Volume 21, Issue 3 2409474
Research Article

Modulating the Iron Microenvironment for a Cooperative Interplay Between Fe-N-C Single Atoms and Fe3C Nanoclusters on the Oxygen Reduction Reaction

Anthony Dessalle

Anthony Dessalle

Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine, Épinal, F-88000 France

CNRS, Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA), Université de Lorraine, Vandœuvre-lès-Nancy, F-54500 France

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Javier Quílez-Bermejo

Javier Quílez-Bermejo

Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine, Épinal, F-88000 France

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Jean Wilfried Hounfodji

Jean Wilfried Hounfodji

CNRS, Laboratoire Lorrain de Chimie Moléculaire (L2CM), Université de Lorraine, Metz, F-57000 France

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Michael Badawi

Michael Badawi

CNRS, Laboratoire Lorrain de Chimie Moléculaire (L2CM), Université de Lorraine, Metz, F-57000 France

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Andrea Zitolo

Andrea Zitolo

Synchrotron SOLEIL, Départementale 128, Saint Aubin, 91190 France

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Mélanie Emo

Mélanie Emo

Institut Jean Lamour (IJL), Université de Lorraine, Nancy, 54011 France

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María T. Izquierdo

María T. Izquierdo

Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán 4, Zaragoza, E-50018 Spain

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Feina Xu

Feina Xu

CNRS, Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA), Université de Lorraine, Vandœuvre-lès-Nancy, F-54500 France

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Vanessa Fierro

Vanessa Fierro

Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine, Épinal, F-88000 France

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Alain Celzard

Corresponding Author

Alain Celzard

Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine, Épinal, F-88000 France

Institut Universitaire de France (IUF), Paris, F-75231 France

E-mail: [email protected]

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First published: 26 November 2024
Citations: 4

Abstract

The coexistence of single atoms and nanoparticles is shown to increase the oxygen reduction performance in Fe-N-C electrocatalysts, but the mechanisms underlying this synergistic effect remain elusive. In this study, model Fe-N-C electrocatalysts with controlled ratios of FeN4 sites and Fe3C nanoclusters is systematically designed and synthesized. Experiments and density functional theory (DFT) computations reveal that Fe3C nanoclusters near FeN4 sites modulate the electron density of the Fe single-atom microenvironment through an electron withdrawing effect. This substantially alters the oxygen reduction reaction (ORR) mechanisms and boosts the catalytic performance of FeN4 sites. This study provides fundamental insights into the dynamic catalytic impact of single atoms and nanoparticle coexistence in advanced Fe-N-C electrocatalysts for the ORR, paving the way for further refinement through various combinations.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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