Synthesis of carbon frameworks with N, O and S-lined pores from gallic acid and thiourea for superior CO2 adsorption and supercapacitors

“C 2 N”-species have emerged as a promising material with carbon-like applications in sorption, gas separation and energy storage, while with much higher polarity and functionality. Controlled synthesis of “C 2 N” structure is still based on complex and less-sustainable monomers, which prohibits its...

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Veröffentlicht in:Science China materials 2020-05, Vol.63 (5), p.748-757
Hauptverfasser: Tian, Zhihong, Lai, Feili, Heil, Tobias, Cao, Shaokui, Antonietti, Markus
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Sprache:eng
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Zusammenfassung:“C 2 N”-species have emerged as a promising material with carbon-like applications in sorption, gas separation and energy storage, while with much higher polarity and functionality. Controlled synthesis of “C 2 N” structure is still based on complex and less-sustainable monomers, which prohibits its broader industrial application. Here we report a class of well-defined C 2 (N x O y S z ) 1 carbons with both high content of N/O/S heteroatoms and large specific surface area of up to 1704 m 2 g −1 , which can be efficiently synthesized through a simple additive condensation process using simple gallic acid and thiourea as the building blocks, without sub-tractive activation. This 1,4-para tri-doped C 2 (N x O y S z ) 1 structure leads to sufficient CO 2 adsorption capacity (3.0 mmol g −1 at 273 K, 1 bar) and a high CO 2 /N 2 selectivity (47.5 for a 0.15/0.85 CO 2 /N 2 mixture at 273 K). Related to the polarity, the polar frameworks can be used as supercapacitor electrodes, with record specific capacitances as high as 255 F g −1 at 3.5 V for a symmetric supercapacitor in ionic liquid electrolyte. This work discloses a general way for preparing a novel family of multifunctional, high heteroatom-doped porous materials for various applications.
ISSN:2095-8226
2199-4501
DOI:10.1007/s40843-019-1254-9