Metal oxide nanoparticle (NP) supports of both good conductivity and stability have the potential to enhance both the reaction activity and stability of the loaded electrocatalysts. In this paper, a facile two-step approach to disperse Pt nanoparticles on the surface of an IrO NP support (Pt/IrO) was developed. Physical characterization by x-ray diffraction spectroscopy and transmission/scanning electron microscopy suggests a good dispersion of the Pt NPs. The temperature effect (from 293 to 353 K) of oxygen reduction reaction on Pt/IrO was studied by using a rotating ring disk electrode The results show that although the kinetic current density on Pt/IrO is close to that on commercial Pt/C at room temperature, the apparent activation energy (E) in the former case is much lower, suggesting a much higher activity at elevated temperatures. The superiority in E is attributed to the electron interaction between Pt and the IrO support, as supported by the change of surface chemical state given by x-ray photo-electron spectroscopy.
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