# Insights into the activity of single-atom Fe-N-C catalysts for oxygen reduction reaction

“Insights into the activity of single-atom Fe-N-C catalysts for oxygen reduction reaction” (2022), by Kang Liu et al. Energy research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: Kang Liu, Junwei Fu, Yiyang Lin, Tao Luo, Ganghai Ni, Hongmei Li, Zhang Lin, Min Liu
- Published: April 19, 2022
- Field: Energy
- DOI: https://doi.org/10.1038/s41467-022-29797-1
- Free PDF: https://www.nature.com/articles/s41467-022-29797-1.pdf

## Abstract

Single-atom Fe-N-C catalysts has attracted widespread attentions in the oxygen reduction reaction (ORR). However, the origin of ORR activity on Fe-N-C catalysts is still unclear, which hinder the further improvement of Fe-N-C catalysts. Herein, we provide a model to understand the ORR activity of Fe-N 4 site from the spatial structure and energy level of the frontier orbitals by density functional theory calculations. Taking the regulation of divacancy defects on Fe-N 4 site ORR activity as examples, we demonstrate that the hybridization between Fe 3 dz 2 , 3 dyz (3 dxz ) and O 2 π* orbitals is the origin of Fe-N 4 ORR activity. We found that the Fe–O bond length, the d-band center gap of spin states, the magnetic moment of Fe site and *O 2 as descriptors can accurately predict the ORR activity of Fe-N 4 site. Furthermore, these descriptors and ORR activity of Fe-N 4 site are mainly distributed in two regions with obvious difference, which greatly relate to the height of Fe 3 d projected orbital in the Z direction. This work provides a new insight into the ORR activity of single-atom M-N-C catalysts.

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