NDLI: Origin of oxygen reduction reaction activity on “pt3co ” nanoparticles: atomically resolved chemical compositions and structures.

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Origin of oxygen reduction reaction activity on “pt3co ” nanoparticles: atomically resolved chemical compositions and structures.

Content Provider	CiteSeerX
Author	Chen, Shuo Sheng, Wenchao Yabuuchi, Naoaki Ferreira, Paulo J. Allard, Lawrence F. Shao-Horn, Yang
Abstract	Rotating disk electrode measurements of acid-treated “Pt3Co ” nanoparticles showed specific oxygen reduction reaction (ORR) activity (∼0.7 mA/cmPt 2 at 0.9 V vs RHE in 0.1 M HClO4 at room temperature), twice that of Pt nanoparticles. Upon annealing at 1000 K in vacuum, the ORR activity at 0.9 V was increased to ∼1.4 mA/cmPt 2 (four times that of Pt nanoparticles). High-resolution transmission electron microscopy and aberrationcorrected high-angle annular dark-field in the scanning transmission electron microscope was used to reveal surface atomic structure and chemical composition variations of “Pt3Co ” nanoparticles on the atomic scale. Such information was then correlated to averaged Pt-Pt distance obtained from synchrotron X-ray powder diffraction data, surface coverage of oxygenated species from cyclic voltammograms, and synchrotron X-ray absorption spectroscopy. It is proposed that ORR activity enhancement of acid-leached “Pt3Co ” relative to Pt nanoparticles is attributed to the formation of a percolated structure with Pt-rich and Pt-poor regions within individual particles, while the increase in the specific ORR activity of annealed “Pt3Co ” nanoparticles relative to Pt can be attributed to the presence of surface Pt segregation. 1.
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Subject Keyword	Pt3co Nanoparticles Resolved Chemical Composition Pt Nanoparticles Oxygen Reduction Reaction Activity Ma Cmpt Acid-leached Pt3co Relative Percolated Structure Pt-pt Distance Room Temperature Acid-treated Pt3co Nanoparticles Orr Activity Enhancement X-ray Absorption Spectroscopy Individual Particle Surface Atomic Structure Synchrotron X-ray Powder Diffraction Data Pt-poor Region V Rhe High-angle Annular Dark-field High-resolution Transmission Electron Microscopy Specific Orr Activity Chemical Composition Variation Surface Coverage Cyclic Voltammograms Oxygenated Specie Scanning Transmission Annealed Pt3co Nanoparticles Atomic Scale Disk Electrode Measurement Surface Pt Segregation Specific Oxygen Reduction Reaction Orr Activity
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