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Issue 20, 2020
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Trifluoromethyl functionalized polyindoles: electrosynthesis, characterization, and improved capacitive performance

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Abstract

Fluorination of conjugated polymers has been explored as a viable strategy for enhancing the overall performance of corresponding polymers. In this work, two trifluoromethylated polyindoles (5-PFMIn and 6-PFMIn) are synthesized via simple electropolymerization and applied as energy storage materials for supercapacitors. Spectroscopic, morphological, thermal stability, and electrochemical analyses of trifluoromethylated polyindoles and their non-fluorinated counterparts (5-PMIn and 6-PMIn) are performed to reveal the significant effect of the trifluoromethyl group on the properties of polymers. Compared with non-fluorinated counterparts, 5-PFMIn and 6-PFMIn show rougher morphologies and higher thermal stabilities, and more interestingly, the fluorination of polyindoles results in substantial improvement of their electrochemical behavior. The specific capacitances of 5-PFMIn and 6-PFMIn are found to be 269 F g−1 and 296 F g−1 at 10 A g−1, respectively with excellent cycling stability of about 90% after 5000 cycles, which are superior to those of their counterparts, 5-PMIn (75 F g−1, 73%) and 6-PMIn (178 F g−1, 70%). The promising trifluoromethylated polyindoles demonstrate high potential for electrochemical capacitor application.

Graphical abstract: Trifluoromethyl functionalized polyindoles: electrosynthesis, characterization, and improved capacitive performance

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Supplementary files

Article information


Submitted
15 Feb 2020
Accepted
30 Apr 2020
First published
07 May 2020

New J. Chem., 2020,44, 8512-8519
Article type
Paper

Trifluoromethyl functionalized polyindoles: electrosynthesis, characterization, and improved capacitive performance

R. Wang, Y. Xue, F. Jiang, W. Zhou, J. Xu, X. Duan, D. Zhu, L. Xu, Y. Cai and A. Liang, New J. Chem., 2020, 44, 8512
DOI: 10.1039/D0NJ00812E

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