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 ...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 FeNC/Fe–N_(5)–C and FeNC/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 FeNC/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 FeNC/Fe–N_(5)–C and FeNC/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.展开更多
基金supported by the National Natural Science Foundation of China(52362036)the Science and Technology Plan Project of Gansu Province(23JRRA691).
文摘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 FeNC/Fe–N_(5)–C and FeNC/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 FeNC/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 FeNC/Fe–N_(5)–C and FeNC/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.
