Abstract
The electrochemical behaviour of Nb and Ta electrodes in H 2SO 4 and HClO 4 acids as well as in NaOH alkaline solutions has been studied. The current-voltage curves show that these metals undergo immediate passivation in acid medium. Whereas, in alcaline solutions, the oxydation rate is extremely slow; so, it is possible to reach potentials positive enough to let electrocrystallization of PbO 2 take place, which is in contradiction with the thermodynamic previsions derived from Pourbaix diagrams. These properties lead to the preparation of Nb or Ta electrodes, coated with an electronic conducting oxide, which can be used as positive electrodes in H 2SO 4 solutions.
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