期刊
ACS CATALYSIS
卷 8, 期 8, 页码 7213-7221出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b01103
关键词
lithium-oxygen batteries; polyoxometalate; nature-inspired molecule; dispersion catalyst; water oxidation catalyst
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016R1C1B2011442]
- UNIST (Ulsan National Institute of Science and Technology) [1.180014.01]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据