Abstract
This research aimed to investigate the effect of the calcination temperature and the CeO2 to nanotubes (CNTs) weight ratio on the performance of Pt/CeO2−CNTs hybrid nanotube for methanol oxidation. The catalysts were prepared by microwave-assisted polyol process. Electrochemical results showed that Pt/CeO2−CNTs hybrid nanotube catalyst with the calcination temperature of 280 °C and the weight ratio of 4:4 is more active and stable than others. The properties of catalyst were characterized by X-ray diffraction, high-resolution transmission electron microscopy, and scanning transmission electron microscopy-energy dispersive spectroscopy elemental mapping. The increased catalytic efficiency of Pt in the Pt/CeO2−CNTs hybrid nanotube catalysts resulted from its smaller Pt nanoparticles and good contact with CeO2 and CNTs simultaneously. A novel Pt/CeO2−CNTs hybrid nanotube catalyst with CNTs and CeO2-supported Pt nanoparticles has been successfully prepared by the liquid-phase chemical deposition method. The Pt nanoparticles are homogeneously distributed over CeO2−CNTs-−HN supports through adsorbing adjacent to CeO2, which are homogeneously distributed over CNTs. Further, the Pt nanoparticles are inserted into voids formed by CeO2 other than deposited on CeO2 directly, contacting with CeO2 and carbon simultaneously.
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