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Polythiophene Grafted onto Single‐Wall Carbon Nanotubes through Oligo(ethylene oxide) Linkages for Supercapacitor Devices with Enhanced Electrochemical Performance
Author(s) -
Zhou Minya,
Li Yueqin,
Gong Qiang,
Xia Zongbiao,
Yang Yong,
Liu Xiaohui,
Wang Jie,
Gao Qinwei
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901074
Subject(s) - materials science , supercapacitor , carbon nanotube , fourier transform infrared spectroscopy , chemical engineering , polythiophene , raman spectroscopy , x ray photoelectron spectroscopy , electrode , ethylene oxide , oxide , capacitance , electrochemistry , analytical chemistry (journal) , nanotechnology , conductive polymer , polymer , composite material , organic chemistry , chemistry , optics , physics , copolymer , engineering , metallurgy
Poly(3‐oligo(ethylene oxide))thiophene (PD2ET) with an ethanolamine terminal in the side chain was covalently grafted onto the surface of single‐walled carbon nanotube bundles (PD2ET‐g‐SWCNTs) by using an esterification reaction. The chemical bond between PD2ET and the SWCNTs is confirmed by using various techniques, such as Fourier transform infrared (FTIR), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS) analysis. The microstructural and morphological investigation revealed a good distribution of PD2ET on the surface of the SWCNTs, with a thickness of about 2–3 nm. As an electroactive material, the fabricated PD2ET‐g‐SWCNTs electrode demonstrated high capacitive performance in electrochemical tests, in which an efficient specific capacitance of 399 F/g at 1 A/g was obtained from galvanostatic charge/discharge techniques. Furthermore, the long‐term stability investigation of PD2ET‐g‐SWCNTs electrode showed that over 91 % capacitance retention could be retained after 8000 successive charge/discharge cycles. The integrated two‐electrode supercapacitor based on the PD2ET‐g‐SWCNTs hybrid exhibited a high energy density of 22.5 Wh/kg and a power density of 500 W/kg at 0.625 A/g. The enhanced electrochemical behavior of the PD2ET‐g‐SWCNTs hybrid can be ascribed to the contribution of oligo(ethylene oxide), which facilitates ion diffusion and enables a faster charge process, thus rendering high efficiency in supercapacitors.