Fig. 2: Synthesis and structural characterizations of catalysts. | Nature Communications

Fig. 2: Synthesis and structural characterizations of catalysts.

From: Tandem microplastic degradation and hydrogen production by hierarchical carbon nitride-supported single-atom iron catalysts

Fig. 2

a Schematic illustration of FeSA-hCN. b SEM image of FeSA-hCN. c Aberration-corrected high-angle annular dark field scanning transmission electron microscopy (AC HAADF-STEM) image of FeSA-hCN and the corresponding line intensity profile along the red arrow (inset of Fig. 2c). d C and N K-edge XANES of FeSA-hCN, hCN, and CN. arb. u., arbitrary units. e Normalized Fe K-edge XANES of FeSA-hCN, Fe foil, FeO, Fe2O3, and FePc, with the average oxidation state of Fe in FeSA-hCN very close to FeO ( + 2). f k2-weighted Fourier transform (FT) of the EXAFS spectra of FeSA-hCN, Fe foil, Fe2O3, and FePc. EXAFS fitted result of FeSA-hCN in R-space was presented in scatter type. g Wavelet transform (WT) EXAFS plot of FeSA-hCN. h, The theoretical model of Fe-C3N4 for the representation of FeSA-hCN according to the Fe K-edge EXAFS analysis result.

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