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Background ∆𝐻° =∑𝐻° −∑𝐻° (1.27) 𝑓(𝑝𝑟𝑜𝑑𝑢𝑐𝑡) 𝑓(𝑟𝑒𝑎𝑐𝑡𝑎𝑛𝑡) ∆𝐻° = −965.5 − (−238.810) = −726.69 𝑘𝐽/𝑚𝑜𝑙𝑒 Substituting both values of Gibbs free energy and enthalpy in both equations 1.26 and 1.27 can obtain the maximum voltage and the maximum efficiency of the direct methanol fuel cell at standard condition. Therefore, the max voltage of the cell: ∆𝐺 ° 702.45 𝐸 = 𝑁 × 𝐹 = 6 × 96,493 = 1.21 𝑣𝑜𝑙𝑡 And the max efficiency of the cell: Δ𝐺° −702.45 𝜂𝑚𝑎𝑥 = ∆𝐻° = −726.69 ≈ 96 % The polarization curve, which is a plot of the cell voltage versus the current density, is the most common technique that has been used to characterize the performance of a fuel cell [9, 19, 22]. Figure 1.10 shows the polarization curve of the fuel cell [9]. Figure 1.10 Fuel cell theoretical efficiency and losses [9] In figure 1.10 the voltage reached its maximum (open circuit voltage) without any load applied to the circuit. When load is connected to the circuit, the voltage starts to drop across the membrane. Sirhan AL-Batty Page 40PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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