@article{Chen2023, 
author = {Changli Chen and Haijing Li and Jingzhao Chen and Dong Li and Wenxing Chen and Juncai Dong and Mengru Sun and Yujing Li},
title = {Surface Molecular Encapsulation with Cyclodextrin in Promoting the Activity and Stability of Fe Single-Atom Catalyst for Oxygen Reduction Reaction},
year = {2023},
journal = {Energy & Environmental Materials},
volume = {6},
number = {2},
keywords = {oxygen reduction reaction, singe atom catalyst, stability, surface molecular engineering},
url = {https://www.sciopen.com/article/10.1002/eem2.12346},
doi = {10.1002/eem2.12346},
abstract = {Fe single-atom catalysts (Fe-SACs) have been extensively studied as a highly efficient electrocatalyst toward the oxygen reduction reaction (ORR). Nonetheless, they suffer from stability issue induced by dissolution of Fe metal center and the OH− blocking. Herein, a surface molecular engineering strategy is developed by using β-cyclodextrins (CDs) as a localized molecular encapsulation. The CD-modified Fe-SAC (Fe-SNC-β-CD) shows obviously improved activity toward the ORR with 0.90 V, 4.10 and 4.09 mA cm−2 for E1/2, J0 and Jk0.9, respectively. Meanwhile, the Fe-SNC-β-CD shows the excellent long-term stability against aggressive stress and the poisoning. It is confirmed through electrochemical investigation that modification of β-CD can, on one hand, regulate the atomic Fe coordination chemistry through the interaction between the CD and FeNx moiety, while on the other mitigate the strong adsorption of OH− and function as protective barrier against the poisoning molecules leading to enhanced ORR activity and stability for the Fe-SACs. The molecular encapsulation strategy demonstrates the uniqueness of post-pyrolysis surface molecular engineering for the design of single-atom catalyst.}
}