A symmetric aqueous redox flow battery based on viologen derivative |
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| Affiliation: | 1. Institute of Functional Nano & Soft Materials, Soochow University, 199 Renai Road, Suzhou Industrial Park, Suzhou, Jiangsu 215123, China;2. Materials Science and Engineering Program and Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA;1. MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China;2. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225000, China |
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| Abstract: | Due to the diversity and feasibility of structural modification for organic molecules, organic-based redox flow batteries (ORFBs) have been widely investigated, especially in aqueous solution under neutral circumstance. In this work, a symmetric aqueous redox flow battery (SARFB) was rationally designed by employing a bipolar redox active molecule (N,N'-dimethyl-4,4-bipyridinium diiodide, MVI2) as both cathode and anode materials and combining with an anion exchange membrane. For one MVI2 flow battery, MV2+/ MV·+ and I−/I3− serve as the redox couples of anode and cathode, respectively. The MVI2 battery with a working voltage of 1.02 V exhibited a high voltage efficiency of 90.30% and energy efficiency of 89.44% after 450 cycles, and crossover problem was prohibited. The comparable conductivity of MVI2 water solution enabled to construct a battery even without using supporting electrolyte. Besides, the bipolar character of MVI2 battery with/without supporting electrolyte was investigated in the voltage range between −1.2 V and 1.2 V, showing excellent stable cycling stability during the polarity-reversal test. |
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| Keywords: | Aqueous redox flow battery Bipolar redox active molecule Symmetric redox flow battery Prohibited crossover problem High coulombic efficiency |
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