01

Pore diameter 09) / pm Fig. 1 Specific pore volume distributions of various acetylene blacks.

agglomerate of the carbon support (the primary pore). 3 This result means that the PFSI was distributed both inside and outside the agglomerates with AB1, AB2, AB3, and AB, but it was distributed only outside the agglomerates with AB18. The schematic internal structure of catalyst layer is illustrated in Fig. 2, one with AB18 and the other with AB. AB18 was the carbon support in our study of the PFSI distribution in the catalyst layer.2 The best performance was achieved with AB on the effect of carbon supports. The Pt particles inside the agglomerates of AB18 did not take part in the reaction in the catalyst layer because the PFSI was not distributed there. On the other hand, AB has large primary pores able to be distributed the PFSI. The Pt particles both inside and

Pt-supported carbon (Pt-C)

agglomerate

agglomerate

Pt-supported carbon (Pt-C)

agglomerate

0 0

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