Nitrogen‐doped hierarchical few‐layered porous carbon for efficient electrochemical energy storage
Nitrogen‐doped hierarchical few‐layered porous carbon for efficient electrochemical energy storage
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用于高效电化学储能的氮掺杂多级少层多孔碳
DOI：
10.1002/cey2.78
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发表时间：
2020-09
期刊：
影响因子：
20.5
通讯作者：
Fuqiang Huang
中科院分区：
文献类型：
--
作者：
Peng Wang;Xiaohuan Qi;Wei Zhao;Meng Qian;Hui Bi;Fuqiang Huang
碳电极材料的大表面积、高导电性和丰富的活性位点是储能装置的必要特性。然而，碳电极材料的高导电性和高氮掺杂很难协调。本文提出了一种简单的方法，通过碳化含氮希夫碱聚合物来制备高导电性和高氮掺杂的分层多孔碳。聚合物中具有苯环结构的有机组分促进了更多sp2‐石墨化碳的形成，有利于提高导电性能。掺氮层次化多孔碳在900℃nh3气氛下煅烧，含氮量高达7.48 at%，比表面积高达1613.2 m2/g，电导率高达2.7 S/cm。作为水基超级电容器的电极材料，氮掺杂分层多孔碳在1 A/g电流密度下具有385 F/g的优越比电容，以及优异的倍率性能（分别在100和200 A/g电流密度下为242和215 F/g）。此外，在双电极系统中测量到的电极比电容在1 a /g时为335 F/g，并且在10,000次循环后可以实现超过94%的初始电容的长期循环稳定性。所构建的对称超级电容器具有高能量密度和高功率密度。优异的电化学性能与新颖的可扩展合成方法相结合，使氮掺杂分层多孔碳电位电极材料成为电化学器件的首选材料。
Large surface area, high conductivity, and rich active site of carbon electrode materials are necessary characteristics for energy storage devices. However, high conductivity and high nitrogen doping of carbon electrode materials are difficult to coordinate. Here, a facile method via the carbonization of nitrogen‐containing Schiff base polymer has been developed to prepare high conductivity and high nitrogen‐doped hierarchical porous carbon. The organic components with a benzene ring structure in the polymer promote the formation of more sp2‐graphitized carbon, which is beneficial for the improvement of electrical conductivity. Nitrogen‐doped hierarchical porous carbon calcined at 900°C under the NH3atmosphere possesses high nitrogen content of 7.48 at%, a large specific surface area of 1613.2 m2/g, and high electrical conductivity of 2.7 S/cm. As electrode materials in an aqueous‐based supercapacitor, nitrogen‐doped hierarchical porous carbon exhibits superior specific capacitance of 385 F/g at 1 A/g as well as excellent rate performance (242 and 215 F/g at a current density of 100 and 200 A/g, respectively). In addition, the specific capacitance of electrode measured in a two‐electrode system is 335 F/g at 1 A/g, and the long‐term cycling stability can be achieved with more than 94% initial capacitance after 10 000 cycles. The constructed symmetric supercapacitor delivers high energy density and high power density. The outstanding electrochemical performances combined with the novel and scalable synthetic approach make the nitrogen‐doped hierarchical porous carbon potential electrode material for electrochemical devices.
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影响因子：
6.6
作者：
Wei, Huanming;Chen, Haijun;Han, Sheng
通讯作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1002/cey2.22
发表时间：
2019-11
期刊：
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影响因子：
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作者：
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