首页|Biomass-derived S, P, Cl tri-doped porous carbon for high-performance supercapacitor
Biomass-derived S, P, Cl tri-doped porous carbon for high-performance supercapacitor
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NSTL
Elsevier
? 2022 Elsevier B.V.High-performance porous carbon materials have always received much interest for supercapacitors due to their excellent cycling stability, superior conductivity, etc. Herein, sulfur, phosphorous and chlorine tri-doped hierarchically porous carbon (SPC) were prepared by simply co-activating using KOH and Na2S with wheat bran as precursor. Na2S can not only improve the specific surface area (1310.3 m2 g?1 to 1585.5 m2 g?1) and pore volume (0.767 cm3 g?1 to 0.977 cm3 g?1), but also introduce sulfur atoms to contribute extra pseudocapacitance. Benefitting from the heteroatom doping and surface structure optimizing, the as-prepared SPC exhibits a large specific capacitance of 488 F g?1 (at 1 A g?1), superior to the porous carbon that was only activated by KOH (245 F g?1 at 1 A g?1), and still remains 51.6% of the initial specific capacitance at 20 A g?1.The supercapacitor assembled by SPC delivers a high energy density of 12.5 Wh kg?1 (at 250 W kg?1). After charge-discharge for 9000 cycles (at 10 A g?1), the capacitance can still remain 96% of the initial value, showing that SPC is a promising candidate for high-performance supercapacitor.
NSTL
Elsevier
