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. 2020 Aug 10;142(36):15386–15395. doi: 10.1021/jacs.0c06329

Figure 5.

Figure 5

(a) A truncated molecular model of PCN-226. Color code: brown, Co; blue, N; gray, C; white, H. We varied the distance between the two porphyrin motifs to investigate the effect of the spacing on ORR. (b) Adsorption free energy of ORR intermediates as a function of the spacing. The two inherent spacings in PCN-226 are ca. 4 and 7 Å. The horizontal dashed lines indicate ΔG of an ideal catalyst. (c) Free energy diagram for the 7 Å spacing between porphyrin motifs (red) as compared to the ideal catalyst (black).