Abstract
Porous and single crystalline platinum (Pt) nanoparticles (NPs) have been successfully synthesized by reduction of H2PtCl6·6H2O and then investigated by optical spectroscopy and transmission electron microscopy. H2PtCl6·6H2O was reduced using ethylene glycol in the presence of polyvinylpyrrolidone under highly acidic conditions (pH < 1) to form single crystalline Pt particles about 5 nm in size. These particles were then stacked via {100} facets, forming 50-nm length porous nanocubes with a mosaic structure. The porous Pt NPs exhibited excellent catalytic properties for methanol oxidation. In particular, the electrochemical surface area was ∼63 m2/g, five times higher than that for non-porous Pt NPs prepared using a conventional method. We suggest that the high catalytic activity of porous Pt NPs is due to a combination of the crystalline structure having exposed {100} facets and a porous morphology. Open image in new window
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