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addition, the increasing potential with current step increases more rapidly at the positive electrode (Figure 4.5c). The difference in the increment of potential between the positive and negative electrode stabilized above 64 mA cm-2 indicating that the concentration overpotential dominates at those current densities using a flow speed of 70 mL min-1. The values obtained during the charge were always lower which is more likely due to the evolution of hydrogen and oxygen. Figure 4.5. –a) Potential profile of VRFB at different current densities (8, 16, 32, 64 and 128 mA cm-2), b) iR corrected potential increase observed for each step of current density and c) differences between the potential increase of the positive and negative electrode for each current step. SoC and flow were around 50 % and 70 mL min-1, respectively. 65PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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