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Active and Stable Ir@Pt Core–Shell Catalysts for Electrochemical Oxygen Reduction

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Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
Cite this: ACS Energy Lett. 2017, 2, 1, 244–249
Publication Date (Web):December 28, 2016
https://doi.org/10.1021/acsenergylett.6b00585
Copyright © 2016 American Chemical Society

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    Electrochemical oxygen reduction is an important reaction for many sustainable energy technologies, such as fuel cells and metal–air batteries. Kinetic limitations of this reaction, expensive electrocatalysts, and catalyst instability, however, limit the commercial viability of such devices. Herein, we report an active Ir@Pt core–shell catalyst that combines platinum overlayers with nanostructure effects to tune the oxygen binding to the Pt surface, thereby achieving enhanced activity and stability for the oxygen reduction reaction. Ir@Pt nanoparticles with several shell thicknesses were synthesized in a scalable, inexpensive, one-pot polyol method. Electrochemical analysis demonstrates the activity and stability of the Ir@Pt catalyst, with specific and mass activities increasing to 2.6 and 1.8 times that of commercial Pt/C (TKK), respectively, after 10 000 stability cycles. Activity enhancement of the Ir@Pt catalyst is attributed to weakening of the oxygen binding to the Pt surface induced by the Ir core.

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    • Details of catalyst preparation, material and electrochemical characterization, performance of additional Ir@Pt compositions, and XPS analysis (PDF)

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