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3D Porous Binary-Heteroatom Doped Carbon Nanosheet/Electrochemically Exfoliated Graphene Hybrids for High Performance Flexible Solid-State Supercapacitors

Abstract

Graphene is a promising electrode material for high-performance supercapacitors. However, the intrinsic large surface area is usually underutilized caused by the unexpected re-stacking upon cycling. Here a novel N,S-codoped carbon nanosheet/electrochemically exfoliated graphene hybrid (denoted as CNS/EG) is prepared through a feasible electrochemical exfoliation process followed by a sol-gel method, effective activation is further conducted to fabricate the activated CNS/EG (a-CNS/EG). The as-prepared a-CNS/EG with the character of heteroatom doping and high accessible surface area (1532 m2 g-1) is used as electrode materials for supercapacitors, exhibiting remarkable specific capacitances of 341 and 200 F g-1 at current densities of 0.1 and 10 A g-1 in 6 mol L-1 KOH electrolyte, respectively. Furthermore, the assembled symmetric flexible solid-state supercapacitors with the electrode of a-CNS/EG and the electrolyte of PVA/KOH gel display a remarkable capacitance retention of 99 % after 10000 cycles at 3 A g-1. The fascinating electrochemical performance is owing to the distinctive structure of tiny carbon nanosheets uniformly distributed in electrochemically exfoliated graphene with N,S-codoping, which can effectively prevent the re-stacking and evoke the faradic contribution. What’s more, large ion storage and rapid ion transfer resulted from high surface area and hierarchical pore structure also play an important role in enhancing the electrical double layer capacitance.

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Publication details

The article was received on 03 Feb 2018, accepted on 16 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01148F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    3D Porous Binary-Heteroatom Doped Carbon Nanosheet/Electrochemically Exfoliated Graphene Hybrids for High Performance Flexible Solid-State Supercapacitors

    Y. Liu, X. Qiu, X. Liu, Y. Liu and L. Fan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01148F

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