Enhanced oxygen reduction reaction on PtPb ordered intermetallic nanoparticle/TiO2/carbon black in acidic aqueous solutions

• The PtPb/TiO2 was synthesized on conductive carbon black (CB).
• The formation of PtPb was characterized with XRD, STEM, TEM and XPS.
• The ORR activities of the PtPb/TiO2/CB were investigated.
• PtPb/TiO2/CB showed higher ORR catalytic activity than Pt/CB.

The electrochemical oxygen reduction reaction (ORR) was accelerated on PtPb ordered intermetallic nanoparticles (NPs) deposited on titanium oxide (TiO2)/carbon black (CB) and compared with the benchmarked rate on Pt NPs/CB. Immobilization of the PtPb NPs on TiO2 was a key factor to enhance ORR activity on the PtPb NP surface. The electric interaction between the PtPb NPs and TiO2 improved the electrocatalytic activity for ORR in a 0.1 M HClO4 acidic solution.

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