From biological waste to honeycomb-like porous carbon for high energy density supercapacitor
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We develop a facile and sustainable method for the synthesis of three-dimensional (3D) interconnected honeycomb-like porous carbon (HPC) derived from sunflowers stem. The optimized sample has large specific surface area with 3D interconnected honeycomb-like porous structure and high oxygen content. Due to their synergistic effect, the HPC-2 material shows a high specific capacitance of 349 F g−1 at 1 A g−1, good rate capability (247 F g−1 at 50 A g−1) and excellent cycling stability (retaining 98.6% after 10000 cycles) in 6 M KOH aqueous electrolyte. Moreover, the HPC-2//HPC-2/MnO2 asymmetric supercapacitor shows a high energy density of 58.8 W h kg−1 and good electrochemical stability (83.1% of initial capacitance retention after 10000 cycles). Therefore, these unique properties enable the material to become a promising high-performance electrode material for supercapacitors.
This work was supported by National Natural Science Foundation of China (51702043) and Fundamental Research Funds for the Central Universities (2572017BB18).
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Conflict of interest
All authors listed have declared that they have no conflict of interest.
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