Electric double layer capacitors (EDLCs) are promising candidates for use in lightweight power sources because they have high power densities and excellent charge/discharge cycling stabilities. An ideal EDLC electrode should have large surface area, excellent electrical conductivity, and chemical and mechanical stability. To increase the gravimetric capacitance of an EDLC, the electrode must be self-supporting so that current collectors and nonconductive binders are not required. Three-dimensional (3D) self-supporting carbon-based materials such as graphene/carbon aerogels, carbon monoliths, carbon nanotube (CNT) sponges, and carbon nanofiber foams have been extensively studied for use in lightweight EDLCs.majorStill a major challenge for 3D carbon electrodes is the limited ion diffusion rate in their internal structures. During the rapid charging and discharging process, the limited ion diffusion causes undesirable capacitance loss and lowers the rate capability and power density. To address this limitation, the preparation of highly porous 3D structures, providing high numbers of ion diffusion channels, is favorable. The presence of macro- and mesopores facilitates ion diffusion within 3D structures, while the presence of micropores increases the gravimetric capacitance by increasing the ion-accessible surface area. 3D porous carbon materials are expected to have enhanced specific capacitances as well as rate capabilities compared to their 3D non-porous counterparts.