We demonstrate a new approach to synthesizing high-activity electrocatalysts for the O2reduction reaction with ultra low Pt content. The synthesis involves placing a small amount of Pt, the equivalent of a monolayer, on carbon-supported niobium oxidenanoparticles (NbO2 or Nb2O5). Rotating disk electrode measurements show that the Pt/NbO2/C electrocatalyst has three times higher Pt mass activity for the O2reduction reaction than a commercial Pt/C electrocatalyst. The observed high activity of the Pt deposit is attributed to the reduced OH adsorption caused by lateral repulsion between PtOH and oxide surface species. The new electrocatalyst also exhibits improved stability against Pt dissolution under a potential cycling regime (30000 cycles from 0.6 V to 1.1 V). These findings demonstrate that niobium-oxide (NbO2) nanoparticles can be adequate supports for Pt and facilitate further reducing the noble metal content in electrocatalysts for the oxygenreduction reaction.
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Physical Chemistry Chemical Physics
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