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High-angle annular dark field scanning transmission electron microscopy (STEM-HAADF) and STEM-energy dispersive X-ray spectroscopy (STEM-EDS) images of the AuPtPd/SnO2 catalyst powder. (a) STEM-HAADF image and EDS maps of Au, Pt, Pd, Sn, and Overlap (Au-Pt-Pd) at low magnification (110,000), and (b) STEM-HAADF image and EDS maps of Au, Pt, Pd, Sn, and Overlap at high magnification (630,000).
