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Ultrahigh volumetric performance of free-standing compact N-doped holey graphene/PANI slice for supercapacitors

Abstract

The volumetric capacitance, rate capability and cycling life performance are extremely important metrics for supercapacitors with limited space. Unfortunately, the volumetric performance is relatively inferior for most of supercapacitors because of their low packing density. Herein, we developed a novel facile strategy to prepare a binder-free and free-standing N-doped holey graphene/PANI slice (HNHG-PANI), which not only possesses a high packing density (1.45 g cm-3) but also still maintains a highly interconnected pore connectivity channel for efficient ion transport without compromising electrochemical energy storage. In addition, the nanopores in N-doped holey graphene can immensely accelerate the ion transmission across the entire surface area. The HNHG-PANI material electrode can deliver ultrahigh volumetric capacitance (1058 F cm-3 at 0.5 A g-1), excellent rate performance and long-term cycling stability. Meanwhile, the symmetrical supercapacitor can achieve high volumetric energy density of 26.5 Wh L-1 at an impressive volumetric power density of 175.3 W L-1. Such dense packing free-standing N-doped holey graphene/PANI slice is an extraordinary promising candidate for compact and miniaturized energy storage equipment in the future. Furthermore, the novel simple strategy method for this paper could be used to synthesize other similar materials for different applications.

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Publication details

The article was received on 19 May 2017, accepted on 10 Jul 2017 and first published on 10 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04384H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ultrahigh volumetric performance of free-standing compact N-doped holey graphene/PANI slice for supercapacitors

    Z. fan, Z. Cheng, J. feng, Z. Xie, Y. Liu and Y. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04384H

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