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Tuning Nitrogen Species in Two‐Dimensional Carbon through Pore Structure Change for High Supercapacitor Performance
Author(s) -
Liu Hao,
Tang Qian Fang,
Qiu Zhi Guo,
Chen Xiang Ying,
Zhang Zhong Jie
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.201901336
Subject(s) - supercapacitor , electrolyte , carbon fibers , materials science , acetonitrile , tetrafluoroborate , chemical engineering , energy storage , capacitance , ionic liquid , nitrogen , electrode , inorganic chemistry , chemistry , organic chemistry , catalysis , composite material , thermodynamics , power (physics) , physics , composite number , engineering
Carbonaceous materials have long been a key component of supercapacitor energy storage systems, and exploring nitrogen atom doping and its role is currently the focus of carbon‐based electrode development. However, achieving a high proportion of pyridinic N (active N) in N‐doped carbon is still a big challenge. Here, by introducing a triblock copolymer F127 into the phenolic resin, the pore structure of the two‐dimensional carbon material is successfully adjusted, thereby increasing the probability of generation of active nitrogen. We found that this two‐dimensional porous structure is beneficial to the formation of pyridinic N. Through the change of pore structure, the ratio of pyridinic N to the total N was further increased by 13.9 %. Therefore, it provides a large specific capacitance (220 F g −1 ), excellent cycle stability (93.6 %) and high rate performance (71.2 %) in the alkaline KOH electrolyte. To further increase the energy density, we constructed an symmetrical supercapacitor device using an ionic liquid electrolyte (equal amount of 1‐ethyl‐3‐methylimidazolium tetrafluoroborate and acetonitrile). As a result, since the electrolyte has a voltage window of up to 3 V, the energy density is as high as 37.5 Wh kg −1 . This superior performance indicates that adjusting the ratio of pyridinic N provides a promising method for preparing excellent N‐doped carbon materials for energy storage systems.