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Hierarchically porous sheath-core graphene-based fiber-shaped supercapacitors with high energy density

Abstract

Owing to the high-power density, fast charge/discharge rate, ultralong cycling life and safe operating conditions, all-carbon fiber-shaped supercapacitors (FSSCs) hold great promise for powering wearable electronics. However, their low energy density hinders them from practical applications. Herein, we develop a scalable and cost-effective strategy towards hierarchically-porous sheath-core graphene-fiber-based electrodes with rational pore size distribution (PSD, 88-97% micropore, 0-8.3% mesopores and 1.9-4.2% macropores) and high specific surface area (416.4 m2/g). The hierarchical architecture is achieved by simply decorating graphene fiber with carbonized phenol formaldehyde (CPF) resin containing small-size (~156 nm) graphene (SG), wherein CPF and SG work synergistically to provide ultrahigh micro-porosity with narrowed micro-/meso-PSDs and enhanced electrical conductivity, facilitating the ion storage and transport. The sheath-core graphene-based fibers hold a slight larger tensile force than that of graphene fibers. The assembled FSSCs exhibit an ultrahigh specific areal capacitance of 391.2 mF/cm2 in H2SO4/PVA gel electrolyte at 0.1 mA/cm2 in a two-electrode cell, which is 17 times of that of graphene fibers. The entire-device energy density reaches 8.7 and 66.4 μWh/cm2 in H2SO4/PVA and EMIMBF4/PVDF gel electrolyte, respectively. Moreover, the FSSCs show 98.9% capacitance retention after 7,000 cycles and good flexibility. These results make it one of the best reported all-carbon FSSCs to date. This work may shed light on mass-manufacturing, low-cost and high-performance fiber-shaped energy storage devices.

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Publication details

The article was received on 21 Sep 2017, accepted on 06 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08362A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchically porous sheath-core graphene-based fiber-shaped supercapacitors with high energy density

    X. Zheng, K. Zhang, L. Yao, Y. Qiu and S. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08362A

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