Figure 5: Comparison of NixFe1−xSe2-DO with NixFe1−xSe2. | Nature Communications

Figure 5: Comparison of NixFe1−xSe2-DO with NixFe1−xSe2.

From: A nickel iron diselenide-derived efficient oxygen-evolution catalyst

Figure 5

(a,b) Elemental mapping images (a) and the corresponding EDS (b). Colour in elemental mapping images: red for Ni; green for Fe; blue for Se; cyan for O. Scar bar, 40 nm. The inset in the spectra shows the elemental atomic percentages. (c–e) High-resolution XPS spectra of Se 3d (c) O 1s (d) and Ni 2p3/2 (e). In O1s, the minor peaks of 528.8 and 532.3 eV can be assigned to lattice oxygen (O2−) and adsorbed molecular water, respectively. (f) PXRD patterns. The asterisks ‘*’ mark the diffraction peaks from the nickel foam substrate. EDS, energy-dispersive spectroscopy.

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