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 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
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. |
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ISSN: | 2095-8226 2199-4501 |
DOI: | 10.1007/s40843-019-1254-9 |