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- W2519853022 abstract "The need for electrochemical energy storage increases along with the growing share of fluctuating renewables for power generation. The all-vanadium redox flow battery (VRB) has experienced increasing attention in this context. Its electrolyte membrane is a key component, yet currently perfluorinated materials (e.g., Nafion) are mainly used in VRBs, which have neither been designed for this particular application, nor are they cost-effective. The cross-over of redox active vanadium species impairs cell efficiency, in particular in case of thin Nafion membranes with low ohmic resistance. Here, we present a potentially generic concept of a bifunctional ion-conducting membrane prepared by radiation grafting with sulfonic acid proton exchange sites and amidoxime moieties. The crossover of vanadium-ions is reduced four-fold in the presence of amidoxime groups without markedly impairing the conductivity of the membrane. A VRB cell containing such membrane shows increased energy efficiency and negligible capacity fading over 122 charge / discharge cycles compared to cells with Nafion membrane, which showed a loss of discharge capacity of around 35% after 35 cycles and considerable electrolyte imbalance." @default.
- W2519853022 created "2016-09-23" @default.
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- W2519853022 date "2016-01-01" @default.
- W2519853022 modified "2023-09-26" @default.
- W2519853022 title "Bifunctional Ion-Conducting Polymer Electrolyte for the Vanadium Redox Flow Battery with High Selectivity" @default.
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- W2519853022 doi "https://doi.org/10.1149/2.0441613jes" @default.
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