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Fig. 3 | Nano Convergence

Fig. 3

From: Rational coordination regulation in carbon-based single-metal-atom catalysts for electrocatalytic oxygen reduction reaction

Fig. 3

a LSV curves of N-C, Fe SAs/N-C and Pt/C catalysts in O2-saturated 0.1 M KOH. b LSV curves of Fe SAs/N-C and Pt/C catalysts in O2-saturated 0.1 M HClO4. c Schematic illustration of Fe-N switching behaviour of Fe-N4-Cx models with/without axially bound O(H)ads. Operando X-ray absorption near-edge structure (XANES) spectra of d Fe-N4 and e Co-N4 catalysts (insets: differential Δµ XANES spectra). f Durability testing of Fe-N4 catalyst at 0.85 V for 100 h. g High angle annular dark field scanning transmission electron microscopy (HAADF-STEM) image and h electron energy loss spectroscopy (EELS) analysis of Fe-N4 catalyst after the durability testing. i Schematic illustration of coordination or structural changes of Fe-N4C12 and Fe-N4C10 sites, respectively. a, b Reproduced with permission from Ref. [89]. Copyright 2019, American Chemical Society. c Reproduced with permission from Ref. [92]. Copyright 2015, American Chemical Society. d, e Reproduced with permission from Ref. [93]. Copyright 2017, Nature Publishing Group. f–h Reproduced with permission from Ref. [42]. Copyright 2019, Royal Society of Chemistry. i Reproduced with permission from Ref. [94]. Copyright 2021, Nature Publishing Group

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