Double nanoparticles of Pt and SnO
2 with different Pt/Sn ratios highly dispersed on Ketjen Black (denoted as Pt/SnO
2/CB) were prepared by the modified Bönnemann method. The average size and standard deviation of the Pt and SnO
2 nanoparticles were 3.1±0.5 nm and 2.5±0.3 nm for the Pt/SnO
2(3:1)/CB, 3.0±0.5 nm and 2.6±0.3 nm for Pt/SnO
2(1:1)/CB, 2.8±0.5 nm and 2.5±0.3 nm for Pt/SnO
2(1:3)/CB. The Pt/SnO
2(3:1)/CB showed the highest specific activity and lowest overpotential for ethanol oxidation reaction (EOR) in the present study, and was superior to a Pt/CB electrode. These were ascribable to the synergistic effect of Pt and SnO
2 nanoparticles.
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