Site-selectively Pt-decorated PdPt bimetallic nanosheets characterized by electrocatalytic property for methanol oxidation

Abstract In this work, a facile synthetic method for site-selectively Pt-decorated PdPt bimetallic nanosheets (S-Pt-PdPt BN ) has been described. The size, structure, and composition distribution of the synthesized S-Pt-PdPt BN were determined by transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The electrocatalytic activity of these bimetallic nanosheets was examined for the oxidation of methanol in an acidic solution. The electrochemically active surface area (ECSA) of S-Pt-PdPt BN was 0.842 cm 2 . This value is slightly lower than the ECSA (1.012 cm 2 ) of the commercial Pt/C (Alpha, Pt 10%) electrode. Interestingly, even though the ECSA of the S-Pt-PdPt BN /C was smaller than that of the commercial Pt/C, the forward peak current density of the former (2.95 mA cm −2 ) was ca. 1.5 times higher than that of the latter (2.05 mA cm −2 ). Moreover, the current density of the S-Pt-PdPt BN /C catalysts was high even after 800 s of continuous electrocatalysis at 0.5 V. This current density is six times that of commercial Pt/C catalysts. Thus, the synthesized S-Pt-PdPt BN exhibited significantly enhanced electrocatalytic activity and better stability than the commercial Pt/C catalyst for methanol oxidation.