Enhancement of Electrocatalytic Activity for Oxygen Reduction Reaction on TiO2-Supported Pt-Based Intermetallic Compound Catalysts
Potential cycle with PtCu/CB in 0.1 M HClO4 aqueous solution between 0.4-1.1 V (vs. RHE) accelerates ORR (Fig. 1) because of the formation of dealloyed surface of PtCu NPs caused by dissolution of Cu from the surface of PtCu NPs. The dealloyed PtCu/CB showed the highest electrocatalytic activity both in terms of onset potential as well as cathodic current density compared to Pt/CB as well as PtPb/CB and PtNi/CB towards ORR (Fig. 2). The onset potential of PtCu/TiO2 is shifted to higher electric potential by 180 mV compared to Pt/CB (Fig. 3).