Abstract's Details

Electronic Structure Effect in Improved Catalytic Activity of Strained Alloy Nanoparticles
Abstract ID	MAT-28
Presenter	Toyli Anniyev
Presentation Type	Poster
Full Author List	T. Anniyev (1), J. Leisch (1), S. Koh (2), S. Yu (2), S. Kelly (3), L. Naslund (1), H. Ogasawara (1), P. Strasser (2), M. F. Toney (1), A. Nilsson (1)
Affiliations	(1) Stanford Synchrotron Radiation Laboratory (2) Dept. of Chemical and Biomolecular Engineering, University of Houston (3) Dept. of Material Sciences, Stanford University
Category	Materials Science
Abstract	A new family of Pt-Cu nanoparticle alloy electrocatalysts were identified as having the highest ever reported ORR activities of up to 5-6x compared to pure Pt electrocatalysts. The composition of the surface, lattice arrangement and electronic structure of these catalysts has been characterized by synchrotron based x-ray diffraction and photoelectron spectroscopy methods. The results obtained show that there is a Cu-Pt alloy shell in these nanopaticles, indicating the formation of a core-shell structure upon dealloying. We found a narrowing of the Pt d-band upon lattice contraction.
Footnotes
Funding Acknowledgement	This work was supported by the Division of Material Sciences and Engineering, Office of Basic Energy Sciences, Department of Energy under the auspices of the President's Hydrogen Fuel Initiative, and through the Stanford Synchrotron Radiation Laboratory.