Issue 8, 2022

New insights into the key bifunctional role of sulfur in Fe–N–C single-atom catalysts for ORR/OER

Abstract

Sulfur-doping of non-noble metal Fe–N–C single-atom catalysts (SACs) shows a key bifunctional role in promoting ORR and OER activity. The controversial claims about the enhanced ORR activity and the ambiguity of the OER activity brought about by S-doping demand in-depth investigation. Here, systematic theoretical investigation was carried out. Unlike previously believed, coordinative S-doping gives rise to a precisely regulated OOH* stabilization effect, which is revealed to be the origin of the bifunctional ORR/OER activity. The fine regulation is reflected in two aspects: (1) Compared with other intermediates, the regulation of OOH* adsorption is more obvious. (2) More sulfur-doping leads to excessive strong or weak stabilization, which is not conducive to ORR/OER. The single S doping elevates the charge density and opens the metallic spin channels of Fe–N3|S, moves the d-band center towards the Fermi level, all contributing to moderate OOH* stabilization. It is hoped that these results will promote the development of heteroatom-doped bifunctional SACs.

Graphical abstract: New insights into the key bifunctional role of sulfur in Fe–N–C single-atom catalysts for ORR/OER

Supplementary files

Article information

Article type
Paper
Submitted
29 nov 2021
Accepted
26 jan 2022
First published
27 jan 2022

Nanoscale, 2022,14, 3212-3223

New insights into the key bifunctional role of sulfur in Fe–N–C single-atom catalysts for ORR/OER

X. Zhang, Q. Zhang, J. Cui, J. Yan, J. Liu and Y. Wu, Nanoscale, 2022, 14, 3212 DOI: 10.1039/D1NR07851H

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