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. 2023 Oct 20;15:232. doi: 10.1007/s40820-023-01195-2

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Fig. 2 — a XRD of the Fe/Co-CTs/NC and Fe/Co-NPs/NC. b–d High-resolution N 1 s (b), Co 2p3/2 (c) and Fe 2p3/2 (d) XPS data of as-prepared samples. e The percentage content of four N types relative to total N in the Fe/Co-CTs/NC sample. f Schematic model of M–N–C sites decorated by nanoclusters. Co nanoclusters (pink), Fe (red), Co (pink), N (blue), and C (gray)