The rapid development of portable electronics requires miniaturized and flexible electrochemical capacitors (ECs) with ultrafast frequency response and/or integrated high capacitive performance. Herein, we report such ECs based on the highly conductive films of reduced graphene oxide (rGO) and commercially available poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) prepared by blade coating or filtration. The typical EC with ultrathin film electrodes exhibited a high-rate frequency response (phase angle = −81.4°) at 120 Hz. On the other hand, ECs with freestanding thick film electrodes exhibited outstanding capacitive performance with a wide range linear relationship between areal capacitance and mass loading. Particularly, an ultrathick film electrode with mass loading up to 33 mg cm⁻² delivered ultrahigh areal (5365 mF cm⁻²) and volumetric (203 F cm⁻³) specific capacitances at 1 A g⁻¹ (33 mA cm⁻²). The introduced wet-processing method perfectly integrates thin-film ECs for alternating current (AC) line-filtering and thick-film ECs for compact energy storage in one system, which is promising for practical applications.

中文翻译：

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用于多功能电化学电容器的坚固石墨烯复合膜，具有超宽的面质量负载范围，可实现高频率响应和超高比电容†

便携式电子设备的快速发展需要具有超快频率响应和/或集成高电容性能的小型且灵活的电化学电容器（EC）。在本文中，我们报告了这种ECs，这些ECs是基于高导电性的氧化石墨烯（rGO）薄膜和通过刀片涂布或过滤制备的市售聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）。具有超薄膜电极的典型EC在120 Hz时显示出较高的频率响应（相角= -81.4°）。另一方面，具有独立式厚膜电极的EC表现出出色的电容性能，在面积电容和质量负载之间具有宽范围的线性关系。特别是质量负载最大为33 mg cm ^-2的超厚膜电极在1 A g ^-1（33 mA cm ^-2）时提供超高面积（5365 mF cm ^-2）和体积（203 F cm ^-3）的比电容。引入的湿法处理方法将用于交流（AC）线路滤波的薄膜EC和用于紧凑型能量存储的厚膜EC完美地集成在一个系统中，这在实际应用中是有希望的。