Carbon Dioxide Gas Phase Reduction Apparatus and Method for Manufacturing a Porous Reducing Electrode-Supported Electrolyte Membrane

Abstract

A carbon dioxide gas-phase reduction apparatus includes: an oxidation tank including an oxidation electrode; a reduction tank which is adjacent to the oxidation tank and into which carbon dioxide is supplied when the inside of the reduction tank is empty; and a porous reduction electrode-supporting electrolyte membrane disposed between the oxidation tank and the reduction tank. The porous reduction electrode-supporting electrolyte membrane is a joint body obtained by joining a porous reduction electrode formed by dispersing a first electrolyte membrane inside voids and a second electrolyte membrane. The second electrolyte membrane is disposed on the oxidation tank side. The porous reduction electrode is disposed on the reduction tank side, connected to the oxidation electrode by a conducting wire, and performs a reduction reaction with the carbon dioxide in the reduction tank by electrons flowing through the conducting wire.

1 . A carbon dioxide gas-phase reduction apparatus comprising:
 an oxidation tank including an oxidation electrode;   a reduction tank which is adjacent to the oxidation tank and into which carbon dioxide is supplied when an inside of the reduction tank is empty; and   a porous reduction electrode-supporting electrolyte membrane disposed between the oxidation tank and the reduction tank, wherein   the porous reduction electrode-supporting electrolyte membrane is   a joint body obtained by joining a porous reduction electrode formed by dispersing a first electrolyte membrane inside voids and a second electrolyte membrane, the second electrolyte membrane is disposed on the oxidation tank side, and the porous reduction electrode is disposed on the reduction tank side, connected to the oxidation electrode by a conducting wire, and performs a reduction reaction with the carbon dioxide in the reduction tank by electrons flowing through the conducting wire.   
     
     
         2 . The carbon dioxide gas-phase reduction apparatus according to  claim 1 , wherein
 the first electrolyte membrane is formed at a void interface of the porous reduction electrode in an island shape.   
     
     
         3 . A method for manufacturing a porous reduction electrode-supporting electrolyte membrane disposed between an oxidation tank including an oxidation electrode and a reduction tank into which carbon dioxide is supplied when an inside of the reduction tank is empty, the method comprising:
 impregnating a porous reduction electrode with an electrolyte dispersion in which a polymer material constituting an electrolyte membrane is dispersed; and   superposing the porous reduction electrode impregnated with the electrolyte dispersion and an electrolyte membrane, and joining the porous reduction electrode and the electrolyte membrane by applying pressure while heating.   
     
     
         4 . The method for manufacturing a porous reduction electrode-supporting electrolyte membrane according to  claim 3 , wherein
 the electrolyte dispersion has   an electrolyte content of less than 1.0 wt. %.