Understanding the oxygen-containing functional groups on multiwall carbon nanotubes toward supercapacitors. (March 2021)

• Record Type: Journal Article
• Authors: Chen, J.; Li, C.; Lian, Y.; Chen, Y.; Chen, T.; Hu, X.
• Is Part Of: Materials today chemistry. Volume 19(2021)
• Publication Date: 2021-03
• Subjects: Rapid annealing -- Surface modification -- Redox reaction -- Citric acid -- Electrochemistry; OFGs oxygen containing functional groups; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2020.100414
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Typical functionalization treatment by strong acid is used to introduce functional groups into/onto the multiwall carbon nanotubes (MWCNTs), to enhance the desired redox activity for electrochemical applications. The influence of various functional groups on the redox of MWCNT has been studied in recent years. Different functional groups on MWCNT can be removed selectively using different thermal annealing temperatures. By this method, it is recognized that carboxyl, anhydride, and phenol groups play essential roles in the redox reaction. A designed carboxyl/anhydride-rich defective MWCNT is fabricated with a superior specific areal capacitance of 34.55 mF/cm 2 . These results provide more information for the study of the MWCNTs' electrochemical applications toward supercapacitors and batteries. Graphical abstract: By using the rapid thermal annealing process to gradually remove various functional groups on the multiwall carbon nanotubes (MWCNTs), by this method, it is recognized that carboxyl, anhydride, and phenol groups play essential roles in the redox reaction. Image 1 Highlights: A rapid annealing process could successfully remove different functional groups. The carbonyl/quinone on MWCNTs will not cause effects on the redox activity. The carboxyl/anhydride is beneficial for the redox activity. A specific areal capacitance of 34.55 mF/cm 2 was achieved by the carboxyl-rich MWCNTs.