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varying the chlorine electrode exchange current density should have the largest effect on cell performance at 90% efficiency. Figure 9a confirms this expectation. Figure 9b shows that the Nafion thickness is somewhat important to cells operating at high efficiencies. This is consistent with Figure 6a, which shows the resistive overpotential through the membrane as the second most important loss at 90% efficiency. Notice from Figures 9c and 9d that cell performance at 90% efficiency is only very slightly dependent on gas pressures or diffusion layer thickness: this is due to the unimportance of mass transport at low current densities. Figure 9: Dependence of power density at 90% galvanic efficiency on deviation from Base Case engineering parameters. Power densities are displayed as a function of each engineering parameter with the others held at the Base EP values: iH = 250 mA , iCl = 10 0 cm20 mA , ε = 3 μm, and l = 0.178 cm (7 mil). (a) Chlorine exchange current density, iCl . (b) cm2 0 Nafion membrane thickness, l. (c) Bubble thin film thickness, ε. (d) The cell pressure, pCl2 = pH2 . Base case is circled. The black (upper) dots represent the ”Best OPs” for a given set of EPs, while the red (lower) dots represent the ”Worst OPs” for the same set of EPs. It is interesting to use the model to predict the absolute best performance one might expect from an rHCFC because it provides a target for an experimental R&D program. We input so-called “More Optimal” values of all of the parameters – the best values of the EPs that we believe are plausibly attainable with further R&D – and calculated the ideal operating conditions for these EPs. For the More Optimal EPs, we set iH0 = 600 22PDF Image | Regenerative Hydrogen Chlorine Fuel Cell for Grid-Scale
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