rGO/N-porous carbon composites for enhanced CO2 capture and energy storage performances

A novel porous carbon derived from glucose and dicyandiamide incorporated with reduced graphene oxide (rGO) was prepared for CO2 capture and supercapacitors. In this synthesis, one-pot hydrothermal and KOH activation were employed to obtain reducing graphene oxide/N-doped porous carbon (rGO/NPC) composites. Among the rGO/NPC composites derived, the sorbent rGO/NPC-600-2-1 (1 represents the addition amount of graphene oxide is 1% of the total mass of glucose and dicyandiamide, 2 represents the mass ratio of potassium hydroxide to the precursor of carbon composite material is 2 and 600 means activation temperature is 600 degrees C) had a large surface area of 865.1 m(2) g(-1), a rich nitrogen doping amount of 7.07 wt%, and a high CO2 capture ability of 5.77 mmol/g at 298 K. Additionally, the as-synthesized rGO/NPC-600-2-1 was used as a supercapacitor electrode, providing a specific capacitance 210.8 F g(-1) in 6 M KOH electrolyte under ambient conditions and excellent charge and discharge long cycle stability (circa 100% capacitance retention at a current density of 10 A g(-1) after 10000 cycles). Even at a high current density of 20 A g(-1), a capacity of 141.1 F g(-1) is still maintained. The results above suggested that the rGO/NPC composites are applicable candidates for both electrochemical energy storage and CO2 capture. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

A novel porous carbon material derived from glucose and dicyandiamide incorporated with reduced graphene oxide was prepared for CO2 capture and supercapacitors, showing great potential for both applications due to its large surface area, nitrogen doping, and high CO2 capture ability.