Electrochemical and Structural Study of a Chemically Dealloyed PtCu Oxygen Reduction Catalyst
| Autor: | Michael K. Carpenter, Michael P. Balogh, Mohammed Atwan, Irish Nicholas P, Joseph M. Ziegelbauer, Thomas E. Moylan, Indrajit Dutta |
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| Rok vydání: | 2013 |
| Předmět: |
Annealing (metallurgy)
Chemistry Electron energy loss spectroscopy Nanoparticle Article Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Chemical engineering Scanning transmission electron microscopy Physical chemistry Particle size Physical and Theoretical Chemistry Cyclic voltammetry Rotating disk electrode |
| Zdroj: | The journal of physical chemistry. C, Nanomaterials and interfaces. 114(39) |
| ISSN: | 1932-7447 |
| Popis: | A carbon-supported, dealloyed platinum-copper (Pt-Cu) oxygen reduction catalyst was prepared using a multi-step synthetic procedure. Material produced at each step was characterized using high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), electron energy loss spectroscopy (EELS) mapping, x-ray absorption spectroscopy (XAS), x-ray diffraction (XRD), and cyclic voltammetry (CV), and its oxygen reduction reaction (ORR) activity was measured by a thin-film rotating disk electrode (TF-RDE) technique. The initial synthetic step, a co-reduction 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. TEM shows the annealed catalyst to include particles of various sizes, large (>25 nm), medium (12-25 nm), and small ( |
| Databáze: | OpenAIRE |
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