RhPt Flowerlike Bimetallic Nanocrystals with Tunable Composition as Superior Electrocatalysts for Methanol Oxidation

For the first time, composition-tunable, high-yield, RhPt flowerlike bimetallic nanocrystals were successfully synthesized through an aqueous solution approach. The electrocatalytic activity of these RhPt nanoalloys toward methanol oxidation was investigated and compared to the activity of commercial Pt black and commercial Ru₅₀Pt₅₀/C. The RhPt flowerlike bimetallic nanoallys have shown composition-dependent and superior catalytic properties relative to those of commercial Pt black and commercial Ru₅₀Pt₅₀/C. The peak current density and mass current value of Rh₁₉Pt₈₁ nanoalloys are 0.75 mA cm^–2 and 0.12 mA μg^–1, respectively. For commercial Pt black, they are 0.48 mA cm^–2 and 0.074 mA μg^–1, and for commercial Ru₅₀Pt₅₀/C, they are 0.28 mA cm^–2 and 0.10 mA μg^–1. Moreover, the chronoamperometric measurements show that the RhPt flowerlike nanoalloys have excellent stability over commercial Pt black and commercial Ru₅₀Pt₅₀/C