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. 2022 Nov 14;14:223. doi: 10.1007/s40820-022-00962-x

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Fig. 6 — Calculated free energy diagrams of a water reduction to H₂ and b water oxidation to O₂ for BCN and Zn-PCN. c Proposed reaction mechanism of photocatalytic overall water splitting into H₂ and O₂ over Zn-PCN. The gray, blue, yellow, red and white spheres represent the C, N, Zn, O and H atoms, respectively