Abstract: The invention relates to a process for preparing nanoparticles of a catalyst for cathodic reduction and which is tolerant to methanol, these nanoparticles comprising a metallic center and a submonolayer of a chalcogen.

Abstract: The present invention relates to nanoparticles comprising at least one platinum compound comprising at least platinum and at least one rare earth, said rare earth being present in an oxidized form, notably useful for the catalysis of the reduction reaction of dioxygen (RRO) in an acid medium, and methods for the preparation thereof. The invention also relates to a cathode comprising said nanoparticles and its use notably in a hydrogen fuel cell, also called PEMFC.

Abstract: The invention relates to a process for preparing nanoparticles of a catalyst for cathodic reduction and which is tolerant to methanol, these nanoparticles comprising a metallic centre and a submonolayer of a chalcogen.

Abstract: The present teachings are directed to preparation of carbon-supported CoSe2 nanoparticles via an in situ surfactant free method, and use of the same for oxygen reduction and hydrogen evolution reactions. The CoSe2 nanoparticles have two kinds of structure after heat treatment at different temperatures: orthorhombic at 300° C. and cubic at 400° C. The latter structure has higher oxygen reduction activity and hydrogen evolution activity than the former in 0.5 M H2SO4. Electron transfers of about 3.5- and about 3.7-electrons were observed for 20 wt. % CoSe2/C nanoparticles, after heat treatment at 300° C. and 400° C., per oxygen molecule during the oxygen reduction process, respectively.

Abstract: A methanol-tolerant cathode catalyst and a membrane electrode assembly for fuel cells that includes such a cathode catalyst. The cathode catalyst includes a support having at least one transition metal in elemental form and a chalcogen disposed on the support. Methods of making the cathode catalyst and membrane electrode assembly are also described.

Abstract: A methanol-tolerant cathode catalyst and a membrane electrode assembly for fuel cells that includes such a cathode catalyst. The cathode catalyst includes a support having at least one transition metal in elemental form and a chalcogen disposed on the support. Methods of making the cathode catalyst and membrane electrode assembly are also described.

Abstract: A methanol-tolerant cathode catalyst and a membrane electrode assembly for fuel cells that includes such a cathode catalyst. The cathode catalyst includes a support having at least one transition metal in elemental form and a chalcogen disposed on the support. Methods of making the cathode catalyst and membrane electrode assembly are also described.

Abstract: A methanol-tolerant cathode catalyst and a membrane electrode assembly for fuel cells that includes such a cathode catalyst. The cathode catalyst includes a support having at least one transition metal in elemental form and a chalcogen disposed on the support. Methods of making the cathode catalyst and membrane electrode assembly are also described.