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Micropore‐Rich Yolk‐Shell N‐doped Carbon Spheres: An Ideal Electrode Material for High‐Energy Capacitive Energy Storage
Author(s) -
Li Xinyuan,
Liu Zhenhui,
Cai Congcong,
Yu Qiang,
Jin Wenting,
Xu Ming,
Yu Chang,
Li Shidong,
Zhou Liang,
Mai Liqiang
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100113
Subject(s) - ionic liquid , microporous material , energy storage , chemical engineering , materials science , capacitance , electrochemistry , supercapacitor , carbon fibers , nanotechnology , capacitive deionization , porosity , capacitive sensing , doping , electrode , chemistry , organic chemistry , composite material , optoelectronics , catalysis , thermodynamics , composite number , engineering , computer science , operating system , power (physics) , physics
Increasing the energy density of electrochemical double layer capacitors (EDLCs) can broaden their applications in energy storage but remains a formidable challenge. Herein, micropore‐rich yolk‐shell structured N‐doped carbon spheres (YSNCSs) were constructed by a one‐pot surfactant‐free self‐assembly method in aqueous solution. The resultant YSNCSs after activation possessed an ultrahigh surface area of 2536 m 2 g −1 , among which 80 % was contributed from micropores. When applied in EDLCs, the activated YSNCSs demonstrated an unprecedentedly high capacitance (270 F g −1 at 1 A g −1 ) in 1‐ethyl‐3‐methylimidazolium tetrafluoroborate ([EMIM][BF 4 ]) ionic liquid, affording an ultrahigh energy density (133 Wh kg −1 at 943 W kg −1 ). The present contribution provides insight into engineering porous carbons for capacitive energy storage.