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A carbonized porous aromatic framework to achieve customized nitrogen atoms for enhanced supercapacitor performance

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Abstract

In this study, a porous aromatic framework (PAF) material (LNU-18) with two kinds of nitrogen atoms (Ntriazine and Namine) was prepared via a Suzuki coupling reaction. After carbonization at 700, 800, and 900 °C, there is no obvious change in the morphology of the samples compared with their precursor accompanied by an enlargement in the surface area. Evaluated in an alkali environment (6 M KOH), LNU-18-800 as the electrode material reached a maximum specific capacitance of 269 F g−1 at a current density of 0.5 A g−1. To reveal their excellent electrochemical properties, PAF-48, with a similar theoretical structure to LNU-18 but with the whole carbon skeleton being carbonized, shows a capacitance of 54 F g−1, which is ca. four times lower than that of LNU-18-800. This is because the strong covalent bonds in the porous aromatic framework will maintain the chemical structure of N atoms, and the customized nitrogen atoms (Ntriazine and Namine) in porous carbons enhance the capability to function as high-performance supercapacitors. This study demonstrates that porous aromatic frameworks as precursors will generate the special N atoms for further investigation of porous carbon electrodes.

Graphical abstract: A carbonized porous aromatic framework to achieve customized nitrogen atoms for enhanced supercapacitor performance

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Publication details

The article was received on 03 Aug 2019, accepted on 17 Oct 2019 and first published on 22 Oct 2019


Article type: Paper
DOI: 10.1039/C9NJ04038B
New J. Chem., 2019, Advance Article

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    A carbonized porous aromatic framework to achieve customized nitrogen atoms for enhanced supercapacitor performance

    Y. Zhao, N. Bu, H. Shao, Q. Zhang, B. Feng, Y. Xu, G. Zheng, Y. Yuan, Z. Yan and L. Xia, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ04038B

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