The TEM images of carbon monolith can clearly demonstrate the nano-scale structure, as shown in Fig. 3. The samples
pyrolyzed at different temperatures, i.e. 350, 600 and 1000 C, show well-ordered hexagonal arrays of mesopores with 1D channels, which can be well retained even after pyrolysis at 1000 C, further confirming a 2D ordered hexagonal
mesostructure [17]. 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 stablemesostructure 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.