N-doped mesoporous carbon by a hard-template strategy associated with chemical activation and its enhanced supercapacitance performance
N-doped mesoporous carbon by a hard-template strategy associated with chemical activation and its enhanced supercapacitance performance
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DOI：
10.1016/j.electacta.2017.04.034
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发表时间：
2017-06-01
影响因子：
6.6
通讯作者：
Xi, Fengna
中科院分区：
文献类型：
--
作者：
Chen, Mingfeng;Xuan, Huaqing;Xi, Fengna
对于作为电化学电极材料的多孔炭来说，良好的介孔控制是非常重要的。然而，采用模板法制备的有序介孔炭存在比表面积相对较低的问题。在本文中，我们采用了一种与化学活化相关的硬模板路线，通过将碳和氮的前驱体共浇铸到介孔二氧化硅的孔道中来制备氮掺杂介孔碳。得到的活性氮掺杂介孔碳(ANMC)材料保留了模板的形貌和介孔结构，同时通过KOH活化引入了二次介孔。结果表明，该样品以中孔为主，具有较高的中孔比表面积(2505.6 m(2)g-1)和中孔体积(1 74 cm(3)g-1)。确定了N掺杂为吡啶-N、吡咯-N、季铵-N和吡啶-N-氧化物，它们不仅贡献了假电势，而且促进了碳骨架中的电子转移。发达的介孔结构和N掺杂使该材料表现出优异的电化学性能，远远高于有序介孔碳、N掺杂有序介孔碳和活性N掺杂碳样品。比电容336.9 Fg(-1)(0.5Ag(-1))和倍率能力高于其他报道的中孔炭。此外，组装的对称型超级电容器同时表现出高的能量密度和功率密度，以及出色的循环能力(类似于5000次后保持98.5%的容量)。(C)2017爱思唯尔有限公司。保留所有权利。
Well-controlled mesoporosity is of importance for porous carbons as electrochemical electrode materials. However, the ordered mesoporous carbons prepared from the template approaches face the fact of relative low specific surface area in comparison to activated carbons. Herein, we employed a hard-template route associated with the chemical activation to prepare N-doped mesoporous carbon by cocasting of carbon and nitrogen precursors into the pore channels of mesoporous silica. The obtained activated N-doped mesoporous carbon (ANMC) material preserved the morphology and mesoporous structure of template, and meanwhile a secondary mesoporosity was introduced by the KOH activation. It was demonstrated that the dominant porosity in ANMC sample was from mesopore, and it possessed a high mesopore surface area (2505.6 m(2) g(-1)) and mesopore volume (1.74 cm(3) g(-1)). The N dopant was determined to be pyridinic-N, pyrrolic-N, quaternary-N and pyridine-N-oxide, which did not only contribute the pseudocapaticance but also facilitated the electron transfer in the carbon skeleton. The developed mesoporosity and N doping made this material exhibit superior electrochemical performance that was much higher than those of ordered mesoporous carbon, N-doped ordered mesoporous carbon and activated N-doped carbon samples. Also, the specific capacitance 336.9 F g(-1) (0.5 A g(-1)) and the rate capability were higher than those of other reported mesoporous carbons. In addition, the assembled symmetrical supercapaictor simultaneously showed the high energy density and power density, as well as presented the superb cycling ability (similar to 98.5% capacitance retaining after 5000 runs). (C) 2017 Elsevier Ltd. All rights reserved.