To resolve the problems of the lack of cost-effective replacements of Pt catalysts and CO poisoning of Pt electrocatalysts for polymer electrolyte membrane fuel cells, we developed a state-of-the-art electrocatalyst in which a Pt layer with a thickness of a few molecular layers is spread over SnO 2 nanoparticles on multiwalled carbon nanotubes. The electrocatalysts showed not only excellent activity in H adsorption/desorption, but also a lower potential for initiating the electro-oxidation of CO in comparison with that of conventional Pt ∕ carbon catalysts.
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Waki et al. (2005) studied this question.
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