One-unit photo-activated electrolyzer

A photo-activated semiconductor device is adapted to be exposed to light energy. Two physically separated electrocatalysts are placed in electrical contact with the photo-activated semiconductor device. An electrolytic solution physically separated from the semiconductor device is placed in electrical contact with both electrocatalysts. A method for supplying electrical energy to an anode and a cathode is an electrochemical reaction zone containing an electrolytic solution which comprises positioning a photo-activated semiconductor device having separate donor and acceptor regions external to an electrolytic solution. The doner region is electrically connected to a cathode and the acceptor region is electrically connected to the anode. A portion of the photo-activated semiconductor device is exposed to a source of radiation which is external to the reaction zone. The products derived from the electrolytic solution are collected for later use.U