Electrode for evolution of gaseous products and method of manufacturing thereof

Abstract

The invention relates to an electrode suitable as anode for evolution of gaseous products comprising a metal substrate coated with at least one titanium suboxide layer having an interconnected porosity and containing catalytic noble metal oxides. The invention further relates to a method of manufacturing such electrode comprising applying a mixture of titanium suboxides and noble metal oxide-based catalyst on a valve metal substrate via cold gas spray technique.

1 . An electrode for evolution of gaseous products in electrolytic cells comprising a valve metal substrate whereto at least one layer of a coating having an interconnected porosity is attached, said at least one layer being comprised of titanium suboxides expressed by the formula Ti x O 2x-1 , with x ranging between 4 and 10, in admixture with at least one catalyst based on noble metals or oxides thereof, the specific catalyst loading being comprised between 0.1 and 25 g/m 2 . 
     
     
         2 . An electrode for evolution of gaseous products in electrolytic cells comprising a valve metal substrate whereto at least one layer of a coating having an interconnected porosity is attached, said at least one layer being comprised of titanium suboxides expressed by the formula Ti x O 2x-1 , with x ranging from 4 to 10, in admixture with at least one catalyst based on noble metals or oxides thereof, said at least one layer being deposited on said substrate by cold gas spray technique. 
     
     
         3 . The electrode according to  claim 1  wherein said valve metal of said substrate is titanium. 
     
     
         4 . The electrode according to  claim 1  wherein said at least one coating layer attached to the substrate has an apparent density of 75 to 95% of the overall theoretical density of said layer. 
     
     
         5 . The electrode according to  claim 1  wherein the specific catalyst loading in least one coating layer ranges between 0.1 and 10 g/m 2 . 
     
     
         6 . The electrode according to  claim 1  wherein said at least one catalyst based on noble metal oxides consists of iridium oxide. 
     
     
         7 . A method for manufacturing an electrode according to  claim 1  comprising the following steps:
 preparing of a powder of titanium suboxides expressed by the formula Ti x O 2x-1 , with x ranging between 4 and 10, 
 impregnating impregnation of said powder with a precursor solution of a noble metal or noble metal oxide-based catalyst 
 carrying out thermal decomposition, and 
 carrying out deposition of said powder on a valve metal substrate by cold gas spray technique. 
 
     
     
         8 . The electrolysis cell comprising a cathodic compartment containing a cathode and an anodic compartment containing an anode, wherein said anode of said anodic compartment is an electrode according to  claim 1 . 
     
     
         9 . The industrial electrochemical process comprising carrying out anodic evolution of a gas on an electrode according to  claim 1  from an electrolytic bath.