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Until now, the fabrication of electrocatalysts to guarantee long life of fuelcells and low consumption of noble metals remains a major challenge. Theelectrocatalysts based on metals or metal oxides which are used today arelimited by the complexity of their synthesis processes and require severalsteps before depositing the catalysts on the substrate. Herein is described achemical synthesis process that consists of a single-step synthesis and directdeposition of catalysts nanoparticles such as gold (Au), palladium (Pd) andplatinum (Pt) in the thickness of a carbon-fibers-based porous transport layer(PTL). The synthesis process essentially consists of dissolving in the samePGMEA (Propylene glycol methyl ether acetate) solvent a metal precursor (HAuCl4or PdNO2 or PtCl4) and a homopolymer PMMA (Polymethylmetacrylate), then themetal solution is deposited on the surface of the PTL after cleaning. Specialemphasis is made on Pt-based materials. The obtained PTL-supportednanoparticles were firstly characterized by scanning electron microscopy (SEM)to evaluate their morphology, and then X-Ray diffraction (XRD) to observe thecrystal phases. To validate the methodology, Pt-coated PTL materials have beenused as anode for the borohydride oxidation reaction (BOR) in a directborohydride fuel cell (DBFC) and compared to a state-of-the-art nickelelectrode. There is an optimum loading of platinum (below 0.16 mg Pt/cm2) whichconstitutes the best compromise between power density and faradic efficiencyfor the borohydride oxidation reaction (BOR). Thanks to this low Pt loading,hydrogen evolved during the anodic reaction is completely valorized. Theseelectrodes combine the advantages of high-performance with a very low metalloading, hence lowering materials cost.

Synthesis of metallic nanoparticles for heterogeneous catalysis: Application to the Direct Borohydride Fuel Cell