Effect of the N content of Fe/N/graphene catalysts for the oxygen reduction reaction in alkaline media. Issue 48 (23rd November 2015)

• Record Type: Journal Article
• Authors: Domínguez, Carlota; Pérez-Alonso, F. J.; Salam, Mohamed Abdel; Al-Thabaiti, Shaeel A.; Peña, Miguel A.; Barrio, L.; Rojas, S.
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 48(2015)
• Page Start: 24487
• Page End: 24494
• Publication Date: 2015-11-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5ta04355g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The ORR activity of Fe/N/G is a balance between the N-content and BET area. Abstract : 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 Fe3 C 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.