Abstract: The invention relates to a method for fabricating nanowires and a method for fabricating an electrode of an electro-chemical device. The nanowire fabrication method according to the invention comprises: a) a step of depositing, on one of the faces of the matrix comprising hole openings, at least one porous layer, having a porosity equal to or higher than 26% by volume, of nanoparticles of a conductive material having their smallest dimension at least equal to the diameter of the holes in the matrix, the nanoparticles being in electrical contact with one another, b) growing the nanowires in the holes of the matrix, and c) removing the matrix. The invention has an application in the field of electrochemical devices in particular.

Abstract: Sulphidation method for a UO2 powder, in which said powder is sulfurated by bringing it into contact with a gaseous sulphidation agent. Method for manufacturing nuclear fuel pellets based on uranium oxide, or mixed oxide of uranium and plutonium, from a load of totally or partially sulfurated UO2 powder or UO2 powder and PuO2 powder, by lubrication, pelletizing and sintering, in which: the load of powder subjected to the lubrication, pelletizing and sintering is prepared by the following successive steps: sulphidation of a UO2 powder by the above sulphidation method; optionally mixing, said sulfurated powder in a matrix comprising a UO2 powder, or of a UO2 powder and a PuO2 powder; and, subjecting said load, formed from said sulfurated powder or said mixture, to lubrication, pelletizing and sintering operations.