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《Nano-Micro Letters》 2018年01期
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Edge-Oriented Graphene on Carbon Nanofiber for High-Frequency Supercapacitors

Nazifah Islam  Juliusz Warzywoda  Zhaoyang Fan  
【摘要】:High-frequency supercapacitors are being studied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3 D edge-oriented graphene(EOG)was grown encircling carbon nanofiber(CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at-45° phase angle was found to be as high as 22 and 8.5 k Hz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 m F cm~(-2) for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promisingpotential of this technology for compact power supply design and other applications.
【作者单位】Department
【基金】:supported by the National Science Foundation(1611060)
【分类号】:TM53;TQ342.742

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