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Another promising route would be a reactant that serves as both the redox couple and as the electrolyte. The performance of cells with liquid reactants is highly sensitive to the combination of electrode and flow-field designs, especially with respect mass-transport losses, since the diffusion coefficients of liquids is typically five orders-of-magnitude lower than gases. Thus, the focus here has been on the demonstration of PRAC-based solutions. During discharge, V negolyte is circulated on the liquid electrode and humidified air is fed to the gas electrode. Zoom In Zoom Out Reset image size. However, water balance at all times is not required, and the system may be designed to accommodate changes in the concentration of the reactant in the PRAC.

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