Molten salt medium synthesis of wormlike platinum silver nanotubes without any organic surfactant or solvent for methanol and formic acid oxidation†,10.1039/C5CP05641A

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Molten salt medium synthesis of wormlike platinum silver nanotubes without any organic surfactant or solvent for methanol and formic acid oxidation†

Haidong Zhao,Rui Liu,Yong Guo

Physical Chemistry Chemical Physics Pub Date : 10/26/2015 00:00:00 , DOI:10.1039/C5CP05641A

Abstract

In the current research, the Pt_xAg_y (x/y = 86/14, 79/21, 52/48, 21/79, 11/89) nanoparticles (NPs) are synthesized in the KNO₃–LiNO₃ molten salts without using any organic surfactant or solvent. The SEM results suggest that when the content of Ag is higher than 48%, the wormlike Pt_xAg_y nanotubes (NTs) can be synthesized. The diameter of the Pt_xAg_yNTs shows a slow decrease with the increase of Ag content. The TEM and HRTEM results indicate that the growth of hollow Pt_xAg_y NTs undergoes an oriented attachment process and a Kirkendall effect approach. The results of cyclic voltammetry (CV) measurement indicate that the Pt₅₂Ag₄₈ catalyst presents a remarkable enhancement for methanol electrooxidation, while the Pt₈₆Ag₁₄ catalyst prefers electrochemically oxidizing formic acid compared with that of the commercially available Pt black.