Journal
RSC ADVANCES
Volume 6, Issue 62, Pages S7464-S7472Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra08428a
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Funding
- National Natural Science Foundation of China [21471114]
- State Major Research Plan (973) of China [2011CB932404]
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Heteroatom self-doped porous carbon materials were synthesized for the first time via freeze drying technique, followed by carbonization of brussel sprouts under a nitrogen atmosphere. The resultant materials were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) measurements. Brussel sprouts carbonized at 800 degrees C exhibit superior capacitive performance, including specific capacitance of 255 F g(-1) at a current density of 0.5 A g(-1), high rate capability (83% capacitance retention from 0.5 A g(-1) to 50 A g(-1)), and good cycle life (99.5% maintained over 5000 cycles). The highly stable electrochemical performance could be due to the hierarchical porous structure combined with the high specific surface area and heteroatom doping efforts.
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