Issue 21, 2022

Single atom Fe-based catalyst derived from hierarchical (Fe,N)-ZIF-8/CNFs for high-efficient ORR activity

Abstract

The development of high-efficiency, stable, and low-cost Fe–N–C electrocatalysts for the oxygen reduction reaction (ORR) has attracted considerable attention. Herein, a stable atomically dispersed Fe–Nx-based catalyst was synthesized from a hierarchical structure involving carbon nanofiber (CNF)-supported zeolitic-imidazolate-framework-8 (ZIF-8) encapsulated Fe–Phen complex ((Fe,N)-ZIF-8/CNFs). The Fe–Nx–CNFs obtained from the pyrolysis of (Fe,N)-ZIF-8/CNFs showed a good hierarchical multi-layer structure. The natural network structure of the carbon nanofibers serves as a matrix to uniformly distribute the ZIF-8 particles, and the Fe–Nx sites derived from the Fe–Phen complex were uniformly distributed in ZIF-8 particles. It exhibits excellent ORR performance with a high half-wave potential of 0.875 V (vs. RHE), which was 55 mV higher than that of the commercial Pt/C catalyst. In addition, density functional theory (DFT) calculations on the catalyst further revealed the origin of the ORR activity via a 4e pathway from the precise local coordination of FeN4 sites.

Graphical abstract: Single atom Fe-based catalyst derived from hierarchical (Fe,N)-ZIF-8/CNFs for high-efficient ORR activity

Supplementary files

Article information

Article type
Research Article
Submitted
28 Jul 2022
Accepted
03 Sep 2022
First published
06 Sep 2022

Mater. Chem. Front., 2022,6, 3213-3224

Single atom Fe-based catalyst derived from hierarchical (Fe,N)-ZIF-8/CNFs for high-efficient ORR activity

W. Miao, F. Huang, X. Shen, S. Li, X. Cao, X. Zhang, J. Yu and X. Dong, Mater. Chem. Front., 2022, 6, 3213 DOI: 10.1039/D2QM00763K

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