塩化物および硫酸塩溶液中における鉛-白金および鉛-パラジウム複合電極の陽極的挙動

抄録

Considerable interests have been aroused in the use of Pb-Pt and Pb-Pd bielectrodes counting for expensive Pt electrodes and corrodible lead dioxide ones.
In this study anodic polarization curves of these electrodes were measured by a potentiostat. The results obtained were as follows:
In the case of the Pb electrode in NaCl solution, the anodic current density took a minimum value at 1.4V, a maximum at 1.6V and another minimum at 1.75V, then increasing in proportion to the anodic potential, while for the anodic current density in Na₂SO₄ solution an ever increasing curve was obtained with increasing anodic potential. On the other hand, with the Pb-Pt bielectrode, only one minimum was seen between 0.6 and 0.9V, while with the Pb-Pd bielectrode the behavior curve was remarkably different indicating a steeper increase of the current density at -0.23V and a passive state between 0.8 and 1.1V. The anodic current between -0.2 and 0V probably derived from dissolution of palladium and above 0V oxygen evolved.
The electronic deflection revealed no annular pattern, thus suggesting non-crystalline deposit on the electrode surface in sodium sulfate solution.
So far as we studied, the Pb-Pd bielectrode has been proved to withstand the process of electrolysis in artificial sea water.