Polyoxometalate as a Nature-Inspired Bifunctional Catalyst for Lithium-Oxygen Batteries
- Authors
- Lee, Jun-Seo; Lee, Cheolmin; Lee, Jae-Yun; Ryu, Jungki; Ryu, Won-Hee
- Issue Date
- Aug-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- lithium-oxygen batteries; polyoxometalate; nature-inspired molecule; dispersion catalyst; water oxidation catalyst
- Citation
- ACS CATALYSIS, v.8, no.8, pp 7213 - 7221
- Pages
- 9
- Journal Title
- ACS CATALYSIS
- Volume
- 8
- Number
- 8
- Start Page
- 7213
- End Page
- 7221
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4404
- DOI
- 10.1021/acscatal.8b01103
- ISSN
- 2155-5435
- Abstract
- Nature-inspired molecules present a family of affordable, environmentally friendly catalysts to enable and enhance next-generation energy storage systems. In this study, we report the use of cobalt-based polyoxometalates (Co-POMs) with an oxo-bridged tetracobalt active site, which is reminiscent of the natural oxygen-evolving complex, as an efficient and stable redox catalyst for Li-O-2 batteries. Interestingly, Co-POMs exhibit catalytic activity for both oxygen evolution and reduction reactions (OER and ORR, respectively) under a certain condition when it forms a stable dispersion of molecular aggregates, which can be controlled by the types of electrolyte solvents and exposure to light. As a result of the optimized OER/ORR bifunctional activity, Li-O-2 cells facilitated by Co-POM redox reactions successfully achieve improved efficiency and a longer cycle life in comparison to reference cells. The reversibility of the Li-O-2 reactions in the presence of the bifunctional Co-POM catalysts is confirmed by ex situ characterizations.
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