The unit cell parameters of C-350, C-600 and C-1000 samples estimated from the TEM images are
12.6, 11.8 and 11.0 nm, respectively, indicating the highly stable mesostructure during the pyrolysis process. The HRTEM
image (Fig. 3f) of C-1000 clearly exhibits the typical amorphouscarbon structure, containing random graphitic striations
in pore walls [18]. Therefore, through extensive SEM/TEM observations, the nano-scale ordered mesopores are successfully introduced into the micro-scale 3D robust reticular skeleton by a combination of evaporation-induced selfassembly and coating strategy, resulting hierarchical macro/
mesoporous architecture.