PURPOSE: To provide a titled cathode which can maintain a low hydrogen overvoltage characteristic for a long period of time, by the constitution wherein the parts of a high hydrogen overvoltage are dispersed on the electrolytic surface placed oppositely to an anode and the deterioration of an active cathode owing to the impurities in the catholyte is prevented.
CONSTITUTION: A material of a low hydrogen overvoltage such as metals of Pt groups, Ni, Co, Cu, Ag, etc., or their alloys, compds., etc. is installed by spraying or the like on an electrode base material of iron or the like, whereby an active cathode is obtd. Materials of a high hydrogen overvoltage such as metals or various compds. of Ni, Ti, Ag, etc. are adhered here and there by spraying or the like on the side of the active cathode facing oppositely to the anode. The parts of the high hydrogen overvoltage are provided preferably at about ≤50% of the entire surface of the cathode, and the size of the spot is made preferably about ≤20mm and the distribution thereof approximately uniform. The impurities in the catholyte deposit as acicular crystals in these parts of the high hydrogen overvoltage, whereby the activity of the cathode is maintained for a long period of time.