The effect of thermal treatment on the atomic structure of core–shell PtCu nanoparticles in PtCu/C electrocatalysts
| Autor: | Lusegen A. Bugaev, V. V. Pryadchenko, Vladimir E. Guterman, V. V. Srabionyan, D. B. Shemet, V. A. Volochaev, S. V. Belenov, N. Yu. Tabachkova, Leon A. Avakyan |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Extended X-ray absorption fine structure Nanoparticle chemistry.chemical_element 02 engineering and technology Thermal treatment 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Copper 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Chemical engineering Transmission electron microscopy 0210 nano-technology Bimetallic strip Powder diffraction Solid solution |
| Zdroj: | Physics of the Solid State. 59:1666-1673 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783417080200 |
| Popis: | PtCu/C electrocatalysts with bimetallic PtCu nanoparticles were synthesized by successive chemical reduction of Cu2+ and Pt(IV) in a carbon suspension prepared based on an aqueous ethylene glycol solution. The atomic structure of as-prepared PtCu nanoparticles and nanoparticles subjected to thermal treatment at 350°C was examined using PtL 3 and CuK EXAFS spectra, transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). The results of joint analysis of TEM microphotographs, XRD profiles, and EXAFS spectra suggest that the synthesized electrocatalysts contain PtCu nanoparticles with a Cu core–Pt shell structure and copper oxides Cu2O and CuO. Thermal treatment of electrocatalysts at 350°C results in partial reduction of copper oxides and fusion of bimetallic nanoparticles with the formation of both homogeneous and ordered PtCu solid solutions. |
| Databáze: | OpenAIRE |
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