Iron atom-cluster interactions increase activity and improve durability in Fe-N-C fuel cells.
Nat Commun
; 13(1): 2963, 2022 May 26.
Article
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| MEDLINE
| ID: mdl-35618792
ABSTRACT
Simultaneously increasing the activity and stability of the single-atom active sites of M-N-C catalysts is critical but remains a great challenge. Here, we report an Fe-N-C catalyst with nitrogen-coordinated iron clusters and closely surrounding Fe-N4 active sites for oxygen reduction reaction in acidic fuel cells. A strong electronic interaction is built between iron clusters and satellite Fe-N4 due to unblocked electron transfer pathways and very short interacting distances. The iron clusters optimize the adsorption strength of oxygen reduction intermediates on Fe-N4 and also shorten the bond amplitude of Fe-N4 with incoherent vibrations. As a result, both the activity and stability of Fe-N4 sites are increased by about 60% in terms of turnover frequency and demetalation resistance. This work shows the great potential of strong electronic interactions between multiphase metal species for improvements of single-atom catalysts.
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2022
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Article