fig4

Figure 4. (A) Topological illustration of ZIF-67 and ZIF-8^[72], reproduced from Ref.^[72] with permission. Copyright 2010 American Chemical Society. (B) Illustration of the preparation of Mn-N-C via metal nods replacement and (C) HAADF-STEM image and EDS element mapping of Mn-N-C^[73], reproduced from Ref.^[73] with permission. Copyright 2020 American Chemical Society. (D) Illustration of the preparation of ADMCs via host-guest interaction^[74], reproduced from Ref.^[74] with permission. Copyright 2020 Springer Nature. (E) Pore diameter distribution of ZIF-8 and Co(acac)₃@ZIF-8 and (F) Co K-edge XANES spectra of Co(acac)₃@ZIF-8 and Co(mIm)₄@ZIF-8^[75], reproduced from Ref.^[75] with permission. Copyright 2020 Springer Nature. (G) UV-vis spectra of the centrifuged supernatant after different washing steps and (H) Fe weight ratio in different Fc@ZIF-8 vs. the amount of Fc added during the fabrication process^[76], reproduced from Ref.^[76] with permission. Copyright 2018 Wiley-VCH. (I) Aberration-corrected HAADF-STEM images of Ru₃@ZIF-8^[77], reproduced from Ref.^[77] with permission. Copyright 2019 Wiley-VCH. (J) Illustration of the preparation of defect-coupled FeN₄ via host-guest interaction and (K) TEM and (L) aberration-corrected HAADF-STEM images of Fe SAs-N/C-20^[78], reproduced from Ref.^[78] with permission. Copyright 2018 American Chemical Society.