1985 Volume 18 Issue 4 Pages 364-371
The relation between current density and overpotential for electroreduction of oxygen to hydrogen peroxide in the packed-bed electrode reactor was studied. Theoretical analyses were made on the basis of the two-dimensional two-phase model of the particulate electrode where the distribution of concentration of dissolved oxygen and the overpotential were considered. The kinetics of electrode reactions was determined with a rotating-disk electrode of graphite. The effective specific surface area available for electrode reaction in the packed-bed electrode was determined by analysing the transient current response to a potential step. The observed values of overpotential profile and the polarization curves of the packed-bed electrode agreed with the theoretical ones calculated by use of the kinetic and reactor properties.
