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Platinum Monolayer on IrFe Core–Shell Nanoparticle Electrocatalysts for the Oxygen Reduction Reaction

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Abstract

We synthesized high activity and stability platinum monolayer on IrFe core–shell nanoparticle electrocatalysts. Carbon-supported IrFe core–shell nanoparticles were synthesized by chemical reduction and subsequent thermal annealing. The formation of Ir shells on IrFe solid-solution alloy cores has been verified by scanning transmission electron microscopy coupled with energy-loss spectroscopy (EELS) and in situ X-ray absorption spectroscopy. The Pt monolayers were deposited on IrFe core-shell nanoparticles by galvanic replacement of underpotentially deposited Cu adatoms on the Ir shell surfaces. The specific and Pt mass activities for the ORR on the Pt monolayer on IrFe core-shell nanoparticle electrocatalyst are 0.46 mA/cm2 and 1.1 A/mgPt, which are much higher than those on a commercial Pt/C electrocatalyst. High durability of PtML/IrFe/C has also been demonstrated by potential cycling tests. These high activity and durability observed can be ascribed to the structural and electronic interaction between the Pt monolayer and the IrFe core–shell nanoparticles.

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Acknowledgements

This work is supported by the US Department of Energy, Divisions of Chemical and Material Sciences under contract no. DE-AC02-98CH10886. Beamlines X19A at the NSLS are supported in part by the Synchrotron Catalysis Consortium, US Department of Energy grant no. DE-FG02-05ER15688.

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Authors and Affiliations

  1. Chemistry Department, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Kotaro Sasaki, Kurian A. Kuttiyiel & Radoslav R. Adzic

  2. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Dong Su

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  1. Kotaro Sasaki
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  2. Kurian A. Kuttiyiel
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  3. Dong Su
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  4. Radoslav R. Adzic
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Correspondence to Radoslav R. Adzic.

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Sasaki, K., Kuttiyiel, K.A., Su, D. et al. Platinum Monolayer on IrFe Core–Shell Nanoparticle Electrocatalysts for the Oxygen Reduction Reaction. Electrocatal 2, 134–140 (2011). https://doi.org/10.1007/s12678-011-0048-z

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