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happening. Moreover, hydrogen evolution reaction occurring in the negative side of the battery remains a mayor challenge to overcome, as well as, increases the V2+/V3+ redox reaction kinetics to not be the limiting factor of the working cell. A schematic representation and working principle of the VRFB is shown in Figure 2.7. As with other redox flow battery systems, the VRFB is made up of a cell or stack, the size of which determines the power rating of the system (kW), electrolytes in external reservoirs the determine the energy rating (kWh), and a control system that ensures operation within safe limits to ensure a long cycle life. Figure 2.7. Schematic representations of the VRFB. 2.7.1 Cell potential The standard cell potential (E0) is the difference of the two electrode potentials (positive or cathode and negative or anode), which forms the voltage of that cell. The cell potential can be defined by the following equation: (2.19) Where E0 (Cell) is the standard cell potential (under 1M, 1 bar and at an ambient temperature), E+ is the standard reduction potential for the reaction occurring at the positive half-cell, and E- is the standard reduction potential for the oxidation 36PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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