fig4
![Two-dimensional (2D) materials for 3D printed micro-supercapacitors and micro-batteries](https://image.oaes.cc/a48a7473-ffb1-459a-bb46-8859fb8dff51/em4081.fig.4.jpg)
Figure 4. (A) Schematic illustration of 2D materials-based 3D-printed hierarchical structures; (B-i) FE-SEM images of (2D + 1D) graphene-CNTs mixed hybrid material at various magnifications (scale bar: 50 μm and 200 nm, respectively); (B-ii) TEM microstructure of graphene-CNTs mixed hybrid material with inset of schematic illustration of 2D + 1D hybrid material (scale bar: