Affiliation:
1. Centro di studio su Fotoreattività e Catalisi (CNR) - Dipartimento di Chimica (Università di Ferrara), Ferrara, Italy
2. Department of Physical Chemistry, Ukrainian State Chemical Technology University, Dnepropetrovsk, Ukraine
Abstract
Doping of PbO2 by cations (Fe3+, Co2+ and Ni2+), by F- and by cations and F-
simultaneously is discussed as a way of improving the stability and
electrochemical activity in processes occurring at high potentials. Doping
allows the control of the amount of structural water in an oxide. Radiotracer
experiments showed that high electrodeposition current densities favour the
segregation of incorporated tritium (protons) at the surface. On the other
hand, fluorine doping results in a marked decrease in the amount of surface
oxygen species. The influence of doping with metal cations strongly depends
on the nature of the metal. Iron behaves like fluorine, while nickel causes
an accumulation of surface oxygen species. Doped PbO2 electrodes have quite
good activities for the electrogeneration of ozone. In particular, Fe and Co
doped PbO2 showed a current efficiency of 15-20%for this process. This result
is relevant to our recent studies on ?cathodic oxidation?, i.e., an ozone
mediated electrochemical method in which an O2 stream is used to sweep
theO2/O3 gas mixture produced at a PbO2 anode into the cathodic compartment
of the same electrochemical cell containing polluting species.
Publisher
National Library of Serbia
Cited by
23 articles.
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