Journal
CHEMSUSCHEM
Volume 10, Issue 16, Pages 3193-3197Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701060
Keywords
anion-exchange membrane; electrolyte; energy storage; polybenzimidazole; redox flow batteries
Funding
- KIST Europe
- Korea Evaluation Institute of Industrial Technology (KEIT) [N0001795] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By using a one-step epoxide ring-opening reaction between 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4-hydroxy-TEMPO) and glycidyltrimethylammonium cation (GTMA(+)), we synthesized a cation-grafted TEMPO (g(+)-TEMPO) and studied its electrochemical performance against a Zn2+/Zn anode in a hybrid redox flow battery. To conduct Cl- counter anions, a crosslinked methylated polybenzimidazole (PBI) membrane was prepared and placed between the catholyte and anolyte. Compared to 4-hydroxy-TEMPO, the positively charged g(+)-TEMPO exhibits enhanced reaction kinetics. Moreover, flow battery tests with g(+)-TEMPO show improved Coulombic, voltage, and energy efficiencies and cycling stability over 140 cycles. Crossover of active species through the membrane was not detected.
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