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Polyacrylonitrile Derived Porous Carbon for Zinc‐Ion Hybrid Capacitors with High Energy Density
Author(s) -
Fan Xiaowen,
Liu Penggao,
Ouyang Baixue,
Cai Ruizheng,
Chen Xinxin,
Liu Xicang,
Liu Weifang,
Wang Jue,
Liu Kaiyu
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100862
Subject(s) - cathode , materials science , electrochemistry , capacitor , chemical engineering , polyacrylonitrile , power density , carbon fibers , porosity , aqueous solution , supercapacitor , electrode , composite material , chemistry , composite number , organic chemistry , electrical engineering , voltage , power (physics) , polymer , physics , quantum mechanics , engineering
Aqueous zinc‐ion hybrid capacitors (ZIHCs) attract widespread attention due to their excellent electrochemical performance, safety, and low cost. Here, a honeycomb‐like porous carbon is synthesized as the cathode of ZIHCs via facile pre‐oxidation in combination with an activation process. The pre‐oxidized porous carbon (PPC) displays a larger specific surface area and faster electrochemical kinetics compared to porous carbon without pre‐oxidation (PC), realizing a superior electrochemical performance. The PPC cathode can deliver a capacity of 238 mAh g −1 at 0.1 A g −1 . Besides, the hybrid capacitors can achieve a high energy density of 193.6 Wh kg −1 at 76.6 W kg −1 and 109.5 Wh kg −1 at a maximum power density of 3981 W kg −1 . More importantly, the hybrid capacitor exhibits a good cycling stability with a capacity retention of 83 % after 20000 cycles at a high current density of 2 A g −1 . This cathode material – with an excellent electrochemical performance – could pave the way for application of ZIHCs.