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. 2022 Nov 2;8(44):eadd8873. doi: 10.1126/sciadv.add8873

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Fig. 2. — (A) Ar absorption/desorption isotherm and (B) the corresponding micropores (<2 nm) and external surface area (>2 nm) fraction of six Fe/N/C catalysts prepared using different synthetic conditions (t-plot method). (C) The responses of the six Fe/N/C catalysts toward different-sized organics evaluated by the relative current density at 0.8 ViR_-free. (D) ORR activity contribution from different-sized porosity for the six Fe/N/C catalysts.