Porous 3D Honeycomb Structure Biomass Carbon as a Supercapacitor Electrode Material to Achieve Efficient Energy Storage

Advanced carbon materials with high specific surface area (SSA), porous structure, and good conductivity are the key factors to obtaining efficient energy storage and conversion devices. Here, a simple gas-phase cycle reaction was used to prepare a carbon material with 3D honeycomb structure derived from seaweed powder. The as-obtained carbon material (CS-2) exhibited excellent SSA (1206.97 m2 g–1) and good surface wetting properties. In particular, the CS-2 material exhibits very high specific capacitance (448.3 F g–1) and stable cycle life (∼91.39% capacitance retention after 3000 cycles) due to the special porous structure on its surface. To test the applicability of the material in practice, CS-2 was assembled into a simple symmetrical supercapacitor (SC), which achieved a maximum energy density of 3.125 W h kg–1. The above performance analysis indicates that the carbon material based on seaweed powder can be efficiently used as an electrode material for SCs.