A stepwise method is described for the accurately controlled growth of Pt nanoparticles supported on ordered mesoporous carbons (PtOMC) by the nanocasting of carbon and metal precursors in the pore channels of mesoporous silicas functionalized with SiH groups. Results obtained from N2 adsorption/desorption isotherms and transmission electron microscopy showed well-dispersed Pt nanoparticles (23 nm) on PtOMC with high surface area (837 m2 g-1) and regular pore channels (2.9 nm), which facilitate reactant/product diffusion. X-ray diffraction and X-ray photoelectron spectroscopy indicated that Pt nanoparticles in the PtOMC sample were mostly present in the metallic form of a face-centered cubic (fcc) crystalline structure. The PtOMC catalyst was found to have superior electrocatalytic properties during oxygen reduction reaction as compared to typical commercial electrocatalysts.
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