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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Figure 5.5. – Evaluation of electrochemical properties and dose effect of the dPEI- containing electrolytes through the VO2+/VO2+ redox couple (scan rate 1 mVs-1). Regarding the dose effect, a higher additive concentration up to 1.2 % w/v leads to a dramatic decrease of both anodic and cathodic peaks current (i.e. 21% and 23 %, respectively). No effect had been found using a 2.5% dose of the additive in electrochemical activity. This is probably attributed to the decrease in mass transport with a higher additive dose due to an increment of viscosity of the electrolyte. Therefore, the activity of dPEI in 0.6% w/v concentration demonstrates a superior performance in term of electrocatalytic feature in comparison with fresh electrolyte. 74

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