Cathode, method for manufacturing cathode, and electrolyzer

Abstract

Provided is a cathode for use in electrolytic reduction of carbon dioxide and/or carbon monoxide, comprising a gas diffusion layer, a first layer containing nanodiamonds, and a second layer containing a catalyst that promotes electrolytic reduction of the carbon dioxide and/or carbon monoxide.

What is claimed is: 
     
         1 . A cathode for use in electrolytic reduction of carbon dioxide and/or carbon monoxide, comprising:
 a gas diffusion layer;   a first layer containing nanodiamonds; and   a second layer containing a catalyst that promotes electrolytic reduction of the carbon dioxide and/or carbon monoxide.   
     
     
         2 . The cathode according to  claim 1 , wherein the nanodiamonds are hydrogen-terminated. 
     
     
         3 . The cathode according to  claim 1 , wherein a weight of the first layer per unit geometric area of the gas diffusion layer is 0.005 mg/cm 2  or more and 10 mg/cm 2  or less. 
     
     
         4 . The cathode according to  claim 1 , further comprising a third layer containing a fluororesin. 
     
     
         5 . The cathode according to  claim 1 , wherein the first layer further contains a fluororesin. 
     
     
         6 . A method for manufacturing a cathode for use in electrolytic reduction of carbon dioxide and/or carbon monoxide, comprising:
 applying a dispersion containing nanodiamonds on a gas diffusion layer to form a first layer; and   sputtering a catalyst that promotes electrolytic reduction of the carbon dioxide and/or carbon monoxide on the gas diffusion layer to form a second layer.   
     
     
         7 . The method for manufacturing a cathode according to  claim 6 , further comprising applying a dispersion containing a fluororesin on the gas diffusion layer to form a third layer. 
     
     
         8 . The method for manufacturing a cathode according to  claim 6 , wherein the dispersion further contains a fluororesin. 
     
     
         9 . An electrolyzer comprising the cathode according to  claim 1 .