Electrolysis electrode

Abstract

An electrolysis electrode includes a conductive substrate, a catalyst layer and a tantalum oxide layer. The conductive substrate includes at least titanium. The catalyst layer is provided on the conductive substrate. The catalyst layer includes platinum and iridium oxide. The tantalum oxide layer is provided on the catalyst layer. In the electrolysis electrode, the catalyst layer is partially exposed.

Amendments in the claims: 
     
         1 . An electrolysis electrode, comprising:
 a conductive substrate including at least titanium;   a catalyst layer provided on the conductive substrate and including platinum and iridium oxide; and   a tantalum oxide layer provided on the catalyst layer,   the catalyst layer being partially exposed.   
     
     
         2 . The electrolysis electrode of  claim 1 , wherein
 the catalyst layer is a porous layer including
 a plurality of composite particles each including platinum and iridium oxide and 
 a plurality of pores, and 
   the electrolysis electrode further includes tantalum oxide provided in at least one pore of the plurality of pores, the tantalum oxide being in contact with the catalyst layer.   
     
     
         3 . The electrolysis electrode of  claim 1 , wherein
 the catalyst layer has a plurality of recesses recessed from a principal surface on an opposite side of the catalyst layer from the conductive substrate,   the tantalum oxide layer has
 a first portion provided on the principal surface in the catalyst layer and 
 a second portion provided on an inner surface of at least one recess of the plurality of recesses in the catalyst layer. 
   
     
     
         4 . The electrolysis electrode of  claim 3 , wherein
 the catalyst layer is partially exposed in the plurality of recesses.   
     
     
         5 . The electrolysis electrode of  claim 1 , further comprising
 an intermediate layer provided between the conductive substrate and the catalyst layer, the intermediate layer including platinum.   
     
     
         6 . The electrolysis electrode of  claim 5 , wherein
 the conductive substrate has a principal surface facing the catalyst layer, the principal surface being a rough surface.   
     
     
         7 . The electrolysis electrode of  claim 2 , wherein
 the catalyst layer has a plurality of recesses recessed from a principal surface on an opposite side of the catalyst layer from the conductive substrate,   the tantalum oxide layer has
 a first portion provided on the principal surface in the catalyst layer and 
 a second portion provided on an inner surface of at least one recess of the plurality of recesses in the catalyst layer. 
   
     
     
         8 . The electrolysis electrode of  claim 2 , further comprising
 an intermediate layer provided between the conductive substrate and the catalyst layer, the intermediate layer including platinum.   
     
     
         9 . The electrolysis electrode of  claim 3 , further comprising
 an intermediate layer provided between the conductive substrate and the catalyst layer, the intermediate layer including platinum.   
     
     
         10 . The electrolysis electrode of  claim 4 , further comprising
 an intermediate layer provided between the conductive substrate and the catalyst layer, the intermediate layer including platinum.   
     
     
         11 . The electrolysis electrode of  claim 8 , wherein
 the conductive substrate has a principal surface facing the catalyst layer, the principal surface being a rough surface.   
     
     
         12 . The electrolysis electrode of  claim 9 , wherein
 the conductive substrate has a principal surface facing the catalyst layer, the principal surface being a rough surface.   
     
     
         13 . The electrolysis electrode of  claim 10 , wherein
 the conductive substrate has a principal surface facing the catalyst layer, the principal surface being a rough surface.