Facile and green synthesis of biomass-derived N, O-doped hierarchical porous carbons for high-performance supercapacitor application
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS(2024)
Abstract
The development of superior electrode materials using biomass as sustainable carbon sources is of great significance in promoting the practical application of supercapacitors. Herein, we prepared a N, O co-doped hierarchical porous carbon (GPC-0.9 N) with an ultra-high specific surface area of 2808.65 m2 g-1 and abundant microporous, mesoporous and macroporous structures through the straightforward pre-carbonization method using garlic peels combined with KHCO3/melamine activation. Additionally, the relatively high nitrogen (3.81%) and oxygen content (4.79%) can enhance the wettability of the carbon materials and introduce additional pseudocapacitance. As a result, the electrode material achieved a high specific capacitance of 396.25 F g-1 at 1 A g-1 and outstanding rate capability of 283.13 F g-1 at 25 A g-1 in 6 M KOH electrolyte in a three-electrode system. Meanwhile, the symmetrical supercapacitor based on the GPC-0.9 N electrode material showed a high energy density of 9.07 Wh kg-1 at the power density of 309.2 W kg-1. Furthermore, it exhibited excellent cycling stability, with 92.5% of the capacitance retained after 10000 cycles at 10 A g-1. This research provides insights for the rational design of a green, renewable and eco-friendly biomass-derived porous carbon that can be widely used as supercapacitor electrode materials in the future.
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Key words
Supercapacitors,Garlic peels,O co-doped,Hierarchical porous carbon
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