Fig. 2
Morphology and elemental mapping of various photocatalysts. TEM images of a, b TiO2-G and c, d HCP-TiO2-FG at different magnification. The insets in b and d are the corresponding HR-TEM images. e STEM image of HCP-TiO2-FG. f–i High-angle annular dark field (HAADF) mapping images of HCP-TiO2-FG. The scale bar are 200 nm in a, 50 nm in b, 0.5 μm in c, 100 nm in d, 100 nm in e, and 5 nm in insets in b and d
