Three-Dimensional Hierarchically Porous All-Carbon Foams for Supercapacitor

Abstract

Three-dimensional hierarchically porous carbon-CNT-graphene ternary all-carbon foams (3D-HPCFs) with 3D macro- and mesoporous structures, a high specific surface area (1286 m(2) g(-1)), large bimodal mesopores (5.1 and 2.7 nm), and excellent conductivity have been fabricated through multicomponent surface self-assembly of graphene oxide (GO)-dispersed pristine CNTs (GOCs) supported on a commercial sponge. The commercial sponge with a 3D interconnected macroporous framework not only is used as a support for GOCs and subsequently multicomponent self-assembly but also serves as a 3D scaffold to buffer electrolytes to reduce ion transport resistance and ion diffusion distance, while the GO acts as "surfactant" to directly disperse pristine CNTs, preserving the excellent electronic structure of pristine CNTs, and the CNTs also prevent the aggregation of graphene as well as improve the whole conductivity. Benefiting from the aforementioned characteristics, the 3D-HPCFs-based supercapacitors show outstanding specific capacitance, high rate capability, and excellent cycling stability, making them potentially promising for high-performance energy storage devices.

Porous Carbon Nanosheets Prepared from Plastic Wastes for Supercapacitors

“…5 Porous carbon with specific morphology and heteroatomic doping have been used as effective electrode materials for supercapacitors due to their large surface area, tunable size, high chemical and physical stability, good conductivity and low cost. [5][6][7][8] Waste plastics, including polypropylene (PP), polystyrene (PS), polyethylene (PE), polyvinyl chlorine (PVC), polyethylene terephthalate (PET) and low density polyethylene (LDPE), have aroused the attention of an increasing number of researchers due to their high carbon content. 9,10 It will mean great progress when we are able to turn the waste plastics into high-value carbon materials in terms of effective utilization of waste resources.…”

Hierarchical Configuration of NiCo2S4 Nanotube@Ni–Mn Layered Double Hydroxide Arrays/Three-Dimensional Graphene Sponge as Electrode Materials for High-Capacitance Supercapacitors

“…[27][28][29] For example, MnO 2 /Mn/MnO 2 sandwich-like nanotube (the metal Mn layers as conducting cores) arrays have 955 F g −1 at 1.5 A g −1 . 30 A Ni 3 S 2 @Ni(OH) 2 /3D graphene electrode, the Ni 3 S 2 nanorods as both active material and charge transfer core, exhibits high Csp of 1037.5 F g -1 at 5.1 A g -1 .…”

Preparation of Nitrogen and Sulfur dual-doped Mesoporous Carbon for Supercapacitor Electrodes with Long Cycle Stability

“…For obtaining the high electrochemical performance, mesoporous carbon has been strongly recommended for SCs as electrode materials [10,12,13]. The mesoporous carbon, especially with 3D configurations, can buffer electrolytes to reduce ion transport resistance and ion diffusion distance for high-rate SCs applications, and the large accessible specific surface area of mesoporous can also enhance the charge storage [14,15]. Benefiting from the aforementioned characteristics, the specific capacitance of mesoporous carbon could reach 100-290 F/g even in aqueous electrolytes [16][17][18].…”