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Effect of different chemical modification of carbon nanotubes for the oxygen reduction reaction in alkaline media

Lookup NU author(s): Dr Aurelia-Anca Dumitru, Professor Mohamed MamloukORCiD, Emeritus Professor Keith Scott


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The electrochemical reduction of oxygen on chemically modified multi-walled carbon nanotubes (CNTs) electrodes in 1 M KOH solution has been studied using the rotating ring disc electrode (RDE). The surface modification of CNTs has been estimated by XPS and Raman spectroscopy. The effect of different oxygen functionalities on the surface of carbon nanotube for the oxygen reduction reaction (ORR) is considered in terms of the number of electrons (n) involved.Electrochemical studies indicate that in the case of the modification of CNTs with citric acid and diazonium salts the n values were close to two in the measured potential range, and the electrochemical reduction is limited to the production of peroxide as the final product. In the case of the modification of carbon nanotubes with peroxymonosulphuric acid, in the measured potential range, then value is close to 4 indicating the four-electron pathway for the ORR. By correlating ORR measurements with the XPS analysis, we propose that the increase in electrocatalytic activity towards the ORR, for CNT can be attributed to the increase in C-O groups on the surface of CNTs after modification with peroxymonosulphuric acid. (C) 2014 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Dumitru A, Mamlouk M, Scott K

Publication type: Article

Publication status: Published

Journal: Electrochimica Acta

Year: 2014

Volume: 135

Pages: 428-438

Print publication date: 20/07/2014

Online publication date: 14/05/2014

Acceptance date: 21/04/2014

ISSN (print): 0013-4686

ISSN (electronic): 1873-3859

Publisher: Pergamon Press


DOI: 10.1016/j.electacta.2014.04.123


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Funder referenceFunder name
European Union
FP7-PEOPLE-2010-IEFMarie Curie Actions-Intra-European Fellowship