期刊
CHEM
卷 5, 期 10, 页码 2642-2656出版社
CELL PRESS
DOI: 10.1016/j.chempr.2019.07.006
关键词
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资金
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015R1A2A1A10055991]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2017M3D1A1039553]
- Presidential Post-Doc. Fellowship Program through the National Research Foundation (NRF) of Korea - Ministry of Education [2016R1A6A3A04008134(RIAM0417-20180002)]
- Lotte Chemical
- National Research Foundation of Korea [2018H1A2A1062608] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Redox-active organic materials (ROMs) have recently attracted significant attention for redox flow batteries (RFBs) to achieve green and cost-efficient energy storage. In particular, multi-redox ROMs have shown great promise, and further tailoring of these ROMs would yield RFB technologies with the highest possible energy density. Here, we present a phenazine-based catholyte material, 5,10-bis(2-methoxyethyl)-5,10-dihydrophenazine (BMEPZ), that undergoes two single-electron redox reactions at high redox potentials (-0.29 and 0.50 V versus Fc/Fc(+)) with enhanced solubility (0.5 M in acetonitrile), remarkable chemical stability, and fast kinetics. Moreover, an all-organic flow battery exhibits cell voltages of 1.2 and 2.0 V when coupled with 9-fluorenone (FL) as an anolyte. It shows capacity retention of 99.94% per cycle over 200 cycles and 99.3% per cycle with 0.1 M and 0.4 M BMEPZ catholyte, respectively. Notably, the BMEPZ/FL couple results in the highest energy density (similar to 17 Wh L-1) among the non-aqueous all- organic RFBs reported to date.
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