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...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.展开更多
基金supported by the National Key R&D Program of China(Nos.2016YFA0202500 and 2016YFB0901502)the National Natural Science Foundation of China(NSFC,Nos.21673243,51771094 and 21805141)the Ministry of Education(MOE)of China(No.B12015)and Tianjin High-Tech(No.18JCZDJC31500)。
文摘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.
