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where the fitting parameters have these values: a1 = −0.0178, b1 = 0.891, c1 = 2.58, d1 = 4.20, a2 = 0.000389, b2 = 0.00398, c2 = 2.55, and d2 = 2.23. Figure 3: The conductivity of Nafion 120 vs. HCl(aq) concentration, measured by Yeo and McBreen with our fit to their data superimposed [Eq. 15] at five different temperatures. Figure 3 shows the data from Yeo and McBreen and the fit using Equation 15. The difference between the resistive overpotential using the real conductivity data versus using the fitted curve is well below 10% for concentrations of interest at 250 mA , or ± 5 mV in voltage terms. The hydrogen electrode overpotential, ηH There is an activation overpotential at the hydrogen electrode, but, because we can neglect the concentration-depletion effect due to relatively fast mass transport, we use a concentration-independent form of the Butler-Volmer equation: i = iH0 (exp(−αfηH)−exp((1−α)fηH)), [16] where iH is the exchange current density at the hydrogen electrode in mA , α is the transfer 0 cm2 coefficient, and ηH is the activation overpotential at the hydrogen electrode in volts (14). For the model, we set the value of the transfer coefficient for both electrodes equal to 0.5. We invert Equation 16 numerically to obtain ηH as a function of i. For a given reaction, i0 can vary by many orders of magnitude depending on the catalyst. For example, iCl on 0 flatPtisoforder1 mA,whereasonTaitisoforder10−6 mA. ItisworthnotingthatPt cm2 cm2 has been shown to have long-term stability issues in this application (7), and ruthenium dioxide based compounds are more likely to be used as a catalyst material. 11 cm2PDF Image | Regenerative Hydrogen Chlorine Fuel Cell for Grid-Scale
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