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Issue 20, 2020
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Ultrastable conductive microporous covalent triazine frameworks based on pyrene moieties provide high-performance CO2 uptake and supercapacitance

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Abstract

Covalent organic triazine frameworks (CTFs) are a subclass of covalent organic frameworks and conjugated microporous polymers that exhibit heteroatom effects and possess high surface areas and excellent chemical and thermal stabilities; they have applications in energy storage and gas adsorption. In this study, we prepared two microporous polymers the pyrene-functionalized CTFs Pyrene-CTF-10 and Pyrene-CTF-20—through ionothermal treatment of 1,3,6,8-cyanopyrene (TCNPy) in the presence of molten zinc chloride (ZnCl2) at 500 °C (at ZnCl2-to-TCNPy molar ratios of 10 : 1 and 20 : 1, respectively). Pyrene-CTF-10 and Pyrene-CTF-20 had specific BET surface areas of 819 and 1019 m2 g−1, respectively, with pore size distributions of 1.10 and 1.35 nm, respectively, and high char yields (up to 70%). Furthermore, these Pyrene-CTF polymeric frameworks exhibited excellent specific capacitances at a current density of 0.5 A g−1: 380 F g−1 for Pyrene-CTF-10 and 500 F g−1 for Pyrene-CTF-20. In addition, both Pyrene-CTFs had excellent cycling stability, retaining 97% of their capacitances after cycling 2000 times at a current density of 10 A g−1. Moreover, Pyrene-CTF-10 displayed good CO2 uptake capacity (2.82 and 5.10 mmol g−1 at 298 and 273 K, respectively).

Graphical abstract: Ultrastable conductive microporous covalent triazine frameworks based on pyrene moieties provide high-performance CO2 uptake and supercapacitance

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Supplementary files

Article information


Submitted
15 Mar 2020
Accepted
30 Apr 2020
First published
01 May 2020

New J. Chem., 2020,44, 8241-8253
Article type
Paper

Ultrastable conductive microporous covalent triazine frameworks based on pyrene moieties provide high-performance CO2 uptake and supercapacitance

M. G. Mohamed, A. F. M. EL-Mahdy, Y. Takashi and S. Kuo, New J. Chem., 2020, 44, 8241
DOI: 10.1039/D0NJ01292K

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