Evidence for the stabilization of FeN4 sites by Pt particles during acidic oxygen reduction

Evidence for the stabilization of FeN4 sites by Pt particles during acidic oxygen reduction

Abstract While Fe–N–C materials have shown promising initial oxygen reduction reaction (ORR) activity, they lack durability in acidic medium. Key degradation mechanisms include FeN4 site demetallation and deactivation by reactive oxygen species. Here we show for mainstream Fe–N–Cs that adding 1 wt.%...

Full description

Saved in:
Bibliographic Details
Main Authors: Nicolas A. Ishiki, Keyla Teixeira Santos, Nicolas Bibent, Kavita Kumar, Ina Reichmann, Yu-Ping Ku, Tristan Asset, Laetitia Dubau, Michel Mermoux, Hongxin Ge, Sandrine Berthon-Fabry, Viktoriia A. Saveleva, Vinod K. Paidi, Pieter Glatzel, Andrea Zitolo, Tzonka Mineva, Hazar Guesmi, Serhiy Cherevko, Edson A. Ticianelli, Frédéric Maillard, Frédéric Jaouen
Format: Article
Language:English
Published: Nature Portfolio 2025-07-01
Series:Nature Communications
Online Access:https://doi.org/10.1038/s41467-025-61806-x
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Abstract While Fe–N–C materials have shown promising initial oxygen reduction reaction (ORR) activity, they lack durability in acidic medium. Key degradation mechanisms include FeN4 site demetallation and deactivation by reactive oxygen species. Here we show for mainstream Fe–N–Cs that adding 1 wt.% Pt nanoparticles via a soft polyol method results in well-defined and stable Pt/Fe–N–C hybrids. The Pt addition strongly reduces the H2O2 production and Fe leaching rate during ORR, while post mortem Mössbauer spectroscopy reveals that the highly active but unstable Fe(III)N4 site is partially stabilized. The similar H2O2 electroreduction activity of Pt/Fe–N–C and Fe–N–C and other analyses point toward a long-distance electronic effect of Pt nanoparticles in stabilizing FeN4 sites. Computational chemistry reveals that spin polarization of distant Pt atoms mitigates the structural changes of FeN4 sites upon adsorption of oxygenated species atop Fe, especially in high-spin state.
ISSN:2041-1723

Similar Items