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Microporous Organic Polymer‐Derived Nitrogen‐Doped Porous Carbon Spheres for Efficient Capacitive Energy Storage
Author(s) -
Deka Namrata,
Barman Jayshree,
Deka Jumi,
Raidongia Kalyan,
Dutta Gitish K.
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900825
Subject(s) - supercapacitor , microporous material , materials science , heteroatom , capacitance , chemical engineering , electrolyte , carbon fibers , polymer , aqueous solution , porosity , energy storage , specific surface area , nitrogen , nanotechnology , electrode , chemistry , organic chemistry , composite material , catalysis , power (physics) , physics , quantum mechanics , composite number , engineering , ring (chemistry)
A facile and template‐free synthetic approach was utilized to obtain a series of nitrogen and oxygen‐doped microporous carbon spheres (CTS‐X‐700) from carbazole‐terephthalaldehyde based co‐polymer spheres (CTS). The inherent spherical morphology of the co‐polymer remained intact even after activation at high temperature (700 °C). The synthesized materials exhibit BET surface area of up to 1340 m 2 g −1 with an interconnected porous network consisting of ultramicropores and supermicropores along with a small amount of mesopores. Moreover, a good balance of heteroatom surface functionalities (N content up to 3.2 % and O content up to 12 %) was maintained without compromising the porosity by systematically varying the activation conditions. These features result in a high specific capacitance value of 407 F g −1 at 1.0 A g −1 in aqueous acid electrolyte with a three‐electrode system and superior cycle stability of 100 % capacitance retention even after 10000 cycles. Furthermore, the high energy density (10.6 W h kg −1 at a current density of 0.5 A g −1 ) in an aqueous electrolyte of the assembled supercapacitor device further demonstrates the possible applications of the synthesized materials as high‐performance energy storage devices.