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). The
3D network of the nanofibrous aerogel can survive well even after