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Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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5.1.3 Conclusions In summary, a cost-effective formulation of dPEI-based positive electrolyte for VFRB was successfully demonstrated in terms of thermal stability and energy density, as 3M V(V) in 3M H2SO4 in presence of 0.6% w/v of dPEI at 40oC only slightly decreases to 2.7-2.8 M. The overall performance as a single cell device is improved, as the stabilization of the V (V) ions done by the dPEI increases the energy density to 19.5 W h L-1 at 60oC and the excellent electrochemical performance for 40 cycles (ca. 88 % of energy efficiency) from 30 to 60oC of operational temperature could boost the marketability of VRFB technology. 78

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