Surface engineering on MnO2 nanorods by La single atoms to accelerate oxygen reduction kinetics

Surface engineering, which modulates the electronic structure and adsorption/desorption properties of electrocatalysts, is one of the key strategies for improving the catalytic performance. Herein, we demonstrate a facile solid-phase reaction for surface engineering of MnO 2 to boost the oxygen redu...

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Bibliographic Details
Published in:Rare metals 2024, Vol.43 (9), p.4302-4311
Main Authors: He, Zhang-Long, Wang, Liu-Qi, Jiang, Min, Xie, Jia-Nan, Liu, Shan, Ren, Jin-Can, Sun, Rui, Lv, Wen-Bin, Guo, Wei-Bin, Liu, Yu-Ling, Li, Bing, Liu, Qi, He, Hao
Format: Article
Language:English
Subjects:
Atomic structure
Biomaterials
Chemical reduction
Chemistry and Materials Science
Density functional theory
Electrocatalysts
Electronic structure
Energy
Engineering
Kinetics
Manganese dioxide
Materials Engineering
Materials Science
Metal air batteries
Metallic Materials
Nanorods
Nanoscale Science and Technology
Original Article
Oxygen reduction reactions
Physical Chemistry
Reaction kinetics
Solid phases
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Summary:Surface engineering, which modulates the electronic structure and adsorption/desorption properties of electrocatalysts, is one of the key strategies for improving the catalytic performance. Herein, we demonstrate a facile solid-phase reaction for surface engineering of MnO 2 to boost the oxygen reduction kinetics. Via reaction with surface hydroxy groups, La single atoms with loading amount up to 2.7 wt% are anchored onto α-MnO 2 nanorods. After surface engineering, the oxygen reduction reaction (ORR) kinetics is significantly improved with the half-wave potential from 0.70 to 0.84 V, the number of transferred electrons from 2.5 to 3.9 and the limiting current density from 4.8 to 6.0 mA·cm −2 . In addition, the catalyst delivers superior discharge performance in both alkaline and neutral metal–air batteries. Density functional theory (DFT) calculations reveal that atomic La modulates the surface electronic configuration of MnO 2 , reduces its d-band center and thus lowers the OOH* and O* reaction energy barrier. This work provides a new route for rational design of highly active electrocatalyst and holds great potential for application in various catalytic reactions. Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-024-02767-w