Fig. 2: Morphology and atomic local structure characterization of A-Fe2S1N5/SNC. | Nature Communications

Fig. 2: Morphology and atomic local structure characterization of A-Fe2S1N5/SNC.

From: High-density asymmetric iron dual-atom sites for efficient and stable electrochemical water oxidation

Fig. 2

a SEM; b HRTEM; and c EDS mapping images of Fe, S, N, and C for A-Fe2S1N5/SNC (scale bar: 200 nm). d Aberration-corrected HAADF-STEM image of A-Fe2S1N5/SNC. Inset: magnified region D, and the dual Fe sites are indicated by yellow ovals. e 3D model and the statistical Fe–Fe distance in the observed diatomic pairs A (top) and the intensity profile along the X–Y direction in regions B and C (bottom) of (d). f Electron energy loss spectroscopy (EELS) of A-Fe2S1N5/SNC. g Fe K-edge XANES spectra (inset shows the magnified corresponding near-edge region), h FT k3-weighted Fe K-edge EXAFS spectra, and i WT-EXAFS plots of A-Fe2S1N5/SNC, Fe foil, FePc, and FeS2. Inset i: atomic configuration model of A-Fe2S1N5/SNC.

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