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a) The formation of Co NPs–N/C (top) and Co SAs/N–C (bottom); b) TEM images of Co SAs/N–C(800); c) Examination of the corresponding EELS mapping reveals the homogeneous distribution of Co and N on the carbon support; d,e) Magnified HAADF–STEM images of Co SAs/N–C(800), showing that only Co single atoms are present in Co SAs/N–C. Reproduced with permission.176
