Synthesis of Ultrathin Nitrogen-Doped Graphitic Carbon Nanocages as Advanced Electrode Materials for Supercapacitor
Synthesis of Ultrathin Nitrogen-Doped Graphitic Carbon Nanocages as Advanced Electrode Materials for Supercapacitor
复制标题
超级电容器先进电极材料超薄氮掺杂石墨碳纳米笼的合成
DOI：
10.1021/am400001g
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发表时间：
2013-03-27
影响因子：
9.5
通讯作者：
Yao, Shouzhuo
中科院分区：
文献类型：
--
作者：
Tan, Yueming;Xu, Chaofa;Yao, Shouzhuo
合成具有大表面积、高电导率和合适孔径分布的氮掺杂碳对于高性能超级电容器应用是高度期望的。在这里，我们报告了一种新的协议模板合成的氮掺杂的石墨碳纳米笼（CNCs）衍生自聚苯胺（PAN！）以及它们优异的电容性能。CNCs的合成包括一锅水热合成Mn3O4@PANI核壳纳米颗粒，碳化以产生碳包覆的MnO纳米颗粒，然后通过酸处理去除MnO核。在800 ℃的最佳碳化温度下制备的CNCs-800具有规则的骨架、适度的石墨化、高的比表面积、良好的介孔性和适当的N掺杂。CNCs-800在6 M KOH水溶液中显示出高的比电容（在1.0 A g（-1）下为248 F g（-1））、优异的倍率性能（在10和100 A g（-1）下分别为88%和76%的电容保持率）和出色的循环稳定性（在5000次循环后类似于95%的电容保持率）。CNCs-800在0.5M H_2SO_4水溶液中除了具有较大的电化学双电层电容外，还具有较大的赝电容。氮掺杂石墨碳纳米管具有优异的电容性能，其合成工艺简单，在超级电容器中具有广阔的应用前景。
Synthesis of nitrogen-doped carbons with large surface area, high conductivity, and suitable pore size distribution is highly desirable for high-performance supercapacitor applications. Here, we report a novel protocol for template synthesis of ultrathin nitrogen-doped graphitic carbon nanocages (CNCs) derived from polyaniline (PAN!) and their excellent capacitive properties. The synthesis of CNCs involves one-pot hydrothermal synthesis of Mn3O4@PANI core-shell nanoparticles, carbonization to produce carbon coated MnO nanoparticles, and then removal of the MnO cores by acidic treatment. The CNCs prepared at an optimum carbonization temperature of 800 degrees C (CNCs-800) have regular frameworks, moderate graphitization, high specific surface area, good mesoporosity, and appropriate N doping. The CNCs-800 show high specific capacitance (248 F g(-1) at 1.0 A g(-1)), excellent rate capability (88% and 76% capacitance retention at 10 and 100 A g(-1), respectively), and outstanding cycling stability (similar to 95% capacitance retention after 5000 cycles) in 6 M KOH aqueous solution. The CNCs-800 can also exhibit great pseudocapacitance in 0.5 M H2SO4 aqueous solution besides the large electrochemical double-layer capacitance. The excellent capacitance performance coupled with the facile synthesis of ultrathin nitrogen-doped graphitic CNCs indicates their great application potential in supercapacitors.