An electrolyzer has an educt chamber, a membrane, a cathode-side product chamber, a porous cathode, a diaphragm, a porous anode, in which case a liquid electrolyte can be fixed in the pores of the anode and the cathode, and an anode-side product chamber. Between the membrane and the cathode-side product chamber, a first electrically conductive plate and, adjacent to the anode-side product gas chamber, a second electrically conductive plate, are situated. The two conductive plates are used for the current supply to and the current removal from the electrodes.