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Fig 9. a) Representative charge/discharge curves of an all-organic polymer RFB using poly(TEMPO-co-PEGMA) and poly(BODIPY-co-TEGSt) operating in the range of 1.4 V and 2.15 V, showing cycles 3 to 5. b) Long-term battery cycling at a constant current of 0.25 mA. An electrolyte of propylene carbonate with 0.5 M Bu4NClO4 was used. Reprinted with permission from [119]. 6.6 Polyoxometalate RFB Pratt et al. presented a flow battery containing vanadium- and tungsten-polyoxometalates (POMs), in which the POMs undergo multi-electron reactions [120,121]. POMs are suitable for electrochemical energy storage applications because they are often stable over a wide range of temperatures, exhibit multi-electron transfer with high kinetics [122]. Also, oxidation or reduction of POMs is usually accompanied by proton or cation transfer, a mechanism that avoids the generation of highly charged radicals [123]. In the publication by Pratt et al. two three-electron POM redox couples ([SiV(V)3W(VI)9O40]7- / [SiV(IV)3W(VI)9O40]10- and Page 34 of 63PDF Image | Redox Flow Batteries Concepts Chemistries
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