Electrochemical and Structural Study of a Chemically Dealloyed PtCu Oxygen Reduction Catalyst

A carbon-supported, dealloyed platinum−copper (Pt−Cu) oxygen reduction catalyst was prepared using a multistep synthetic procedure. Material produced at each step was characterized using high-angle annular dark-field scanning transmission electron microscopy, electron energy loss spectroscopy mappin...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2010-10, Vol.114 (39), p.16309-16320
Main Authors: Dutta, Indrajit, Carpenter, Michael K, Balogh, Michael P, Ziegelbauer, Joseph M, Moylan, Thomas E, Atwan, Mohammed H, Irish, Nicholas P
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ALLOYS
ANNEALING
C: Nanops and Nanostructures
CATALYSTS
CHEESE
COPPER
ELECTRODES
ELECTRONS
ENERGY-LOSS SPECTROSCOPY
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MORPHOLOGY
OXYGEN
PARTICLE SIZE
SURFACE AREA
THERMAL DIFFUSION
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
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Summary:A carbon-supported, dealloyed platinum−copper (Pt−Cu) oxygen reduction catalyst was prepared using a multistep synthetic procedure. Material produced at each step was characterized using high-angle annular dark-field scanning transmission electron microscopy, electron energy loss spectroscopy mapping, X-ray absorption spectroscopy, X-ray diffraction, and cyclic voltammetry, and its oxygen reduction reaction (ORR) activity was measured by a thin-film rotating disk electrode technique. The initial synthetic step, a coreduction of metal salts, produced a range of poorly crystalline Pt, Cu, and Pt−Cu alloy nanoparticles that nevertheless exhibited good ORR activity. Annealing this material alloyed the metals and increased particle size and crystallinity. Transmission electron microscopy shows the annealed catalyst to include particles of various sizes, large (>25 nm), medium (12−25 nm), and small (
ISSN:1932-7447
1932-7455
DOI:10.1021/jp106042z