Figure 1: Structural and compositional characterization of NiSe.
From: A nickel iron diselenide-derived efficient oxygen-evolution catalyst
(a,b) TEM and HRTEM images and SAED patterns before (a) and after (b) OER. (c,d) Elemental mapping images and corresponding EDS before and after OER. Colours in elemental mapping images: green for Ni; and blue for Se. Cu and C signals in the EDS are from the copper grid and carbon film that are used to support the sample for TEM measurements. K is due to the residual electrolyte (1 M KOH). The inset in the spectra shows the elemental atomic percentages. Scale bar: (a) 50 nm; and (b) 50 nm. Insets in a,b, 2 nm; and c, 20 nm. EDS, energy-dispersive spectroscopy.
