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Materials 2017, 10(12), 1353; doi:10.3390/ma10121353

Superelastic Graphene Aerogel/Poly(3,4-Ethylenedioxythiophene)/MnO2 Composite as Compression-Tolerant Electrode for Electrochemical Capacitors

College of Electronic and Optical Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
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Received: 13 October 2017 / Revised: 9 November 2017 / Accepted: 21 November 2017 / Published: 24 November 2017
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Abstract

Ultra-compressible electrodes with high electrochemical performance, reversible compressibility and extreme durability are in high demand in compression-tolerant energy storage devices. Herein, an ultra-compressible ternary composite was synthesized by successively electrodepositing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 into the superelastic graphene aerogel (SEGA). In SEGA/PEDOT/MnO2 ternary composite, SEGA provides the compressible backbone and conductive network; MnO2 is mainly responsible for pseudo reactions; the middle PEDOT not only reduces the interface resistance between MnO2 and graphene, but also further reinforces the strength of graphene cellar walls. The synergistic effect of the three components in the ternary composite electrode leads to high electrochemical performances and good compression-tolerant ability. The gravimetric capacitance of the compressible ternary composite electrodes reaches 343 F g−1 and can retain 97% even at 95% compressive strain. And a volumetric capacitance of 147.4 F cm−3 is achieved, which is much higher than that of other graphene-based compressible electrodes. This value of volumetric capacitance can be preserved by 80% after 3500 charge/discharge cycles under various compression strains, indicating an extreme durability. View Full-Text
Keywords: graphene; poly(3,4-ethylenedioxythiophene); MnO2; composite; compression-tolerant; electrode; electrochemical capacitors graphene; poly(3,4-ethylenedioxythiophene); MnO2; composite; compression-tolerant; electrode; electrochemical capacitors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lv, P.; Wang, Y.; Ji, C.; Yuan, J. Superelastic Graphene Aerogel/Poly(3,4-Ethylenedioxythiophene)/MnO2 Composite as Compression-Tolerant Electrode for Electrochemical Capacitors. Materials 2017, 10, 1353.

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