Electrodes for electrolysis in (in)organic chemistry - using titanium carrier for metal mixt. coated with a noble metal

摘要

Electrodes, esp. anodes, are made for electrolytic processes in (in)organic chemistry, where the electrode has a core (a) of material, e.g. Ti, which resists attack by the electrolyte. The core (a) is covered by a base layer (b) which is a mixt. of W, Ta, and Fe or the cpds. of these elements e.g. with boron or carbon; and then by a dopant layer (c) of noble metal, e.g. Rh; coatings (b,c) are applied in vacuo. Layers (b,c) are pref. applied by (1) vapour deposition; (2) ion plating; or (3) cathodic sputtering; in method (1) a vacuum harder than 10-5 torr, esp. 1-10 x 10-2 torr in a noble gas, is used, while for method (2) 1-10 x 10-2 torr in noble gas is used. Layer (b) is pref. 1-20 mu m thick, and layer (c) 0.02-1 mu m thick. The presence of oxides between materials (a,b) or (b,c) is eliminated, so the electrodes have a longer working life.