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Synergistic Catalysis of the Lattice Oxygen and Transition Metal Facilitating ORR and OER in Perovskite Catalysts for Li-O-2 Batteries

Authors
Agyeman, Daniel AdjeiZheng, YongpingLee, Tae-HyeongPark, MihuiTamakloe, WilsonLee, Gi-HyeokJang, Ho WonCho, KyeongjaeKang, Yong-Mook
Issue Date
1-1월-2021
Publisher
AMER CHEMICAL SOC
Keywords
surface lattice oxygen; perovskite LaMnO3; Li-O-2 battery; collective redox; surface atomic structure; Mn termination; La termination; electrocatalyst
Citation
ACS CATALYSIS, v.11, no.1, pp.424 - 434
Indexed
SCIE
SCOPUS
Journal Title
ACS CATALYSIS
Volume
11
Number
1
Start Page
424
End Page
434
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/129435
DOI
10.1021/acscatal.0c02608
ISSN
2155-5435
Abstract
The role of catalysts in aprotic Li-O-2 batteries remains unclear. To identify the exact catalytic nature of oxide catalysts, a precisely surface-engineered model catalyst, perovskite (LaMnO3), was investigated for oxygen reduction reaction/oxygen evolution reaction (ORR/OER) in both aqueous and aprotic solutions. By using integrated theoretical and experimental approaches, we explicitly show that H+-ORR/OER catalytic activity on transition-metal sites fails to completely describe the electrochemical performance of LaMnO3 catalysts in aprotic Li-O-2 batteries, whereas the collective redox of the lattice oxygen and transition metal on the catalyst surface during initial Li2O2 formation determines their discharge capacity and charge overpotential. This work applies oxide catalyst design to tailor both the surface lattice oxygen and the transition-metal arrangement for an aprotic Li-O-2 battery. The optimized model catalyst shows good performance for Li-O-2 batteries under both oxygen and ambient air (real air) conditions.
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