用于高频超级电容器的碳纳米纤维上的边缘取向石墨烯

Edge-Oriented Graphene on Carbon Nanofiber for High-Frequency Supercapacitors.

作者信息

Islam Nazifah, Warzywoda Juliusz, Fan Zhaoyang

机构信息

Department of Electrical and Computer Engineering and Nano Tech Center, Texas Tech University, Lubbock, TX, 79409, USA.

Materials Characterization Center, Whitacre College of Engineering, Texas Tech University, Lubbock, TX, 79409, USA.

出版信息

Nanomicro Lett. 2018;10(1):9. doi: 10.1007/s40820-017-0162-4. Epub 2017 Oct 26.

DOI:10.1007/s40820-017-0162-4

PMID:30393658

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6199059/

Abstract

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, 3D 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 kHz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 mF cm 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 promising potential of this technology for compact power supply design and other applications.

摘要

正在对高频超级电容器进行研究，目的是取代用于电力系统中电流纹波滤波及其他功能的笨重电解电容器。在此，三维边缘取向石墨烯（EOG）环绕碳纳米纤维（CNF）框架生长，以形成具有大表面积的高导电电极。此类EOG/CNF电极在水性和有机电解质中进行了测试，以用于高频超级电容器的开发。对于水性电池和有机电池，发现-45°相角处的特征频率分别高达22 kHz和8.5 kHz。在120 Hz时，两个电池的电极电容密度分别为0.37 mF/cm²和0.16 mF/cm²。特别是，3 V高频有机电池作为AC/DC转换器中使用的滤波电容器成功进行了测试，表明该技术在紧凑型电源设计及其他应用方面具有广阔的潜在前景。