Fig. 2: Synthesis and characterization of catalysts. | Nature Communications

Fig. 2: Synthesis and characterization of catalysts.

From: Tailoring bidirectional electronic transfer interaction tunnels triggers sustainable and high activity of ozone catalysis for water purification

Fig. 2

Schematic of catalyst synthesis (A). High-resolution transmission electron microscope (HR-TEM) image (B) and energy dispersive X-ray spectroscopy (EDX) elemental mapping of Mn–Fe–NC catalyst (C). High-angle annular dark-field scanning transmission electron microscope (HAADF-STEM) image of Mn–Fe–NC catalyst (D). Site A (marked by red boxes) and Site B (marked by yellow circles) represent triatomic clusters and isolated single atoms, respectively. Insets in (D) depict the proportion of Site A and the Mn/Fe interatomic distances. Mn–Fe–NC catalyst structure analyzed by atomically resolved electron energy-loss spectroscopy (EELS) (E). Insets in (E) display atom-resolved EDX mapping. The intensity profiles obtained on Mn/Fe sites (F) and Fe–Fe sites (G). Mn K-edge X-ray absorption near-edge structure (XANES) spectra of Mn–NC, Mn–Mn–NC, Mn–Fe–NC catalyst and reference samples (H). Extended X-ray absorption fine structure (EXAFS) fitting curves of Mn–Fe–NC catalyst at the Mn K-edge (I) and Fe K-edge (J) in R space. Insets in (I, J) are the corresponding atom configurations. Purple balls for Mn, orange balls for Fe, blue balls for N, and cyan balls for C.

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