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(a) Schematic illustration of the synthetic process for heterogeneous HMOF and HMOF-templated heterogeneous ZnO–Co3O4 hierarchical composite structures. TEM images with inset of corresponding SEM image: (b) single-ZIF-L@ ZIF-67 rods, (c) double-ZIF-L@ZIF-67 rods, and (d) triple-ZIF-L@ZIF-67 rods. TEM images of (e) single-Co3O4 rods@ZnO sheet, (f) double-Co3O4 rods@ZnO sheet, and (g) triple-Co3O4 rods@ZnO sheet.
