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Robust graphene composite films for multifunctional electrochemical capacitors with an ultrawide range of areal mass loading toward high-rate frequency response and ultrahigh specific capacitance

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Abstract

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.

Graphical abstract: Robust graphene composite films for multifunctional electrochemical capacitors with an ultrawide range of areal mass loading toward high-rate frequency response and ultrahigh specific capacitance

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Publication details

The article was received on 25 Nov 2017, accepted on 22 Jan 2018 and first published on 22 Jan 2018


Article type: Communication
DOI: 10.1039/C7EE03349D
Citation: Energy Environ. Sci., 2018, Advance Article
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    Robust graphene composite films for multifunctional electrochemical capacitors with an ultrawide range of areal mass loading toward high-rate frequency response and ultrahigh specific capacitance

    M. Zhang, X. Yu, H. Ma, W. Du, L. Qu, C. Li and G. Shi, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C7EE03349D

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