Highly Mesoporous Graphitic Catalysts with Ternary Doping Structure towards Highly Efficient Oxygen Reduction

Abstract

A new template-approach was demonstrated to fabricate Co, N and S co-doped nanoporous graphitic structure for efficiently catalyzing ORR. For preparing such catalyst, a core-shell precursor (FeX@SNDG) was prepared with S and N co-doped graphitic shells by catalytic pyrolysis, and then S and N co-doped nanoporous graphitic structure was purified by removing ferrous cores with mixed acids. The existence of S-doping could modify the active sites to enhance the catalysis of ORR, compared with only Co and N co-doped carbonous catalysts. Co-SN-GCs have more positive onset potential (0.97 vs. 0.93 V) and higher kinetic current density (6.2 vs. 5.5 mA cm-2 at 0.6 V) than Fe-SN-GCs; density-functional theory calculations indicated formation barrier is much lower at Co-SN sites than at Fe-SN sites (0.573 vs. 0.729 eV) in the rate-determining step of oxygen reduction reaction.

Supplementary files

Article information

Article type
Paper
Submitted
15 Mar 2025
Accepted
01 Jun 2025
First published
06 Jun 2025

Catal. Sci. Technol., 2025, Accepted Manuscript

Highly Mesoporous Graphitic Catalysts with Ternary Doping Structure towards Highly Efficient Oxygen Reduction

Q. J. Zhang, Z. M. Sheng, X. Hong, W. T. Feng, S. Yang, K. Zhu and S. Han, Catal. Sci. Technol., 2025, Accepted Manuscript , DOI: 10.1039/D5CY00324E

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