Ethylene-selective electrode with a mixed valence cu4o3 catalyst

Abstract

An electrode including Cu4O3, in particular an ethylene-selective electrode with a mixed valence Cu4O3 catalyst. A method for producing an electrode of this type, an electrolytic cell having an electrode of this type, and a method for electrochemically converting carbon dioxide using such an electrode including Cu4O3.

1 . An electrode, comprising:
 Cu 4 O 3 .   
     
     
         2 . The electrode as claimed in  claim 1 ,
 wherein the Cu 4 O 3  is present in an amount of 0.1-100% by weight based on the electrode.   
     
     
         3 . The electrode as claimed in  claim 1 ,
 wherein the Cu 4 O 3  has been applied to a support.   
     
     
         4 . The electrode as claimed in  claim 3 ,
 wherein the Cu 4 O 3  has been applied with a mass coverage of at least 0.5 mg/cm 2 .   
     
     
         5 . The electrode as claimed in  claim 1 ,
 wherein the electrode is a gas diffusion electrode.   
     
     
         6 . An electrolysis cell, comprising:
 an electrode as claimed in  claim 1 .   
     
     
         7 . A process for producing an electrode comprising Cu 4 O 3  on a substrate, the process comprising:
 preparing a mixture comprising Cu 4 O 3  and optionally at least one binder, or providing a powder consisting of Cu 4 O 3 ,   applying the mixture comprising Cu 4 O 3  or the powder consisting of Cu 4 O 3  to a support, preferably in the form of a sheetlike structure, and   dry rolling the mixture comprising Cu 4 O 3  or the powder consisting of Cu 4 O 3  onto the support.   
     
     
         8 . The process as claimed in  claim 7 ,
 wherein the preparing of the mixture comprises mixing for 60-200 s.   
     
     
         9 . The process as claimed in  claim 7 ,
 wherein the rolling application is effected at a temperature of 25-100° C.   
     
     
         10 . A process for producing an electrode comprising Cu 4 O 3  on a substrate, the process comprising:
 providing a support,   applying a suspension comprising Cu 4 O 3  and optionally at least one binder to the support, and   drying the suspension; or   providing a support, and   applying Cu 4 O 3  or a mixture comprising Cu 4 O 3  from the gas phase.   
     
     
         11 . The process as claimed in  claim 10 ,
 wherein the support is a gas diffusion electrode or gas diffusion layer.   
     
     
         12 . The process as claimed in  claim 7 ,
 wherein the at least one binder is present in the mixture.   
     
     
         13 . The process as claimed in  claim 12 ,
 wherein the at least one binder is present in the mixture in an amount of >0 to 30% by weight, based on the total weight of Cu 4 O 3  and the at least one binder.   
     
     
         14 . A process for producing the electrode of  claim 1 , the process comprising:
 producing a powder comprising Cu 4 O 3 ; and   rolling the powder out to give an electrode.   
     
     
         15 . A process for electrochemical conversion of carbon dioxide and/or carbon monoxide, the process comprising:
 introducing carbon dioxide and/or carbon monoxide at the cathode into an electrolysis cell comprising an electrode as claimed in  claim 1  as cathode and reduced.   
     
     
         16 . A process for reduction of CO 2  and/or CO, comprising:
 using the electrode of  claim 1 .   
     
     
         17 . A process for the electrolysis of CO 2  and/or CO, comprising:
 using the electrode of  claim 1 .   
     
     
         18 . The electrode as claimed in  claim 2 ,
 wherein the Cu 4 O 3  is present in an amount of 40-100% by weight based on the electrode.   
     
     
         19 . The electrode as claimed in  claim 2 ,
 wherein the Cu 4 O 3  is present in an amount of 70-100% by weight based on the electrode.   
     
     
         20 . The process as claimed in  claim 9 ,
 wherein the rolling application is effected at a temperature of 60-80° C.