Mangisetti Sandhya Rani, Pari Baraneedharan, M Kamaraj, Ramaprabhu Sundara
Alternative Energy and Nanotechnology Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.
ChemSusChem. 2018 May 25;11(10):1664-1677. doi: 10.1002/cssc.201800147. Epub 2018 Apr 25.
The preparation of highly conductive, high-surface-area, heteroatom-doped, porous carbon nanocomposite materials with enhanced electrochemical performance for sustainable energy-storage technologies, such as supercapacitors, is challenging. Herein, a route for the large-scale synthesis of nitrogen-doped porous carbon wrapped partially exfoliated carbon nanotubes (N-PPECNTs) with an interconnected hierarchical porous structure, as an advanced electrode material that can realize several potential applications for energy storage, is presented. Polypyrrole conductive polymer acts as both nitrogen and carbon sources that contribute to the pseudocapacitance. Partially exfoliated carbon nanotubes (PECNTs) provide a high specific surface area for ion and charge transportation and act as a conductive matrix. The derived porous N-PPECNT displays a nitrogen content of 6.95 at %, with a specific surface area of 2050 m g , and pore volume of 1.13 cm g . N-PPECNTs, as an electrode material for supercapacitors, exhibit an excellent specific capacitance of 781 F g at 2 A g , with a high cycling stability of 95.3 % over 10 000 cycles. Furthermore, the symmetric supercapacitor exhibits remarkable energy densities as high as 172.8, 62.7, and 53.55 Wh kg in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([BMIM][TFSI]), organic, and aqueous electrolytes, respectively. Also, biocompatible hydrogel and polymer gel electrolyte based, stable, flexible supercapacitors with excellent electrochemical performance could be demonstrated.
制备具有高导电性、高比表面积、杂原子掺杂且具有增强电化学性能的多孔碳纳米复合材料，用于超级电容器等可持续储能技术，具有挑战性。在此，我们提出了一种大规模合成氮掺杂多孔碳包裹部分剥离碳纳米管（N-PPECNTs）的方法，该材料具有相互连接的分级多孔结构，是一种先进的电极材料，可实现多种潜在的储能应用。聚吡咯导电聚合物作为氮源和碳源，有助于赝电容的形成。部分剥离的碳纳米管（PECNTs）为离子和电荷传输提供了高比表面积，并作为导电基体。所得的多孔N-PPECNT的氮含量为6.95 at%，比表面积为2050 m²/g，孔体积为1.13 cm³/g。N-PPECNTs作为超级电容器的电极材料，在2 A/g电流密度下表现出781 F/g的优异比电容，在10000次循环中具有95.3%的高循环稳定性。此外，对称超级电容器在1-丁基-3-甲基咪唑双（三氟甲磺酰）亚胺（[BMIM][TFSI]）、有机和水性电解质中分别表现出高达172.8、62.7和53.55 Wh/kg的显著能量密度。此外，还可以展示基于生物相容性水凝胶和聚合物凝胶电解质的、具有优异电化学性能的稳定、柔性超级电容器。
