Abstract: The invention relates to the use of a ternary alloy having the formula SixTiyNiz, wherein x, y and z are natural numbers, for use in electrolysis and photoelectrolysis, in particular photo-oxidation of water. One aspect of the invention relates to a method for the manufacture of an electrode, the method comprising a step of heating a carrier comprising a surface having a layer of silicon on which a layer of TiO2 is disposed, the layer of TiO2 being covered with a layer of NiO; the heating step being carried out at a temperature above 1,000° C., and preferably between 1,150° C. and 1,250° C. The invention also relates to an electrode comprising a carrier, said electrode having either: an outer surface on which particles of a ternary alloy having the formula SixTiyNiz are positioned, wherein x, y and z are natural numbers, and wherein the particles form protrusions; or an outer surface consisting of a layer of said alloy, the layer comprising protrusions.