Electrolytic cell and electrolysis device

Abstract

An electrolytic cell of the present disclosure includes a first separator, a second separator, an ion exchange membrane configured to be disposed between the first separator and the second separator, and an anion exchange membrane with hydroxide ion conductivity, a cathode configured to be disposed between the first separator and the ion exchange membrane, and an anode configured to be disposed between the second separator and the ion exchange membrane. In a case of being viewed in a first direction in which the ion exchange membrane, the cathode, and the anode overlap each other, an area of the anode is larger than an area of the cathode.

1 . An electrolytic cell comprising:
 a first separator;   a second separator;   an ion exchange membrane configured to be disposed between the first separator and the second separator, and an anion exchange membrane with hydroxide ion conductivity;   a cathode configured to be disposed between the first separator and the ion exchange membrane; and   an anode configured to be disposed between the second separator and the ion exchange membrane,   wherein in a case of being viewed in a first direction in which the ion exchange membrane, the cathode, and the anode overlap each other, an area of the anode is larger than an area of the cathode.   
     
     
         2 . The electrolytic cell according to  claim 1 ,
 wherein in the case of being viewed in the first direction, an area of the ion exchange membrane is larger than the area of the anode.   
     
     
         3 . The electrolytic cell according to  claim 1 ,
 wherein an area ratio of the anode to the cathode in the case of being viewed in the first direction is more than 1.0 and 2.0 or less.   
     
     
         4 . The electrolytic cell according to  claim 1 ,
 wherein an area ratio of the anode to the cathode in the case of being viewed in the first direction is set such that a rate of increase of an overvoltage of the anode due to progress of deterioration is less than 2 times as compared with a rate of increase of an overvoltage of the cathode.   
     
     
         5 . The electrolytic cell according to  claim 1 ,
 wherein the cathode includes a cathode catalyst layer configured to overlap the ion exchange membrane and a cathode power supply body configured to be disposed between the cathode catalyst layer and the first separator,   the anode includes an anode catalyst layer configured to overlap the ion exchange membrane and an anode power supply body configured to be disposed between the anode catalyst layer and the second separator, and   a catalyst carrying amount of the anode catalyst layer is 1 time or more as compared with a catalyst carrying amount of the cathode catalyst layer.   
     
     
         6 . The electrolytic cell according to  claim 5 ,
 wherein a volume ratio of the anode catalyst layer to the cathode catalyst layer is set such that a rate of increase of an overvoltage of the anode due to progress of deterioration is less than 2 times as compared with a rate of increase of an overvoltage of the cathode.   
     
     
         7 . An electrolytic cell comprising:
 a first separator;   a second separator;   an ion exchange membrane configured to be disposed between the first separator and the second separator;   a cathode configured to be disposed between the first separator and the ion exchange membrane; and   an anode configured to be disposed between the second separator and the ion exchange membrane,   wherein the cathode includes a cathode catalyst layer configured to overlap the ion exchange membrane and a cathode power supply body configured to be disposed between the cathode catalyst layer and the first separator,   the anode includes an anode catalyst layer configured to overlap the ion exchange membrane and an anode power supply body configured to be disposed between the anode catalyst layer and the second separator, and   a volume ratio of the anode catalyst layer to the cathode catalyst layer is set such that a rate of increase of an overvoltage of the anode due to progress of deterioration is less than 2 times as compared with a rate of increase of an overvoltage of the cathode.   
     
     
         8 . An electrolysis device comprising:
 the electrolytic cell according to  claim 1 ;   an electrolyte supply unit configured to supply an electrolyte to the electrolytic cell; and   a power supply unit configured to apply a voltage to the electrolytic cell.   
     
     
         9 . The electrolysis device according to  claim 8 , further comprising:
 an electrolytic cell stack that has a plurality of electrolytic cells having the electrolytic cell,   wherein two adjacent electrolytic cells among the plurality of electrolytic cells share the first separator or the second separator, which is a bipolar plate.