Abstract
The invention relates to a porous material in the form of iridium and/or iridium oxide based microspheres, the preparation method thereof, the use thereof as an anode catalyst in a water electrolyserbased on a solid polymer electrolyte, also called PEM ("Proton Exchange Membrane" or "Polymer Electrolyte Membrane") water electrolyser, or for manufacturing light-emitting diodes for various electronic devices or for motor vehicles, and a PEM water electrolyser comprising such a material as anode catalyst.