Abstract
Herein, we employed the lignin as sustainable carbon precursor with polyacrylonitrile (PAN) to synthesize the carbon nanofibers (CNFs), and coated the polyaniline (PANI) to acquire the high N-doped CNFs. The as-obtained lignin-derived nitrogen-doped polyacrylonitrile/polyaniline carbon nanofibers (LCNFs/PANI/N-9) displayed excellent properties, such as the large specific surface areas of 483.1 m2 g−1, uniform pore size distributions of 9.1 nm, high graphitic structure, and high nitrogen doping content of 6.31 wt%. The uniform diameter of CNFs could allow a short ion diffusion path with efficient electron transport. And the highest specific capacitance of the LCNFs/PANI/N-9 increased to 199.5 F g−1 at 1 A g−1. Besides, the N-doped CNFs presented excellent cycling stability with 82% capacitance retention after 1000 charge-discharge cycles at the current density of 4 A g−1. This research opened the new promising of high-value applications for inexpensive and renewable biomass.
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