期刊
CHEM
卷 5, 期 7, 页码 1861-1870出版社
CELL PRESS
DOI: 10.1016/j.chempr.2019.04.021
关键词
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资金
- National Science Foundation of China [91534203, 21720102003, 21878281, 21506201]
- International Partnership Program of Chinese Academy of Sciences [21134ky5b20170010]
- US DOE through PNNL [DE-AC05-76RL01830, 304500]
- Massachusetts Clean Energy Technology Center
- Harvard School of Engineering and Applied Sciences
The massive-scale integration of renewable electricity into the power grid is impeded by its intrinsic intermittency. The aqueous organic redox flow battery (AORFB) rises as a potential storage solution; however, the choice of positive electrolytes is limited, and the aqueous-soluble organic positive redox-active species reported to date have short lifetimes. Here we report a stable organic molecule for the positive terminal, 4-(3-(trimethylammonio)propoxy)-2,2,6,6-tetramethylpiperidine-1-oxyl (TMAP-TEMPO) chloride, exhibiting high (4.62 M) aqueous solubility. When operated in a practical AORFB against a negative electrolyte comprising BTMAP-viologen at neutral pH, the flow cell displayed an open-circuit voltage of 1.1 volts and a Coulombic efficiency of >99.73%. The capacity retention rate is among the highest of all-organic AORFBs reported to date, at 99-993% per cycle over 1,000 consecutive cycles; the temporal capacity fade rate of 0.026% per h is independent of concentration.
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