The performance of PEFC with 0.1 mgPt/cm2 was superior to that with 0.5 mgPt/cm2 by the followings reasons: (i) optimized carbon support and (ii) improvement of the preparation method of the M&E assembly. In the improved method, the PFSI colloid right after formation was adsorbed immediately on Pt-C before coagulation of the colloids. The PFSI was dispersed on Pt-C finely and the thickness of the PFSI on the Pt particles got thinner. Consequently, the reaction area increased and the supply of the reaction gases was improved.

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