Electrode for electrolysis, electrolytic process using the electrode, and electrolytic apparatus using them

Abstract

An object of the present invention is to provide an electrode for electrolysis which is available by an easy fabrication process, can produce ozone water at high efficiency and also can produce hydrogen peroxide and OH radicals having a high oxidizing power by the electrolysis of water at a low current density; an electrolytic process using the electrode; and an electrolytic apparatus using them. The electrode for electrolysis according to the present invention has a substrate and a surface layer formed on the surface thereof, the surface layer being made of anatase type titanium oxide.

1 . An electrode for electrolysis comprising a substrate and a surface layer formed on the surface thereof, wherein the surface layer is anatase type titanium oxide.  
     
     
         2 . An electrode for electrolysis according to  claim 1 , wherein the surface layer has a thickness not greater than 1 mm.  
     
     
         3 . An electrode for electrolysis according to  claim 1  or  2 , wherein the surface layer has a thickness from 200 nm to 600 nm.  
     
     
         4 . An electrode for electrolysis according to any one of  claims 1  to  3 , wherein the substrate is conductive at least a contact surface thereof with the surface layer.  
     
     
         5 . An electrolytic process, which comprises electrolyzing water or an electrolyte solution at a current density from 0.1 mA/cm 2  to 2000 mA/cm 2  while using an electrode for electrolysis as claimed in any one of  claims 1  to  4  as an anode.  
     
     
         6 . An electrolytic process according to  claim 5 , wherein the substance produced by the electrolytic process is at least one of ozone, hydrogen peroxide and another active oxygen species.  
     
     
         7 . An electrolytic apparatus, which comprises an electrode for electrolysis as claimed in any one of  claims 1  to  4  and electrolyzes water or an electrolyte solution by using the electrode in accordance with an electrolytic process as claimed in  claim 5  or  6 .