Abstract
In this study, in order to examine the relationship between d-band center of platinum (Pt) in Pt-based catalysts and catalytic activity for methanol electrochemical oxidation in an alkaline aqueous solution, Pt-based nanoparticle catalysts were synthesized and then their electrocatalytic activity and d-band center of Pt in the Pt-based catalyst surfaces were analyzed with X-ray photoelectron spectroscopy. Finally, the plots of electrocatalytic activity vs. d-band center of Pt atoms on the catalyst surface were obtained. The plots exhibited a so-called volcano-type correlationship (Fig. 1), indicating that there is an optimum electronic state of Pt atoms on the catalyst surfaces for the methanol oxidation. In addition, the existence of the optimum electronic state was also confirmed from the relationship between the change in the d-band center due to the elution of the second element from the Pt-based alloy catalyst and the catalytic activity.Fig.1 Relationship between d-band center of the Pt atoms in Pt NPs/CB and Pt-based NPs/CB and current density at -0.1 V for the methanol oxidation. Figure 1
Published Version
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