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Urea‐assisted Strategy Controlling The Pore Structure And Chemical Composition Of The Porous Carbon For High‐performance Supercapacitors
Author(s) -
Wang Keke,
Chen Mingming,
Zhu Youyu,
Liu Kunlin,
Zhang Yang,
Wang Chengyang
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201903794
Subject(s) - porosity , supercapacitor , chemical engineering , materials science , aqueous solution , electrolyte , nitrogen , urea , microporous material , mesoporous material , carbon fibers , specific surface area , capacitance , chemistry , organic chemistry , composite material , composite number , electrode , catalysis , engineering
Porous carbon prepared by chemical activation with low KOH consumption always exhibits low SSA and micropore‐dominated porosity, which limits its application in non‐aqueous EDLCs. Herein, a facile strategy simultaneously combining pore structure and chemical composition controlling was developed to prepare nitrogen‐doped hierarchical porous carbon frameworks (N‐HPC) from low‐cost sulfonated pitch (SP). It was realized by utilizing the “function effect” of urea to introduce nitrogen‐containing heterocyclic units, which could enhance the “in‐suit etching” of activator to develop the porosity. Different from the sample that prepared only using KOH, the final activated sample with the help of urea not only delivers a high specific area (3054 m 2 g −1 ) with mesopore‐dominated porosity, but also exhibits a high nitrogen content of 4.2 at. %. These distinct features afford a high specific capacity of 142 F g −1 at 20 A g −1 (C 20 /C 0.05 of 79.7%), enhanced energy density 48.7 Wh kg −1 at 14.45 kW kg −1 and excellent cyclic stability (90.4% retention after 10000 cycles) in EMIMBF 4 electrolyte. Our work may provide a new insight for design of N‐HPC with low KOH consumption in energy storage fields.