Abstract
A novel electrocatalyst structure of carbon nanotubes (CNT) coated with thin SnO 2 and Pt (Pt/(CNT@SnO 2)) is reported. The CNT@SnO 2 composites with a thin shell (about 2 nm) are prepared by a simple chemical-solution method. The Pt/(CNT@SnO 2) catalyst is prepared by first microwave heating H 2PtCl 6 in NaOH ethylene glycol solution and then depositing Pt nanoparticles onto CNT@SnO 2 composites. High-resolution transmission electron microscopy and X-ray diffraction show that crystalline SnO 2 of about 2 nm thickness is coated uniformly on the surface of the CNTs. Pt nanoparticles of about 3.2 nm in diameter are homogenously dispersed on the SnO 2 surface. Electrochemical studies were carried out using cyclic voltammetry and chronoamperometry. The results showed that Pt/(CNT@SnO 2) catalysts have much higher catalytic activity and CO-tolerance for ethanol electro-oxidation than that of Pt/CNT.
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