Fig. 1: Morphological characterization of the synthesized W-ACs. | Nature Communications

Fig. 1: Morphological characterization of the synthesized W-ACs.

From: Thermal migration towards constructing W-W dual-sites for boosted alkaline hydrogen evolution reaction

Fig. 1

a Schematic illustration of the synthesis of W-SAs, W-ACs and WC NPs at H2/Ar atmosphere (1 bar), where W atoms, carbide carbon, and graphitic carbon is represented by blue, gray, and black spheres, respectively. Typical HAADF-STEM images of (b) W-SAs, e W-ACs, h WC NPs. c Enlarged STEM image of W-SAs, inset shows the intensity profile along the tungsten atoms indicated by the yellow solid circle. d Statistical analysis of the lateral dimension of atomically dispersed tungsten atoms in (b) and Supplementary Fig. 4c. f Enlarged STEM image of W-ACs, with the W-W structures indicated by the yellow dashed circles. g STEM-EDS mapping of W-ACs showing the homogeneous distribution of C (green), N (deep blue), O (red), P (yellow) and W (cyan) elements. i High-magnification HAADF-STEM image of a WC NP showing the (100) facet with lattice fringe spacing of 0.25 nm. j Statistical analysis of the lateral dimension of WC NPs in (h) and Supplementary Figs. 5b, 7c.

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