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. 2023 Jul 5;9(27):eadh2885. doi: 10.1126/sciadv.adh2885

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Fig. 5. — (A) Co L-edge XAS of P-CoSe₂ and different S-doped M-CoSe₂. (B) Temperature-dependent susceptibilities for P-CoSe₂ and different S-doped M-CoSe₂. Inset shows the corresponding unpaired d electron number. (C) Volcano relationship between the HER activity and the unpaired d-electron number of different catalysts. (D and E) Crystal structures (D) and schematic energy band diagrams (E) of the P-CoSe₂ (left), M-CoSe_1.28S_0.72 (middle), and M-CoSe_1.03S_0.97 (right) catalysts. (F) Schematic illustration of the electronic coupling between H and Co in P-CoSe₂ (left), M-CoSe_1.28S_0.72 (middle), and M-CoSe_1.03S_0.97 (right) during Volmer reaction.