The effect of thermal treatment on the atomic structure of core–shell PtCu nanoparticles in PtCu/C electrocatalysts

被引：0
|
作者：
V. V. Pryadchenko
S. V. Belenov
D. B. Shemet
V. A. Volochaev
V. V. Srabionyan
L. A. Avakyan
N. Yu. Tabachkova
V. E. Guterman
L. A. Bugaev
机构：
[1] Southern Federal University,
[2] National University of Science and Technology MISiS,undefined
来源：
Physics of the Solid State | 2017年 / 59卷
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摘要：
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 PtL3 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.
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页码：1666 / 1673
页数：7
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