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Materials 2018, 11(5), 799; https://doi.org/10.3390/ma11050799

Performance-Enhanced Activated Carbon Electrodes for Supercapacitors Combining Both Graphene-Modified Current Collectors and Graphene Conductive Additive

1
Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
2
School of Nano Technology and Nano Bionics, University of Science and Technology of China, Hefei 230026, China
3
SZGraphene Nanotechnology Co., Ltd., Suzhou 215123, China
*
Authors to whom correspondence should be addressed.
Received: 17 April 2018 / Revised: 9 May 2018 / Accepted: 9 May 2018 / Published: 15 May 2018
(This article belongs to the Special Issue Advanced Functional Nanomaterials and Their Applications)
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Abstract

Graphene has been widely used in the active material, conductive agent, binder or current collector for supercapacitors, due to its large specific surface area, high conductivity, and electron mobility. However, works simultaneously employing graphene as conductive agent and current collector were rarely reported. Here, we report improved activated carbon (AC) electrodes (AC@G@NiF/G) simultaneously combining chemical vapor deposition (CVD) graphene-modified nickel foams (NiF/Gs) current collectors and high quality few-layer graphene conductive additive instead of carbon black (CB). The synergistic effect of NiF/Gs and graphene additive makes the performances of AC@G@NiF/G electrodes superior to those of electrodes with CB or with nickel foam current collectors. The performances of AC@G@NiF/G electrodes show that for the few-layer graphene addition exists an optimum value around 5 wt %, rather than a larger addition of graphene, works out better. A symmetric supercapacitor assembled by AC@G@NiF/G electrodes exhibits excellent cycling stability. We attribute improved performances to graphene-enhanced conductivity of electrode materials and NiF/Gs with 3D graphene conductive network and lower oxidation, largely improving the electrical contact between active materials and current collectors. View Full-Text
Keywords: activated carbon; supercapacitor; electrodes; graphene; nickel foam; current collector; conductive additive; electrochemical properties activated carbon; supercapacitor; electrodes; graphene; nickel foam; current collector; conductive additive; electrochemical properties
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Wang, R.; Qian, Y.; Li, W.; Zhu, S.; Liu, F.; Guo, Y.; Chen, M.; Li, Q.; Liu, L. Performance-Enhanced Activated Carbon Electrodes for Supercapacitors Combining Both Graphene-Modified Current Collectors and Graphene Conductive Additive. Materials 2018, 11, 799.

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