(TEM) and X-ray diffraction (XRD) analysis as shown in
Figures 2 and 3, and Figures S2 and S3 in Supporting
Information. For example, Figure 2a shows the TEM
image of as-prepared MoS2@ZIF-8 hybrid structures.
The TEM image of a curled MoS2@ZIF-8 hybrid reveals
its cross section, which shows the embedded MoS2
core and ZIF-8 shell (Figure 2b). The crystal structure of
the coating was confirmed by XRD as ZIF-8 with cubic
structure, space group I43m (Figure S2 in Supporting
Information).28 No specific orientation was observed in
the XRD pattern, indicating the polycrystalline nature
of the coated ZIF-8 shell. Note that the characteristic
XRD peak for MoS2(002) at ∼15 was not shown
because the embedded MoS2 nanosheets are too thin
(i.e., single to a few layers) to give detectable signal.27
The scanning transmission electron microscope (STEM)
image and the corresponding energy dispersive X-ray
spectrometry (EDS) elemental mapping of a typical