Fig. 1. (a) Illustration of the synthetic process of NC/MoC: (I) synthesis of ZIF-8 RDs, (II) construction of MOF/MoO4 through functionalization of MOFs with molybdate, and (III) formation of NC/MoC by carbonization under a N2 atmosphere. SEM images of (b) ZIF-8 RDs, (c) MOF/MoO4-0.5, (d) pure ZIF-8 derived NC, and (e) NC/MoC-0.5. (f) TEM image of NC/MoC-0.5. (g) HRTEM image (Inset: the inverse fast Fourier transformation image) of NC/MoC-0.5. (h) HAADF-STEM and the corresponding element mapping images of NC/MoC-0.5.
