Figure 9.
Scanning electron microscope (SEM) of different materials: (a) Pt-nanograss coating [80]; (b) cauliflower-like Pt coating [87]; (c) the fabrication process of depositing porous structure on electrode surface by templating [88]; (d) 3D nanocrystal Pt coating obtained by our group; (e) nanostructured Au coating by removing Ag from the Au–Ag alloy [96]; (f) IrOx/Pt nanocone composite coating in our group [94]; (g) IrOx/Pt nanoleaf composite coating in our group [95]. Reproduced from the mentioned references with permission from the related journals.