Flute type micropores activated carbon from cotton stalk for high performance supercapacitors

Flute type micropores activated carbon (FTMAC) has been successfully obtained from cotton stalk via KOH-chemical activation method. The synthesized carbon material exhibits an ordered pore structure with high specific surface area of 1964.46 m2 g−1 and pore volume of 1.03 m3 g−1. The assembled FTMAC-based electrode delivers a high specific capacitance of 254 F g−1 at a current density of 0.2 A g−1 in 1 M H2SO4 aqueous electrolyte. It still can maintain 221 F g−1at a current density of 10 A g−1, demonstrating a good rate capacity (87% retention), as well as long cyclic stability of 96% capacitance retention after 10000 charging and discharging cycles at current density of 1 A g−1. Moreover, the symmetric supercapacitor can deliver a high energy density of 18.14 W h kg−1 and a power density of 450.37 W kg−1 which is operated in the voltage range of 0-1.8 V.