Issue 5, 2022

Electro-oxidation of amino-functionalized multiwalled carbon nanotubes

Abstract

We report the electrochemistry of amino-functionalized multiwalled carbon nanotubes (MWCNTs-NH2) in the pH range from 0.3 to 6.4 using quantitative cyclic voltammetry (CV) and single entity electrochemistry measurements, making comparison with non-functionalized MWCNTs. CV showed the latter to both catalyze the solvent (water) decomposition and to undergo irreversible electro-oxidation forming oxygen containing surface functionality. The MWCNTs-NH2 additionally undergo an irreversible oxidation to an extent which is dependent on the pH of the solution, reflecting the variable amount of deprotonated amino groups present as a function of pH. Nano-impact experiments conducted at the single particle level confirmed the oxidation of both types of MWCNTs, showing agreement with the CV. The pKa of the amino groups in MWCNTs was determined via both electrochemical methods giving consistent values of ca. 2.5.

Graphical abstract: Electro-oxidation of amino-functionalized multiwalled carbon nanotubes

Supplementary files

Article information

Article type
Edge Article
Submitted
04 nov 2021
Accepted
10 jan 2022
First published
10 jan 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 1355-1366

Electro-oxidation of amino-functionalized multiwalled carbon nanotubes

Y. Lu, X. Li and R. G. Compton, Chem. Sci., 2022, 13, 1355 DOI: 10.1039/D1SC06122D

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