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Chapter 3 Impregnated membranes for DMFCs at high methanol concentrations prepared by hot pressing two E-TEK commercial electrodes on both sides of the membranes at 10bar. At least two MEAs were prepared and measured for each methanol concentration. Minimum 70 polarization curves were measured for each MEA and the values presented in this work are their av- erage values. SPPEK1.4 1.0 1.0 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0.0 0.0 0 300 600 900 1200 1500 1800 Current density [mA/cm2] SPPEK1.4-PE 1M 3M 6M Figure 7. Polarization curves of SPPEK1.4 and SPPEK1.4-PE membranes at various methanol concentrations. Figure 7 presents polarization curves of SPPEK1.4 and SPPEK1.4-PE mem- branes at various methanol concentrations. The open cell voltage (OCV) values of each membrane decreases at higher methanol concentration due to the increasing driving force for the methanol cross-over. In all graphs, there are clear regions of activation, ohmic and concentration polarization. The concentration polarization is significant at 1M, but becomes lower at 3M and 6M. For SPPEK1.4 membrane, it seems that the performance at 6M is slightly worse than at 3M. However, for the SPPEK1.4-PE, the perform- ance at 6M is better than 3M. In fact, the impregnated membrane can be used up to 1600-1700 mA/cm2 at high methanol concentrations. This is also obvious when comparing the power density curves of the membranes at various methanol concentrations (see Fig. 8). SPPEK1.4-PE composite membrane shows superior performance than SPPEK1.4 membrane at every concentration and at low and high current density regions of the curves due to its significantly low methanol cross-over and reasonable proton conduc- tivity. Since the composite membrane has significantly low methanol cross- 47 1M 6M 3M 0 300 600 900 1200 1500 1800 Current density [mA/cm2] Cell voltage [V] Cell voltage [V]PDF Image | Development of membrane materials for direct methanol fuel cells
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