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 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 -45º 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⁻² for the two cells. In particular, the 3V 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.

目前正在研究高频超级电容器，目的是取代笨重的电解电容器，以用于电流纹波滤波和电力系统中使用的其他功能。在此，围绕碳纳米纤维（CNF）框架生长3D边缘定向石墨烯（EOG），以形成具有大表面积的高导电性电极。此类EOG / CNF电极在水性和有机电解质中进行了高频超级电容器开发测试。对于水电池和有机电池，发现在-45º相角处的特征频率分别高达22和8.5 kHz。在120 Hz时，电极电容密度为0.37和0.16 mF cm ^-2对于两个单元格。特别是，成功将3V高频有机电池作为交流/直流转换器中使用的滤波电容器进行了测试，这表明该技术在紧凑型电源设计和其他应用中具有广阔的发展潜力。