Remarkably enhanced performances of novel polythiophene-grafting-graphene oxide composite via long alkoxy linkage for supercapacitor application

A long alkoxy substituted polythiohene poly[3-(2-(2-(2-(2-(diethanolamino)ethoxy)ethoxy)ethoxy)ethoxy)thiophene] (PD4ET) was chemically grafted to the graphene oxide (GO) nanosheets via esterification reaction to give a novel PD4ET-g-GO nanocomposite. The formation of a bridge between PD4ET and GO i...

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Bibliographic Details
Published in:Carbon (New York) 2019-06, Vol.147, p.519-531
Main Authors: Li, Yueqin, Zhou, Minya, Wang, Yiting, Pan, Qiuxia, Gong, Qiang, Xia, Zongbiao, Li, Yun
Format: Article
Language:English
Subjects:
Alkoxy linkage
Capacitance
Chemical reactions
Covalent grafting
Cycles
Electrochemical analysis
Electrodes
Esterification
Fourier transforms
Grafting
Graphene
Graphene oxide
Light emitting diodes
Nanocomposites
Organic chemistry
Performance enhancement
Photoelectrons
Polythiophene
Stability
Supercapacitor
Supercapacitors
Thickness
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:A long alkoxy substituted polythiohene poly[3-(2-(2-(2-(2-(diethanolamino)ethoxy)ethoxy)ethoxy)ethoxy)thiophene] (PD4ET) was chemically grafted to the graphene oxide (GO) nanosheets via esterification reaction to give a novel PD4ET-g-GO nanocomposite. The formation of a bridge between PD4ET and GO is confirmed and characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS). The morphological details and elemental compositions analysis indicates that the PD4ET is successfully grafted to the edge of GO sheets with a few nanometers thickness. More significantly, PD4ET-g-GO electrode exhibit enhanced electrochemical performance with a maximum specific capacitance of 971 F/g at a current density of 1 A/g using a three-electrode system, which is much higher than that of each individual component and the physical mixture. High energy and power density is achieved up to 66.11 Wh/kg and 350 W/kg and of 38.11 Wh/kg and 7000 W/kg, respectively. The cycling stability investigation showed that PD4ET-g-GO based capacitor can preserve 98% of its initial capacitance within 10000 consecutive charge-discharge cycles, suggesting a good cycling stability for the composite electrodes. Furthermore, the fabricated solid-state supercapacitor device shows remarkable electrochemical performance, which can power the red LED diode in series connection. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.03.030