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Oxygen Reduction Reaction in Electrochemically Reduced Graphene Oxide

Bikkarolla, SK, Cumpson, P, Joseph, P and Papakonstantinou, P (2014) Oxygen Reduction Reaction in Electrochemically Reduced Graphene Oxide. Faraday Discussions, 173 . pp. 415-428. [Journal article]

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URL: http://pubs.rsc.org/en/Content/ArticleLanding/2014/FD/C4FD00088A#!divAbstract

DOI: 10.1039/C4FD00088A

Abstract

We show that partially reduced graphene oxide electrocatalyst, synthesized by electrochemical reduction of graphene oxide (GO) displays significantly enhanced catalytic activity towards oxygen reduction reaction (ORR) in alkaline solutions compared to the starting GO. The electrochemical partial reduction of GO was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy.Electrochemical impedance spectroscopy (EIS) verified the enhanced electron transfer ability of the electrochemically reduced graphene oxide (ErGO) compared to GO. The resultant ErGO electrode showed an enhanced capacitance and an ORR onset potential of -0.11 V vs Ag/AgCl similar to that of nitrogen doped reduced graphene oxide (NrGO) electrode produced by a hydrothermal process. However the ErGO exhibited considerably lower electron transfer numbers (2.0 – 3.3 at potential range of -0.4 V to -1.0 V) indicating that although both catalysts operate under combined 4e- and 2e- ORR processes, ErGO follows a more predominant 2epathway. The ORR process in ErGO has been linked to the presence of quinone functional groups, which favour the 2e- ORR pathway.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
Built Environment Research Institute > Fire Safety and Engineering Research and Technology Centre (FireSERT)
ID Code:29878
Deposited By: Professor Pagona Papakonstantinou
Deposited On:12 Aug 2014 08:07
Last Modified:17 Oct 2017 16:15

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