A single-atom iron catalyst on hierarchical N-doped carbon for highly efficient oxygen reduction in Zn-air batteries
Issued Date
2024-01-01
Resource Type
ISSN
20507488
eISSN
20507496
Scopus ID
2-s2.0-85196314091
Journal Title
Journal of Materials Chemistry A
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Materials Chemistry A (2024)
Suggested Citation
Gu J.F., Wang J., Wu Q., Wang C., Verpoort F., Chaemchuen S. A single-atom iron catalyst on hierarchical N-doped carbon for highly efficient oxygen reduction in Zn-air batteries. Journal of Materials Chemistry A (2024). doi:10.1039/d4ta03039g Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/98999
Title
A single-atom iron catalyst on hierarchical N-doped carbon for highly efficient oxygen reduction in Zn-air batteries
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Corresponding Author(s)
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Abstract
Single-atom iron electrocatalysts have emerged as up-and-coming alternatives to platinum-based catalysts for the oxygen reduction reaction. However, their further development has been impeded by complex fabrication procedures and limitations in long-term stability. This study developed a chemical vapor deposition approach for synthesizing an efficient iron single-atom electrocatalyst denoted as Fe-SA@NC, utilizing vaporized ferrocene to deposit on a hierarchical N-doped carbon derived from ZIF-8. The preparation process maintained the initial pore structure throughout the deposition process by utilizing a two-step pyrolysis, preventing the collapse or deformation of the pore structure and frameworks. The optimized catalyst exhibited an exceptional half-wave potential (0.932 V) and kinetic current density (28.38 mA cm−2 at 0.9 V vs. RHE), along with high turnover frequency (36.37 s−1) and mass activity (5.68 A mg−1), and remarkable long-term stability in an alkaline electrolyte, exceeding those of commercial Pt/C and most previously reported iron-based electrocatalysts. Moreover, it also demonstrated outstanding practicability in both liquid and solid Zn-air batteries. The formation of well-dispersed Fe-N4 with strong interaction on hierarchical N-doped carbon was verified in the correlation of the structural activity and the excellent performance of Fe-SA@NC. This work sheds some light on the facile synthesis of single-atom catalysts with effective efficiency and stability.