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Figure 1. 4. A schematic of a simple VRFB cell assembly. All parts are tightened to each other by bolts and nuts. Electrodes are electrically conductive and porous materials, which enable the electrolyte to trade electrons with external electrical circuit. The potential difference exerted on the system by the external circuit enforces the reaction direction in each electrolyte by obligating one side to give electrons and the other to take them. They are conventionally made out of graphite due to the high conductivity, stability, and corrosion resistance of this material. However, they possess poor electrochemical activity in vanadium redox reactions, which increases the overpotential required to charge and discharge VRFBs and hinders their energy efficiency and power density. [12–15] Numerous studies have recommended different electrode treatments, such as chemical, [12,15– 22] thermal, [14,19,23] plasma [14] and electrochemical, [20,24] to improve the kinetics of the redox reaction. Moreover, Several studies have suggested using alternative cheap materials for electrodes. [25–29] A schematic of the flow field-electrode assembly is illustrated in Figure 1. 5. 7PDF Image | Analysis of Fluid Flow in Redox Flow Batteries
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