“…28 In addition, PAN is an easily available and inexpensive raw material compared to other building units to achieve carbonaceous sponges, such as fullerenes, graphene, and carbon nanotubes. [29][30][31] During the fabrication process, AlCl 3 played the most important role in creating the 3D CNFNs with robust mechanical properties and thermal insulation. 24 Owing to the thermal treatment, the AlCl 3 was converted into Al 2 O 3 .…”