A novel electrolytes for redox flow batteries: Cerium andchromium couples in aqueous system
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In this study, Ce/Cr redox flow battery system (RFB), which had redox pair indifferent oxidation states, was performed in aqueous acidic medium for thefirst time in the literature. At Ce/Cr RFB system, optimization of acid (H2SO4),and active ion (Cr(III) and Ce(III) ions) concentration were executed by usingdifferential pulse voltammetry and electrochemical impedance spectroscopymethods. The mass transfer type for positive electrolyte was determined byusing of cyclic voltammetric method. Both chemical stability and changes onsurface morphology of pencil graphite electrode were analyzed with scanningelectron microscope. Cyclic charge/discharge test was performed for this novelelectrolyte composition. Cell potential and the highest discharge capacityvalues were also determined as 1.52 V and 21.2 mAh L1, respectively, at0.8 mA cm2charge current density and 0.2 mA cm2discharge current den-sity. Obtained data in this work can open a new perspective for the using ofthe alternative redox couples for the redox flow batteries.
SourceInternational Journal of Energy Research
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