Porous catalyst with controlled electric field for electrochemical chlorine generation reaction in extremely low salt condition, and porous catalyst electrode using same

Abstract

The present invention relates to a novel catalyst for electrochemical chlorine generation in an extremely low salt condition and a catalyst electrode using same. In particular, the porous catalyst of the present invention has a structure in which a platinum-group metal catalyst is supported on a porous support containing a conductive metal oxide, and thus have excellent chlorine generation efficiency, specifically in an extremely low salt condition of less than 1 mM.

What is claimed is: 
     
         1 . A porous catalyst for a chlorine generation reaction under an extremely low salt condition smaller than 1 mM,
 wherein the porous catalyst has a structure in which a platinum-group metal catalyst is supported on a porous support including a conductive metal oxide.   
     
     
         2 . The porous catalyst of  claim 1 , wherein the conductive metal oxide includes tin oxide, niobium oxide, or a mixture thereof. 
     
     
         3 . The porous catalyst of  claim 1 , wherein the platinum-group metal catalyst includes platinum, iridium, or a mixture thereof. 
     
     
         4 . The porous catalyst of  claim 1 , wherein the platinum-group metal catalyst is contained in an amount of 0.3 atomic % or smaller based on 100 atomic % of the porous catalyst. 
     
     
         5 . The porous catalyst of  claim 1 , wherein the porous catalyst is represented by a following Chemical Formula 1: 
       
         
           
           
               
               
           
         
         where a and b satisfy 0≤a≤0.3, 0≤b≤0.3, and 0<a+b≤0.3, 0.7≤c+d+e≤0.95, and f is 2. 
       
     
     
         6 . A porous catalyst electrode for a chlorine generation reaction under an extremely low salt condition smaller than 1 mM, the porous catalyst electrode comprising:
 an electrode base; and   a porous catalyst coating layer formed on at least a portion of an upper surface of the electrode base,   wherein the porous catalyst coating layer has a structure in which a metal catalyst including at least one of platinum and iridium is supported on a porous support including a conductive metal oxide.   
     
     
         7 . The porous catalyst electrode of  claim 6 , wherein the electrode base includes titanium or a titanium alloy. 
     
     
         8 . The porous catalyst electrode of  claim 6 , wherein the porous catalyst electrode further comprises an intermediate oxide layer disposed between the electrode base and the porous catalyst coating layer. 
     
     
         9 . The porous catalyst electrode of  claim 8 , wherein the intermediate oxide layer includes titanium oxide or titanium alloy oxide. 
     
     
         10 . The porous catalyst electrode of  claim 6 , wherein the conductive metal oxide includes tin oxide, niobium oxide, or a mixture thereof. 
     
     
         11 . The porous catalyst electrode of  claim 6 , wherein the platinum-group metal catalyst includes platinum, iridium, or a mixture thereof. 
     
     
         12 . The porous catalyst electrode of  claim 6 , wherein the platinum-group metal catalyst is contained in an amount of 0.3 atomic % or smaller based on 100 atomic % of the porous catalyst. 
     
     
         13 . The porous catalyst electrode of  claim 6 , wherein the porous catalyst is represented by a following Chemical Formula 1: 
       
         
           
           
               
               
           
         
         where a and b satisfy 0≤a≤0.3, 0≤b≤0.3, and 0<a+b≤0.3, 0.7≤c+d+e≤0.95, and f is 2.