Fig. 4. Electron distributions of Ti@CDV, Sc@CSV and Sc@CDV (a-c) PDOS of Ti@CDV (a), Sc@CSV (b) and Sc@CDV (c) (Gray dashed lines mark the positions of the Fermi energy levels); (d) Eb(*HCOOH) and Eb(*CO2) of Ti@CDV, Sc@CSV and Sc@CDV; The d-band center as an average of the d-band energies; Colorful figures are available on website
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