Nitrogen-doped hollow carbon spheres for supercapacitors
Nitrogen-doped hollow carbon spheres for supercapacitors
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用于超级电容器的氮掺杂空心碳球
DOI:
10.1007/s10853-016-0604-2
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发表时间:
2017-03
影响因子:
4.5
通讯作者:
Li Shuhui
中科院分区:
文献类型:
--
作者:
Chen Aibing;Wang Yuying;Yu Yifeng;Sun Hexu;Li Yunqian;Xia Kechan;Li Shuhui
We present high nitrogen-doped hollow carbon spheres (HNHCSs) via cooperative template-directed coating method. The SiO2spheres serve as hard template; ionic liquids, such as 1-hexadecyl-3-methylimidazolium bromide (CMMB), serve as cationic surfactant; resorcinol formaldehyde (RF) resins as carbon source; and melamine as nitrogen source. The CMMB used in the coating procedure improves the SiO2spheres dispersion in the reaction media and introduces nitrogen atom into carbon skeleton. The CMMB, SiO2spheres, and RF resins self-assemble into inorganic–organic core–shell structures through electrostatic interaction. After being treated with melamine, the nitrogen content of the sample further improved, which can enhance the performance of supercapacitor. Due to high nitrogen content, specific surface area, and unique hollow structure, the HNHCSs exhibit a reversible specific capacitance of 368 F g−1at 0.2 A g−1in 6 M KOH, and maintains a good high-class capacitance retention capability (85.1%) at 5.0 A g−1for up to 5000 cycles. These results show that the HNHCSs with high nitrogen content, specific surface area, and hollow structure represent a promising alternative of efficient electrode material for supercapacitor.
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