoxide generation from the reduction of oxygen at the carbon–oil–water triple phase boundary

Article information

Article type
Paper
Submitted
23 Apr 2013
Accepted
05 Jun 2013
First published
05 Jun 2013

Phys. Chem. Chem. Phys., 2013,15, 11918-11925

Superoxide generation from the reduction of oxygen at the carbon–oil–water triple phase boundary

R. Nissim and R. G. Compton, Phys. Chem. Chem. Phys., 2013, 15, 11918 DOI: 10.1039/C3CP51732B

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