Fig. 2From: Fe, N, S-codoped carbon frameworks derived from nanocrystal superlattices towards enhanced oxygen reduction activitya SAXS pattern of highly ordered Fe–N–S/CFs and the enlarged region between 0.75 and 2.25 nm−1 (insert). b XRD pattern and c Raman spectrum of Fe–N–S/CFs. d Representative Cs-corrected HAADF-STEM image of Fe–N–S/CFs (the bright spots, assigned to Fe atoms, are circled in the image)Back to article page