Scanning electron microscopy (SEM) images reveal that the
freeze-dried aerogel consists of carbonaceous nanofibers selfassembled
into a porous, interconnected, 3D framework (Fig. 1b).
High-magnification SEM and transmission electron microscopy
(TEM) observations indicate that these nanofibers with a diameter
of ca. 140 nm are highly interconnected with large numbers of junctions
(see Supplementary Information, Fig. S1 and Fig. S2).