Department of Chemistry, Tsinghua University , Beijing, 100084, People's Republic of China.
Sci Rep. 2012;2:247. doi: 10.1038/srep00247. Epub 2012 Feb 3.
The recent boom in multifunction portable electronic equipments requires the development of compact and miniaturized electronic circuits with high efficiencies, low costs and long lasting time. For the operation of most line-powered electronics, alternating current (ac) line-filters are used to attenuate the leftover ac ripples on direct current (dc) voltage busses. Today, aluminum electrolytic capacitors (AECs) are widely applied for this purpose. However, they are usually the largest components in electronic circuits. Replacing AECs by more compact capacitors will have an immense impact on future electronic devices. Here, we report a double-layer capacitor based on three-dimensional (3D) interpenetrating graphene electrodes fabricated by electrochemical reduction of graphene oxide (ErGO-DLC). At 120-hertz, the ErGO-DLC exhibited a phase angle of -84 degrees, a specific capacitance of 283 microfaradays per centimeter square and a resistor-capacitor (RC) time constant of 1.35 milliseconds, making it capable of replacing AECs for the application of 120-hertz filtering.
近年来，多功能便携式电子设备蓬勃发展，这需要开发高效、低成本、长寿命的紧凑型和小型化电子电路。对于大多数市电供电的电子设备的运行，交流电（ac）线路滤波器用于衰减直流（dc）电压总线上残留的交流纹波。如今，铝电解电容器（AEC）广泛应用于这一目的。然而，它们通常是电子电路中最大的元件。用更紧凑的电容器代替 AEC 将对未来的电子设备产生巨大的影响。在这里，我们报告了一种基于三维（3D）互穿石墨烯电极的双层电容器，该电极是通过电化学还原氧化石墨烯（ErGO-DLC）制备的。在 120 赫兹时，ErGO-DLC 表现出-84 度的相位角、283 微法拉每平方厘米的比电容和 1.35 毫秒的电阻-电容（RC）时间常数，使其能够替代 AEC 用于 120 赫兹滤波应用。
