Graphene‐Based Organic Electrochemical Capacitors for AC Line Filtering |
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Authors: | Fengyao Chi Chun Li Qinqin Zhou Miao Zhang Ji Chen Xiaowen Yu Gaoquan Shi |
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Institution: | Department of Chemistry, Tsinghua University, Beijing, P. R. China |
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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 V2 cm?2 with a wide workable voltage window of 2.5 V, a phase angle of ?80.5°, a resistor‐capacitor time constant (τRC) 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. |
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Keywords: | AC line‐filtering electrochemical reduction organic electrolytes ultrafast electrochemical capacitors |
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