Arrangement for the electrolysis of carbon dioxide

Abstract

An arrangement for the electrolysis of carbon dioxide, includes: an electrolytic cell having an anode and a cathode, wherein the anode and cathode are connected to a voltage supply, wherein the cathode is configured as a gas diffusion electrode to which a gas compartment is attached on a first side and a cathode compartment is attached on a second side; an electrolyte circuit connecting to the electrolytic cell; and a gas supply for supplying carbon dioxide-containing gas into the gas compartment, wherein one or more channels are arranged in the gas compartment, wherein the channels are at least partially in contact with the gas diffusion electrode and are configured for transporting electrolyte fluid passing through the gas diffusion electrode to a lateral region of the gas compartment.

1 . An arrangement for carbon dioxide electrolysis, comprising
 an electrolysis cell having an anode and a cathode, where anode and cathode are connected by a power supply, where the cathode is configured as a gas diffusion electrode adjoined on a first side by a gas space and on a second side by a cathode space,   an electrolyte circuit adjoining the electrolysis cell,   a gas feedfor supply of carbon dioxide-containing gas to the gas space, characterized in that there are one or more channels disposed in the gas space, where the channels at least partly adjoin the gas diffusion electrode and are configured for transport of electrolyte liquid penetrating through the gas diffusion electrode to a side region of the gas space.   
     
     
         2 . The arrangement as claimed in  claim 1 ,
 in which the channels have an essentially linear configuration and an oblique arrangement with an angle to the horizontal between 1° and 30°.   
     
     
         3 . The arrangement as claimed in  claim 1 ,
 in which the distance between the channels is between 3 cm and 10 cm.   
     
     
         4 . The arrangement as claimed in  claim 1 ,
 in which the channels are connected by a common support structure, where the support structure is spaced apart from the gas diffusion electrode.   
     
     
         5 . The arrangement as claimed in  claim 1 ,
 in which the support structure has one or more support pins in mechanical contact with the surface of the gas diffusion electrode.   
     
     
         6 . The arrangement as claimed in  claim 5 , in which the support pins have a diameter of less than  1  mm. 
     
     
         7 . The arrangement as claimed in  claim 1 ,
 in which at least some of the support pins have vortexing elements arranged at a distance from the surface of the gas diffusion electrode of at least 1 mm, especially at least 2 mm.   
     
     
         8 . The arrangement as claimed in  claim 7 , in which the vortexing elements have a corrugated configuration. 
     
     
         9 . The arrangement as claimed in  claim 1 ,
 in which the support structure, the support pins and/or the channels comprise a material having low hydrophobicity, for example PE.   
     
     
         10 . The arrangement as claimed in  claim 1 , having
 an electrically conductive material for contacting the gas diffusion electrode.   
     
     
         11 . The arrangement as claimed in  claim 1 ,
 in which the support structure and/or the channels comprise an electrically conductive material for contacting the gas diffusion electrode.   
     
     
         12 . The arrangement as claimed in  claim 5 ,
 in which the support pins comprise an electrically conductive material for contacting the gas diffusion electrode.