Voltage efficiency of alkaline water electrolysis by using a mixed metal oxide cathode catalyst

Abstract

A mixed metal oxide electrode for alkaline water electrolysis. The mixed metal oxide comprises Ir, Ru, and a non-noble metal selected from periods 4, 5 and 6 of the periodic table such as W, Ce, Ni, V and Co.

1 . An electrode for alkaline water electrolysis comprising:
 a mixed metal oxide comprising of: Ir, Ru, and a non-noble metal selected from the group consisting of: elements selected from periods 4, 5 and 6 of the periodic table.   
     
     
         2 . The electrode of  claim 1 , wherein the non-noble metal is selected from the group consisting of W, Ce, Ni, V and Co. 
     
     
         3 . The electrode of  claim 1 , wherein the electrode is a cathode electrode. 
     
     
         4 . The electrode of  claim 1 , wherein Ir and Ru are at equimolar ratios of each other. 
     
     
         5 . The electrode of  claim 1 , wherein hydroxide ions are produced by the electrode during the alkaline water electrolysis. 
     
     
         6 . The electrode of  claim 1 , wherein the non-noble metal is Co. 
     
     
         7 . The electrode of  claim 1 , wherein the mixed metal oxide consists essentially of: Ir, Ru, and a non-noble metal selected from the group consisting essentially of: elements selected from periods 4, 5 and 6 of the periodic table. 
     
     
         8 . The electrode of  claim 1 , wherein the molar ratio of Ir:Ru:non-noble metal is 0.25:0.25:0.50. 
     
     
         9 . An cathode electrode for generating hydroxide ions for an alkaline water electrolysis comprising:
 a mixed metal oxide consisting essentially of Ir, Ru and Co in a molar ratio of 0.25:0.25:0.50.