Journal
ACS ENERGY LETTERS
Volume 2, Issue 2, Pages 411-416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00655
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Funding
- German Research Council (DFG)
- European Fonds for Regional Development (EFRE)
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Hybrid-flow batteries are a suitable storage technology for green electricity generated by renewable sources such as wind power and solar energy. Redox-active organic compounds have recently been investigated to improve the traditional metal- and halogen-based technologies. Here we report the utilization of a 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) derivative that is in particular designed for application in semiorganic zinc hybrid-flow batteries. The TEMPO derivative is synthesized and electrochemically characterized via cyclic voltammetry and rotating disc electrode measurements. This derivative features a high solubility in aqueous electrolytes; thus, volumetric capacities above 20 Ah L-1 are achieved. The fabricated hybrid-flow batteries feature over 1100 consecutive charge-discharge cycles at constant capacity retention, and current densities up to 80 mA cm(-2) are applied.
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