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Nano Convergence
Fig. 6 | Nano Convergence

Fig. 6

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

Fig. 6

a Structural model of Fe-pyrrolic-N4 site (Fe@pyrrolic-N) for ORR, where both Fe atom and eight-carbon atoms next to pyrrolic-N are the active centers. b Preparation process of high-purity Fe-pyrrolic-N4 structure. The balls in grey, blue and orange represent C, N and Fe atoms, respectively. c, d Calculated charge density difference of c Fe-pyrrolic-N4 and d Fe-pyridinic-N4. Yellow and blue regions represent electron accumulation and electron depletion, respectively. e Free energy diagram of ORR on Fe-pyrrolic-N4 and Fe-pyridinic-N4 sites. f LSV curves of Fe-pyrrolic-N4 (HP-FeN4), Fe-pyridinic-N4 (FeN4) and NC catalysts in O2-saturated 0.5 M H2SO4 and 20% Pt/C in 0.1 M HClO4. a Reproduced with permission from Ref. [102]. Copyright 2018, National Academy of Sciences. b–f Reproduced with permission from Ref. [103]. Copyright 2020, Royal Society of Chemistry

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