Abstract
Sandwich-like nitrogen-enriched porous carbon/graphene composites were prepared by carbonization of polyacrylonitrile (PAN) nanofiber paper with bulk-doped and/or surface-coated graphene oxide (GO), and followed by activation with KOH at high temperatures. The composites exhibit high specific surface areas in a range of 1957.2–2631.8m2g−1, as well as superior energy storage capability as electrodes for supercapacitors. A very high specific capacitance of 381.6Fg−1 at a current density of 0.1Ag−1 was achieved in 6M KOH aqueous electrolyte for N-ACGrF@Gr1 that contains two types of graphene. According to the investigation results, the surface-coated graphene plays a more positive effect on improved supercapacitance than the bulk-doped graphene in the composites. Additionally, the assembled aqueous symmetric supercapacitors deliver a high energy density of 13.2Whkg−1 at a power density of 25.0Wkg−1, and 8.3Whkg−1 at 4.7kWkg−1 with a retention rate of 62.9%.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have