Abstract
Herein, nitrogen, oxygen codoped porous carbon nanofibers (CNFs) from corn residue‐derived lignin are fabricated via the electrospinning method, followed by introduction of graphenes (GNs) via a simple “brush‐coating and drying” process. The obtained GN‐coated carbon nanofibers (CNFs@GNs) exhibit a 3D network architecture, abundance of heteroatoms, excellent electrical conductivity, high specific surface area (700.92 m2 g−1), thus boosting the electrochemical performances. The CNFs@GNs electrode delivers a higher specific capacitance of 271.1 F g−1 than CNFs (200.3 F g−1) at 1 A g−1. Furthermore, the assembled CNFs@GNs symmetric supercapacitor exhibits an energy density of 20.3 Wh kg−1 at the power density of 199.97 W kg−1 together with a high charge/discharge reversibility of 97.3% and Coulombic efficiency of 99.81% after 10 000 cycles. This “brush‐coating and drying” strategy utilized here provides a convenient and efficient route for designing CNFs and GN composites and can be utilized in other active materials.
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