Direct methanol fuel cells (DMFCs) are attracting much attention as clean and efficient power sources. Pt-Ru alloy anode has been developed for industrial applications. However, the resources of both Pt and Ru are limited on our planet. In the present work, Pt-Ce0 2 composite anodes were prepared. We examined the influence of surface activity of substrate Ce0 2 on anode performance of Pt-Ce0 2 composites for development of high quality anodes in DMFCs. The surface area of Ce0 2 particles was

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... nged by a control of dropping speed of cerium nitrate aqueous solution into ammonium carbonate aqueous solution. The peak current density of methanol oxidation on Pt(30wt% )-Ce0 2 composite anodes increased with an increase of surface area ofCe0 2 up to 51m 2 /g. The current density ofPt(30wt%)-Ce0 2 (Ce0 2 : 51m 2 /g) composite anode was 1.8 times higher than that on commercially available Pt-Ru alloy anode. On the other hand, the current density ofPt(5wt%)-Ce0 2 (Ce0 2 : 51m 2 /g) was also higher than that on Pt-Ru alloy anode. Those results indicate that the anode performance on Pt-Ce0 2 /CB can be maximized and Pt content in Pt-Ce0 2 /CB can be minimized by a design of interface between Pt and active Ce0 2 .