IRIDIUM RUTHENIUM OXIDE CATALYST
Hydrogen produced by proton exchange membrane (PEM) electrolysis technology is purer than any other form of hydrogen production. In order to compete with alternative forms of hydrogen production, a high efficiency electrolyser is required.
The electrochemical energy losses in a PEM electrolyser are primarily due to the large overpotential at the oxygen evolution anode. These losses can be minimised through the use of a high surface area, electrochemically active, and stable anodic electrocatalyst.
IrO₂ and RuO₂ are well established as anodic catalysts prepared by thermal decomposition of metal precursors onto titanium substrates. This method is unsuitable for PEM electrolysers due to the difficulty in obtaining intimate contact between the electrocatalyst and the ionically conductive membrane.
The iridium ruthenium nano-crystalline powder produced by TFP Hydrogen Products can be applied to the membrane as an ink. It has a low overpotential for the oxygen evolution reaction compared to standard IrO₂ and is stable under strong oxidation conditions.
Key to the catalyst longevity is the formation of an iridium-ruthenium solid solution.