ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Influence of pretreatment of active carbon on the properties of porous carbon electrodes for preparing hydrogen peroxide by cathodic reduction of oxygen
J. Balej, K. Balogh, and O. Špalek
Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences,
160 00 Prague
Abstract: Preparation of hydrogen peroxide by cathodic reduction of oxygen in porous
electrodes from active carbons without or with a thermal pretreatment at min. 1000°C
either in vacuo or in the presence of alkali sulfides in an inert atmosphere at normal
pressure was investigated. The current yields of hydrogen peroxide on electrodes from
untreated active carbons are initially very low and rise slowly with time up to ca.
15—25%. The thermal pretreatment of active carbon in vacuo results in a pronounced
increase of current yields up to 60—80% (at 30 mA cm2); from this value they begin to
decrease and after several hours they reach the level equal to that for untreated carbon.
The most effective treatment consists in heating active carbon in an inert atmosphere
with alkali metal sulfides; for this treatment the optimum temperature and time of
heating were found. The lifetime of such electrodes reaches in best cases about one
thousand hours. A continual feeding of the inlet electrolyte with catalytic poisons (HgO,
As2O3) has no effect on current yields of hydrogen peroxide when using electrodes from
untreated active carbon.
Full paper in Portable Document Format: 305a611.pdf
Chemical Papers 30 (5) 611–620 (1976)