Truncated Octahedral Pt3ni Oxygen Reduction Reaction Electrocatalysts
This communication describes the preparation of carbon-supported truncated-octahedral Pt3Ni nanoparticle catalysts for the oxygen reduction reaction. Besides the composition, size, and shape controls, this work develops a new butylamine-based surface treatment approach for removing the long-alkane-chain capping agents used in the solution-phase synthesis. These Pt3Ni catalysts can have an area-specific activity as high as 850 μA/cm2Pt at 0.9 V, which is ∼4 times better than the commercial Pt/C catalyst (∼0.2 mA/cm2Pt at 0.9 V). The mass activity reached 0.53 A/mgPt at 0.9 V, which is close to a factor of 4 increase in mass activity, the threshold value that allows fuel-cell power trains to become cost-competitive with their internal-combustion counterparts. Our results also show that the mass activities of these carbon-supported Pt3Ni nanoparticle catalysts strongly depend on the (111) surface fraction, which validates the results of studies based on Pt3Ni extended-single-crystal surfaces, suggesting that further development of catalysts with still higher mass activities is highly plausible.
Peng, Zhenmeng, "Truncated Octahedral Pt3ni Oxygen Reduction Reaction Electrocatalysts" (2010). Chemical and Biomolecular Engineering Faculty Research. 315.