Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
Department of Chemistry, Incheon National University , Incheon 406772, South Korea.
ACS Appl Mater Interfaces. 2016 Aug 17;8(32):20741-7. doi: 10.1021/acsami.6b05601. Epub 2016 Aug 4.
The commercialized aluminum electrolytic capacitors (AECs) currently used for alternating current (AC) line-filtering are usually the largest components in the electronic circuits because of their low specific capacitances and bulky sizes. Herein, nitrogen-doped holey graphene (NHG) films were prepared by thermal annealing the composite films of polyvinylpyrrolidone (PVP), graphene oxide (GO), and ferric oxide (Fe2O3) nanorods followed by chemical etching with hydrochloride acid. The typical electrochemical capacitor with NHG electrodes exhibited high areal and volumetric specific capacitances of 478 μF cm(-2) and 1.2 F cm(-3) at 120 Hz, ultrafast frequency response with a phase angle of -81.2° and a resistor-capacitor time constant of 203 μs at 120 Hz, as well as excellent cycling stability. Thus, it is promising to replace conventional AEC for AC line-filtering in miniaturized electronics.
商业化的用于交流（AC）线路滤波的铝电解电容器（AEC）通常因其低比电容和庞大的尺寸而成为电子电路中最大的元件。在此，通过对聚维酮（PVP）、氧化石墨烯（GO）和氧化铁（Fe2O3）纳米棒的复合薄膜进行热退火，然后用盐酸进行化学刻蚀，制备了氮掺杂多孔石墨烯（NHG）薄膜。具有 NHG 电极的典型电化学电容器在 120 Hz 时表现出高达 478 μF cm(-2)和 1.2 F cm(-3)的面和体比电容，在 120 Hz 时具有超快的频率响应，相位角为-81.2°，电阻-电容时间常数为 203 μs，以及出色的循环稳定性。因此，有望取代传统的用于小型化电子设备中交流线路滤波的 AEC。
