Amine-functionalized multi-walled carbon nanotubes (EDA-MWCNTs) for electrochemical water splitting reactions

Abstract

Herein, this work highly efficient and inexpensive metal-free multifunctional electrocatalyst demonstrated for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) effectively for all pH. This current studies presents...

Melamine functionalised multiwalled carbon nanotubes (M-MWCNTs) as a metal-free electrocatalyst for simultaneous determination of 4-nitrophenol and nitrofurantoin

“…Previously, attempts have been made to introduce amine functionalities onto MWCNTs. 40 However, present the study provided an electrocatalyst with more amine functionalities (as melamine has more than one –NH 2 group) on the MWCNTs so that this increased the electron density on the MWCNTs which eventually resulted in better electrocatalytic activity. The calculated amount, i.e.…”

“…An increase in the I D /I G ratio after the melamine functionalisation confirmed the successful decoration of melamine onto the MWCNTs, and hence, the density of the defective carbon increases were in good agreement, and also helped to give an increase of the electrocatalytic activity to the 4-NP and NFT reduction reaction. 40 Fig. 5 shows XPS spectra, which gives an idea of the elemental abundance and the electronic state of the elements in the synthesized M-MWCNTs, it clearly shows that elemental abundance of carbon is 88.87%, oxygen is 8.36% and nitrogen is 2.77%.…”

“…An increase in the I D / I G ratio after the melamine functionalisation confirmed the successful decoration of melamine onto the MWCNTs, and hence, the density of the defective carbon increases were in good agreement, and also helped to give an increase of the electrocatalytic activity to the 4-NP and NFT reduction reaction. 40…”

“…Previously, attempts have been made to introduce amine functionalities onto MWCNTs. 40 However, present the study provided an electrocatalyst with more amine functionalities (as melamine has more than one -NH 2 group) on the MWCNTs so that this increased the electron density on the MWCNTs which eventually resulted in better electrocatalytic activity. The calculated amount, i.e., 227 mg of MWCNTs, was suspended in 50 mL of DMF in a round bottomed flask and then subjected to ultrasonication for 1 h. In another round bottomed flask, 924 mL of DIPEA was added to 50 mL of DMF containing 227 mg of melamine in cold conditions.…”

High degree of N-functionalization in macroscopically assembled carbon nanotubes

“…Amino-groups functionalized CNTs have been demonstrated as high-rate and highly cyclable capacitors, benefiting from doublelayer capacitance due to the hydrophobicity but also strong pseudocapacitance from the increase active sites for redox reactions [22]. Further, amine-functionalized CNTs have been demonstrated to have hydrogen evolution and oxygen evolution reactions with efficacies comparable to traditional metal-based electrocatalysts and strong stability [23]. It is clear that a wealth of applications can be enhanced depending on the predominant functional groups.…”