The Challenge of Achieving a High Density of Fe-Based Active Sites in a Highly Graphitic Carbon Matrix

Abstract : As one of the most promising platinum group metal-free (PGM-free) catalysts for oxygen reduction reaction (ORR), Fe–N–C catalysts with a high density of FeNx moieties integrated in a highly graphitic carbon matrix with a proper porous structure have attracted extensive attention to combine the high activity, high stability and high accessibility of active sites. Herein, we investigated a ZnCl2/NaCl eutectic salts-assisted ionothermal carbonization method (ICM) to synthesize Fe–N–C catalysts with tailored porous structure, high specific surface area and a high degree of graphitization. However, it was found to be challenging to anchor a high density of FeNx sites onto highly graphitized carbon. Iron precursors with preexisting Fe–N coordination were required to form FeNx sites in the nitrogen-doped carbon with a high degree of graphitization, while individual Fe and N precursors led to a Fe–N–C catalyst with poor-ORR activity. This provides valuable insights into the synthesis-structure relationship. Moreover, the FeNx moieties were identified as the major active sites in acidic conditions, while both FeNx sites and Fe2O3 were found to be active in alkaline medium
Type de document :
Article dans une revue
Domaine :
Liste complète des métadonnées

Littérature citée [55 références]  Voir  Masquer  Télécharger
Contributeur : Odile Hennaut <>
Soumis le : mercredi 27 mars 2019 - 10:22:44
Dernière modification le : mardi 28 mai 2019 - 14:06:15
Document(s) archivé(s) le : vendredi 28 juin 2019 - 13:16:15


Fichiers éditeurs autorisés sur une archive ouverte



Jingkun Li, Qingying Jia, Sanjeev Mukerjee, Moulay-Tahar Sougrati, Goran Drazic, et al.. The Challenge of Achieving a High Density of Fe-Based Active Sites in a Highly Graphitic Carbon Matrix. Catalysts, MDPI, 2019, 9 (2), pp.144. ⟨10.3390/catal9020144⟩. ⟨hal-02080940⟩



Consultations de la notice


Téléchargements de fichiers