Issue 12, 2023

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Abstract

The degradation of a single-site atomically dispersed, model Fe–N–C powder catalyst with high activity is investigated using cryo-Mössbauer spectroscopy. The results indicate a degradation initiated by an Fe2+ to Fe3+ oxidation due to coordination of oxygen to tetrapyrrolic Fe–N4 sites at atmospheric conditions (change between characteristic doublets) before iron(III) oxide is formed (sextet). Thermal reactivation can be used to restore substantial catalytic activity of aged Fe–N–C powders.

Graphical abstract: Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

Supplementary files

Article information

Article type
Communication
Submitted
28 Febr. 2023
Accepted
25 Sept. 2023
First published
04 Okt. 2023
This article is Open Access
Creative Commons BY license

Mater. Horiz., 2023,10, 5577-5583

Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe–N–C powders

D. Menga, F. E. Wagner and T. Fellinger, Mater. Horiz., 2023, 10, 5577 DOI: 10.1039/D3MH00308F

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