Patent ID: 7338732

Claim:
A gas diffusion electrode comprising: (i) an electrically conducting porous structure; (ii) a first catalytic component, said first catalytic component being embedded within the porous structure and being a gas-phase catalyst designed to remove contaminant gases, wherein said first catalytic component comprises a first catalyst which is one or more noble metals or non-noble metals or a combination thereof, and wherein said first catalyst is directly supported on an electrically non-conducting support; and (iii) a second catalytic component, said second catalytic component being applied to the porous structure as a surface layer and being an electrocatalyst adapted to facilitate an electrochemical reaction, wherein said second catalytic component comprises a second catalyst which is a precious metal or a transition metal as a metal or a metal oxide, either unsupported or supported in a dispersed form on a carbon support; an organic complex, in the form of a high surface area finely divided powder or fibre; or a combination thereof.