In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC)
Abstract:
An oxygen reduction reaction (ORR) catalyst is a crucial component of metal–air batteries. Herein, modified carbon nanotubes are used to support iron phthalocyanine, followed by the fabrication of single-atom and cluster coexisting catalysts by the fast microwave method. The two catalysts have Fe–N 5 and Fe–P–N 4 coordination structures, respectively. Electrochemical tests show that the Fe NC /Fe–N 5 –C and Fe NC /Fe–P–N 4 –C catalysts have half-wave potentials of 0.906 and 0.886 V in an alkaline solvent, respectively. The Zn–air battery prepared with the Fe NC /Fe–N 5 –C catalyst has a specific capacity of 791 mA h g −1 and a maximum power density of 190 mW cm −2 . DFT calculations show that the axial coordination bonds in Fe NC /Fe–N 5 –C and Fe NC /Fe–P–N 4 –C are conducive to the acceleration of the transfer of electrons. The d-band centers of the axial coordination Fe–N 5 and Fe–P–N 4 are closer to the Fermi level, confirming that the presence of the axial coordination bonds enhances the adsorption of the reaction intermediates and reduces the ORR barriers.
Type of Medium:
Online Resource
ISSN:
2052-1553
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2024
detail.hit.zdb_id:
2757213-4
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