Effect of the N content of Fe/N/graphene catalysts for the oxygen reduction reaction in alkaline media

In this work a series of N-modified graphene composites with different N/C ratios have been synthesised. The incorporation of Fe atoms into the N-modified graphene composites leads to the formation of Fe/N/C ensembles on the outer graphene layers along with Fe3C and metallic Fe phases in the bulk of...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-01, Vol.3 (48), p.24487-24494
Main Authors: Dominguez, Carlota, Perez-Alonso, F J, Salam, Mohamed Abdel, Al-Thabaiti, Shaeel A, Pena, Miguel A, Barrio, L, Rojas, S
Format: Article
Language:English
Subjects:
Accessibility
Electrocatalysts
Graphene
Iron
Nanostructure
Nitrogen
Oxygen
Reduction
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Summary:In this work a series of N-modified graphene composites with different N/C ratios have been synthesised. The incorporation of Fe atoms into the N-modified graphene composites leads to the formation of Fe/N/C ensembles on the outer graphene layers along with Fe3C and metallic Fe phases in the bulk of the graphite nanoplates as revealed by X-ray absorption and XPS analyses. The adequate choice of the N/C atomic ratio of precursors to prepare Fe/N/graphene based materials is crucial to obtain electrocatalysts with an optimal performance for the ORR. The activity for the oxygen reduction reaction (ORR) of the Fe/N-graphene based electrocatalysts increases with increasing amount of accessible nitrogen, that is, with the amount of nitrogen by surface area.
ISSN:2050-7488
2050-7496
DOI:10.1039/c5ta04355g