Probing the nanoscale structure of the catalytically active overlayer on Pt alloys with rare earths
| Autor: | Ifan E. L. Stephens, Ib Chorkendorff, Anders Pedersen, Tobias Peter Johansson, Paolo Malacrida, María Escudero-Escribano, Kim Degn Jensen, Elisabeth Therese Ulrikkeholm, Jan Rossmeisl, Daniel Friebel, Anders Nilsson, Christoffer Mølleskov Pedersen, Martin Hangaard Hansen |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Materials science Renewable Energy Sustainability and the Environment 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Overlayer Crystallinity Crystallography General Materials Science Crystallite Electrical and Electronic Engineering Thin film 0210 nano-technology Nanoscopic scale |
| Zdroj: | Nano Energy. 29:249-260 |
| ISSN: | 2211-2855 |
| Popis: | PtxY and PtxGd exhibit exceptionally high activity for oxygen reduction, both in the polycrystalline form and the nanoparticulate form. In order to understand the origin of the enhanced activity of these alloys, we have investigated thin films of these alloys on bulk Pt(111) crystals, i.e. Y/Pt(111) and Gd/Pt(111). These surfaces exhibit a 4-fold improvement over Pt(111). We observe the formation of a thick Pt overlayer after the electrochemical measurements, both on Y/Pt(111) and Gd/Pt(111). Using surface sensitive X-ray diffraction we revealed that crystalline closely packed Pt overlayers were formed. The diffraction experiments showed that the strain and crystallinity of the overlayers are strongly dependent on the electrochemical treatment, and in general show lateral compression. |
| Databáze: | OpenAIRE |
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