Significance Iron phthalocyanine (FePc) has been utilized for catalyzing oxygen reduction reaction (ORR) as inspired by natural enzymes. The assembled FePc with relatively ordered nanotube morphology shows superior electrocatalytic ORR… Click to show full abstract
Significance Iron phthalocyanine (FePc) has been utilized for catalyzing oxygen reduction reaction (ORR) as inspired by natural enzymes. The assembled FePc with relatively ordered nanotube morphology shows superior electrocatalytic ORR performance compared to FePc in a freely aggregated state and a molecularly dispersed state. The nanotube architecture shifts the ORR potentials above the redox potentials of Fe2+/3+ sites. This does not obey the redox-mediated mechanism operative on conventional FePc with a Fe2+–N moiety serving as the active sites. Instead, the electrocatalysis operates on a highly oxidized FePc ligating additional HO− ions, namely, a HO–Fe3+–N moiety. Such a moiety is intrinsically more active than the Fe2+–N moiety.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2024
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