fig12

From: Layered double hydroxide-based single-atom catalysts: precise catalyst design on a two-dimensional ‘atomic canvas’

Figure 12. TEM images of (A) mono-NiFe and (B) Ru₁/mono-NiFe-0.3; (C) HRTEM image of Ru₁/mono-NiFe-0.3; (D) HAADF-STEM image of Ru₁/mono-NiFe-0.3; (E) The Ru K-edge XANES spectra; (F) the Ru K-edge EXAFS k²χ functions for Ru₁/mono-NiFe-1.6, Ru₁/mono-NiFe-0.3, RuCl₃, RuO₂ and Ru Foil; (G) the wavelet transforms for the k²-weighted EXAFS signals of Ru₁/mono-NiFe-0.3, RuO₂ and Ru Foil; (H) the magnitude of k²-weighted Fourier transforms of the Ru K-edge EXAFS spectra for Ru₁/mono-NiFe-0.3, Ru₁/mono-NiFe-1.6, RuO₂ and Ru Foil; (I) schematic illustration of Ru₁/mono-NiFe-x. (A-I) Reprinted with permission from Ref.^[113] Copyright 2019, The Royal Society of Chemistry. TEM: Transmission electron microscopy; HRTEM: high-resolution transmission electron microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; XANES: X-ray absorption near edge structure; EXAFS: extend X-ray absorption fine structure.