Conclusions

In the pores (0.04 to 1.0 jtm) where PFSI existed, specific pore volumes of the M&E assemblies with acetylene blacks were larger than those with furnace blacks. The reaction areas of the cells with the proper PFSI content increased linearly with specific pore volume. Improvement of PEFC performance was achieved by optimal carbon support with a larger pore volume able to distribute the PFSI over Pt inside the agglomerate.

Current density at 850 mV decreased with an increase of specific pore volume (< 8 nm). This tendency means that the reaction area of the cell to decrease with an increase in specific pore volume. Improvement of PEFC performance was achieved by optimal carbon support with smaller pore volume (< 8 nm) on the surface of the carbon primary particles so as to decrease Pt absorbed in the small pores where PFSI could not be absorbed.

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