Electrode for producing chlorine through electrolysis

摘要

Electrode comprises at least an electrically conductive substrate and a catalytically active coating. The catalytically active layer is based on two catalytically active components comprising at least iridium, ruthenium or titanium as a metal oxide and/or mixed oxide. The total amount of ruthenium and/or iridium based on the sum of iridium, ruthenium and titanium is at least 10 mole-%, preferably 10-20 mol% and up to half of the ruthenium and/or iridium is replaced by vanadium or zirconium. At least one oxide base layer is applied on the electrically conducting substrate. Electrode comprises at least an electrically conductive substrate and a catalytically active coating. The catalytically active layer is based on two catalytically active components comprising at least iridium, ruthenium or titanium as a metal oxide and/or mixed oxide. The total amount of ruthenium and/or iridium based on the sum of iridium, ruthenium and titanium is at least 10 mole-%, preferably 10-20 mol% and up to half of the ruthenium and/or iridium is replced by vanadium or zirconium, preferably vanadium. At least one oxide base layer is applied on the electrically conducting substrate and the oxide base layer is impermeable for aqueous electrolytes comprising sodium chloride and/or sodium hydroxide or hydrogen chloride. Independent claims are also included for: (1) producing the electrode, comprising applying sol-gel coating solution containing a solution or dispersion of metal compounds of at least one of ruthenium, iridium or titanium on the electrically conductive substrate, preferably by immersion, removing the solvent, and calcining the dried metal compound layer at elevated temperature, preferably at least 350[deg] C, preferably at least 400[deg] C in the presence of oxygen-containing gases and optionally the steps of applying the solution or dispersion, drying and calcinating is carried out once or repeated many times; and (2) an electrolyzer for electrolyzing the electrolysis of sodium chloride or hydrogen chloride-containing solutions, comprising the electrode as an anode.