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. 2023 Nov 24;14:7684. doi: 10.1038/s41467-023-43328-6

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Fig. 6 — a Three in-layer adsorption sites, shown for H-PHI with two heptazine units. b Adsorption of ammonium on Na-PHI with H_ads = ‒72.48 kJ mol⁻¹ (top) and H-PHI with H_ads = ‒71.46 kJ mol⁻¹ (blue spheres represent nitrogen, gray ones sodium, black ones carbon and white ones hydrogen atoms). Source data are provided as a Source data file. c Adsorption energies of hydrogen and ammonium in Na-PHI and H-PHI with respect to the number of heptazine units. H_ads < 0 means that adsorption is a spontaneous process, while desorption in uphill. When H_ads > 0—PHI does not bind hydrogen atom, while desorption is a spontaneous process.