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Graphene‐Based Organic Electrochemical Capacitors for AC Line Filtering
Author(s) -
Chi Fengyao,
Li Chun,
Zhou Qinqin,
Zhang Miao,
Chen Ji,
Yu Xiaowen,
Shi Gaoquan
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700591
Subject(s) - materials science , capacitor , electrolytic capacitor , electrolyte , electrochemistry , graphene , electrode , polymer capacitor , resistor , oxide , supercapacitor , optoelectronics , voltage , nanotechnology , electrical engineering , chemistry , metallurgy , engineering
Abstract Less‐defective graphene oxide sheets with a small average size of 0.7 µm are electrochemically reduced to form a hydrogel film with highly oriented porous structure. It is applied as the electrode of organic electrochemical capacitor (OEC) after solvent change with organic electrolyte and deep reduction in this organic medium. At 120 Hz, the typical OEC exhibits a high areal specific energy density of 472 µF V 2 cm −2 with a wide workable voltage window of 2.5 V, a phase angle of −80.5°, a resistor‐capacitor time constant (τ RC ) of 0.219 ms, and an excellent electrochemical stability. Thus, it is promising to replace aluminum electrolytic capacitors for AC line filtering. Furthermore, two identical OECs connected in series keep the performance of single device, making them practically applicable in electronics.