ALKALINE PHOTOELECTROCHEMICAL CELL

摘要

The invention relates to a photoelectrochemical cell (PEC) for the light-driven production of hydrogen and oxygen from an aqueous medium in a basic environment. The invention further relates to the production of the photoelectrode of the photoelectrochemical cell and to a method for the light-driven production of hydrogen and oxygen by using the photoelectrochemical cell. The problem addressed by the invention is that of specifying a PEC that operates under alkaline conditions and therefore can forgo noble-metal catalysts, that achieves high light efficiency, and that is durable despite the alkaline conditions. This problem is solved by means of a photoelectrochemical cell, the photoelectrode of which has a special multi-layer layer structure, namely at least d) having a transparent adhesion-promoting layer, which is applied directly to the mentioned solar cell or a further solar cell and which is composed of one of the following metals or of an alloy of one or more of these metals: nickel, chromium, tungsten, hafnium; e) having a mirror layer, which is applied directly to the adhesion-promoting layer and which is composed of one of the following metals or of an alloy of one or more of these metals: silver, copper, aluminum; f) and having an anti-corrosion layer, which is applied directly to the mirror layer and adjoins the reaction chamber and is composed of nickel or of an alloy containing nickel.