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Polymers 2021, 13, x FOR PEER REVIEW Polymers 2021, 13, 1386 10 of 15 9 of 14 100 (a) 80 60 40 20 (a) SPSf (b) SPSf-SiO2 (c) SPSf-SiO2_sulf (a) (b) (c) 00 0.2 0.4 0.6 0.8 1 Voltage (V) 150 (b) 120 90 60 30 (a) (b) (c) (a) SPSf (b) SPSf-SiO2 (c) SPSf-SiO2_sulf Crossover current density (mA cm-2) Crossover current density (mA cm-2) 00 0.2 0.4 0.6 0.8 1 Voltage (V) Figure 5. Comparison of methanol crossover current densities, using a 5 M methanol solution, for the SPSf and composite Figure 5. Comparison of methanol crossover current densities, using a 5 M methanol solution, for the SPSf and composite SPSf membranes at (a) 30 °C and (b) 60 °C. SPSf membranes at (a) 30 ◦C and (b) 60 ◦C. The methanol cross-over equivalent current (the current resulting from the oxidation The methanol cross-over equivalent current (the current resulting from the oxidation of crossed methanol) for the different MEAs confirms the trend of the OCV values, since of crossed methanol) for the different MEAs confirms the trend of the OCV values, since the lowest current was observed for the sPSf-SiO2_sulf membrane, with values of 40 and the lowest current was observed for the sPSf-SiO2_sulf membrane, with values of 40 and −2 65 mA·cm −2at 0.9 V and 30 and 60 °◦C, respectively. The significant differences between 65 mA·cm at 0.9 V and 30 and 60 C, respectively. The significant differences between this membrane and the other two samples used for comparison could be ascribed not only this membrane and the other two samples used for comparison could be ascribed not only to the increased diffusion path length of MeOH/H2O generally observed in the composite to the increased diffusion path length of MeOH/H2O generally observed in the compositePDF Image | Properties of Methanol Transport for Direct Methanol Fuel Cells
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