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. Author manuscript; available in PMC: 2019 Jan 16.
Published in final edited form as: Nat Mater. 2018 Jul 16;17(9):827–833. doi: 10.1038/s41563-018-0133-2

Figure 1. Morphological, structural and chemical characterizations of the various PtNi nanocatalysts synthesized in this study.

Figure 1

Transmission electron microscopy (TEM) image, associated particle size distribution (upper right insert) and scanning electron transmission microscopy coupled with X-ray energy dispersive spectroscopy (STEM/X-EDS) elemental map (lower right insert) of a) Sphere PtNi/C, b) Cube PtNi/C, c) Octahedron PtNi/C, d) Hollow PtNi/C, e) Aerogel PtNi and f) Sponge PtNi/C. High-angle annular dark-field-high resolution scanning transmission electron microscopy (HAADF-HRSTEM) image with insertion of its associated fast Fourier transform pattern of g) Cube Pt/C and h) Hollow PtNi/C. The HAADF-HRSTEM images highlight the monocrystalline nature of the ‘structurally-ordered’ catalyst family (Sphere PtNi/C, Cube PtNi/C and Octahedron PtNi/C) whereas the ‘structurally-disordered’ family (Hollow PtNi/C, Aerogel PtNi and Sponge PtNi/C) features highly polycrystalline nanoparticles. For the Sponge PtNi/C catalyst, the particle size distribution in f) reflects the size of the overall aggregates.