Abstract
The single molybdenum oxide (MoO 2 ) crystals down to 5 nm in diameter on carbon (denoted as C-MoO 2 ) are synthesized based on ion-exchange principle for the first time. The structures, morphologies, chemical and electrocatalytic performances of as-synthesized nanomaterials are characterized by physical, chemical and electrochemical methods. The results indicate that electrocatalysts made with Pt nanoparticles supporting on C-MoO 2 (denoted as Pt/C-MoO 2 ) are highly active and stable for oxygen reduction reaction (ORR) in fuel cells. A mass activity of 187.4 mA mg −1 Pt at 0.9 V is obtained for ORR, which is much higher than that on commercial Pt/C (TKK) electrocatalyst (98.4 mA mg −1 Pt ). Furthermore, the electrochemical stability of Pt/C-MoO 2 is more excellent than that of Pt/C (TKK). The origin of the improvement in catalytic activity can be attributed to the synergistic or promotion effect of MoO 2 on Pt. The improvement in electrochemical stability is due to the strong interaction force between Pt and MoO 2 . ► MoO 2 single crystals down to 5 nm are synthesized through ion-exchange route. ► The size and dispersion of MoO 2 are controlled by its precursor concentrations. ► The MoO 2 crystals are chemically and electrochemically stable in acidic media. ► The MoO 2 crystals give highly promotion effect on Pt electrocatalyst.
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