Abstract: The invention pertains to a perfluorated ionic polymer. This polymer is prepared starting with polymers presenting carboxylic groupings, these groupings being transformed in reactive entities which are later eliminated.These membranes are particularly suitable for electrolysis of alkalin halogens.

Abstract: The process for the manufacture of cathodes suitable for use in electrolysis comprising depositing onto an electrically conductive substrate at least one layer of said Group VIII metal salts, one of which is a platinum group metal and then subjecting the whole to a heat treatment to oxidize said salts to the oxide form.

Abstract: A cathode especially useful in the electrolysis of aqueous solutions of alkali metal halides consisting essentially of an electrically conducting substrate and a heterogeneous coating containing a precious metal and/or a precious metal derivative; said heterogeneous coating consisting of at least two coats a and b, coat a being in contact with the substrate and containing at least one of the constituents selected from precious metals, precious metal oxides, or mixtures of precious metal oxides and at least one oxide selected from the oxides of nickel, cobalt, iron, titanium, hafnium, niobium, tantalum or zirconium, and coat b in contact with the electrolyte and with a coat a and selected from a metal of high covering power; and the process of making the cathode.

Abstract: Electrodes for electrolysis are provided comprising a valve-metal substrate and having an active surface which does not employ precious metals, said active surface comprising cobalt oxide and an oxygen or hydrogen compound of titanium in which said titanium has a valence less than 3. The electrode is particularly useful as anode in the electrolysis of sodium chloride.

Abstract: An inexpensive anode coating for an electrolytic cell, having an outstanding stability and causing only a slight over-voltage, is provided. This anode coating is deposited on a valve metal and comprises a composition of cobalt oxide and titanium bronze, having the insertion of an alkali metal. The coating anode is useful in the electrolysis of alkali halides.

Abstract: A cathode for an electrolytic cell, providing a low overvoltage on contact with the electrolyte, having at least one surface of a compound comprising (a) a metal of the group comprising nickel, copper, iron and cobalt, and (b) another element of the group comprising any of the preceding metals, titanium, lanthanides, magnesium, boron, molybdenum, manganese, vanadium, niobium and tantalum and their hydrogenation products. The cathode is particularly useful in the electrolysis of alkali chlorides.

Abstract: A novel electrode for an electrolytic cell is provided which electrode is characterized in that it comprises at least one compound of perovskite structure, of the general formula:(M.sub.1 .sub.- x M'.sub.x) Co O.sub.3wherein M is an ion of a metal from the group comprising yttrium and lanthanides, M' is an ion of a metal chosen from the group comprising ruthenium, rhenium, osmium, iridium, platinum, lead and palladium, and x is less than 1. The electrode is particularly suitable as an anode during electrolysis of alkali-metal halides.