Journal
RSC ADVANCES
Volume 10, Issue 37, Pages 21839-21844Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra03424j
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Funding
- National Natural Science Foundation of China [21573025, 21773018]
- China Scholarships Council [201808320086]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX19_0684]
- Qing Lan project of Jiangsu Province
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Water-soluble 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derivatives have been frequently utilized as catholytes for aqueous redox flow batteries to achieve cost-effective renewable energy storage. However, fundamental knowledge of TEMPO derivatives is still largely underdeveloped. Herein, a comprehensive study on the properties of TEMPO derivatives has been conducted in aqueous electrolytes. The results confirm that the redox potential, diffusion coefficient, electron transfer rate constant and solubility are clearly influenced by functional groups of TEMPO derivatives and supporting electrolytes. The charge-discharge cycling performance is evaluated using a symmetric redox flow battery configuration. The capacity decay for TEMPO-based catholytes is mainly derived from the crossover of the oxidized state. The presented study not only advances an in-depth understanding of TEMPO-based RFB applications, but also highlights the challenge of crossover of redox-active TEMPO derivative molecules applied in aqueous RFBs.
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