PtPd nanoframes derived from Pd@PdPt core–shell rhombic dodecahedrals with excellent catalytic performance toward methanol oxidation

Abstract

Here, PtPd nanoframes were prepared by etching Pd@PdPt core–shell rhombic dodecahedrals (RDs) with Fe³⁺ provided by iron chloride hexahydrate (FeCl₃·6H₂O). Based on the experimental results, PtPd nanoframes were formed due to the etching of Pd cores. In terms of catalytic performance, the measured specific activity and mass activity of PtPd nanoframes were 1.11 mA cm⁻² and 840.38 mA mg⁻¹, respectively, which were much higher than those of Pd@PdPt core–shell RDs, Pt black and Pt/C, suggesting the preeminent activity of PtPd nanoframes. Meanwhile, PtPd nanoframes showed better stability compared with Pd@PdPt core–shell RDs, Pt black and Pt/C. The strengthened catalytic properties may be caused by the larger surface area owing to the novel structure and the strong electronic interaction between Pt and Pd.