One‐Step Cationic Grafting of 4‐Hydroxy‐TEMPO and its Application in a Hybrid Redox Flow Battery with a Crosslinked PBI Membrane

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 re...

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Bibliographic Details
Published in:ChemSusChem 2017-08, Vol.10 (16), p.3193-3197
Main Authors: Chang, Zhenjun, Henkensmeier, Dirk, Chen, Ruiyong
Format: Article
Language:English
Subjects:
anion-exchange membrane
Anolytes
Benzimidazoles - chemistry
Cations
Crosslinking
Cyclic N-Oxides - chemistry
Electric Power Supplies
Electrochemical analysis
Electrochemistry
electrolyte
Energy management
energy storage
Hydroxylamine - chemistry
Membranes, Artificial
Methylation
polybenzimidazole
Polybenzimidazoles
Polymers - chemistry
Reaction kinetics
Rechargeable batteries
redox flow batteries
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Summary: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. Grafting and crosslinking: Through cationic grafting of a redox active nitroxyl radical and crosslinking an anion‐exchange PBI (polybenzimidazole) membrane, we improve the cycling properties of a hybrid flow battery utilizing low‐cost components (organic active compound, zinc, anion‐exchange membrane).
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201701060