Tailoring Oxygen Reduction Reaction Kinetics of Fe−N−C Catalyst via Spin Manipulation for Efficient Zinc–Air Batteries

The interaction between oxygen species and metal sites of various orbitals exhibits intimate correlation with the oxygen reduction reaction (ORR) kinetics. Herein, a new approach for boosting the inherent ORR activity of atomically dispersed Fe−N−C matrix is represented by implanting Fe atomic clust...

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Vydáno v:	Advanced materials (Weinheim) Ročník 36; číslo 25; s. e2400523 - n/a
Hlavní autoři:	Zhang, Huiwen, Chen, Hsiao‐Chien, Feizpoor, Solmaz, Li, Linfeng, Zhang, Xia, Xu, Xuefei, Zhuang, Zechao, Li, Zhishan, Hu, Wenyu, Snyders, Rony, Wang, Dingsheng, Wang, Chundong
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Germany Wiley Subscription Services, Inc 01.06.2024
Témata:	Atomic clusters Chemical reduction Clusters Density functional theory Electron spin Fe─N─C Metal air batteries oxygen reduction reaction Oxygen reduction reactions Reaction kinetics Rechargeable batteries Single atom catalysts spin‐state transition Zinc-oxygen batteries zinc–air batteries reaction kinetics spin‐state transition oxygen reduction reaction Fe–N–C zinc–air batteries
ISSN:	0935-9648, 1521-4095, 1521-4095
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Popis
Shrnutí:	The interaction between oxygen species and metal sites of various orbitals exhibits intimate correlation with the oxygen reduction reaction (ORR) kinetics. Herein, a new approach for boosting the inherent ORR activity of atomically dispersed Fe−N−C matrix is represented by implanting Fe atomic clusters nearby. The as‐prepared catalyst delivers excellent ORR activity with half‐wave potentials of 0.78 and 0.90 V in acidic and alkaline solutions, respectively. The decent ORR activity can also be validated from the high‐performance rechargeable Zn–air battery. The experiments and density functional theory calculations reveal that the electron spin‐state of monodispersed Fe active sites is transferred from the low spin (LS, t2g6 eg0) to the medium spin (MS, t2g5 eg1) due to the involvement of Fe atomic clusters, leading to the spin electron filling in σ∗ orbit, by which it favors OH− desorption and in turn boosts the reaction kinetics of the rate‐determining step. This work paves a solid way for rational design of high‐performance Fe‐based single atom catalysts through spin manipulation. Implanting Fe atomic clusters on Fe−N−C matrix is achieved by a developed pyrolyzing method of double‐ligand zinc‐based zeolite framework. Spin‐state of Fe single atoms verified from low spin (LS, t2g6 eg0) to medium spin (MS, t2g5 eg1) enables boosting the reaction kinetics of the rate‐determining step, which finally leads to advanced oxygen reduction reaction activities and Zn–air batteries performance.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0935-9648 1521-4095 1521-4095
DOI:	10.1002/adma.202400523