ELECTRODES ACTIVATED BY HETEROPOLYACIDS, THEIR PREPARATION AND APPLICATION, IN PARTICULAR AS CATHODES FOR THE ELECTROLYSIS OF WATER IN AN ACIDIC MEDIUM

摘要

1. Electrode consisting of electrically conductive material, activated by treatment with a heteropolyacid, characterized in that it can be obtained by a process consisting in placing an electrode made of conductive material in contact with a dilute aqueous solution of at least one heteropolyacid which has a concentration below 10**-3 M in acidic medium, and in then applying to the electrode a cathode voltage of at least -0.4 volts, relative to a saturated calomel electrode, for a sufficient time for the current to be stabilized, which corresponds to the fact that the reduction waves of the corresponding heteropolyanion can no longer be observed in cyclic voltammetry.