Abstract
The PbO 2 and F −-doped PbO 2 (F-PbO 2) film electrodes have been prepared by an electrodeposition process onto platinum substrate. The changes of their electrochemical activity for oxygen evolution (OE) reaction with accelerated electrolysis time have been studied. The results show that the activity of the electrodes decreases with increasing electrolysis time. This can be attributed to the conductivity variations, which are caused by the decrease of the oxygen vacancy concentration in PbO 2 films during OE. The mechanism of the decrease of the oxygen vacancies has been investigated. For F-PbO 2 film electrodes, though its electrochemical activity is somewhat lower than that of undoped one, its activity stability is much higher in comparison with that of PbO 2. The influence of F − doping on the activity of PbO 2 film electrodes has been also discussed.
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