Silver nanoparticles supported on TiO2 nanotubes as active catalysts for ethanol oxidation

Silver (Ag) nanoparticles were successfully assembled in self-organized TiO2 nanotubes by the polyol process. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy as well as Fourier transform infrared spectroscopy were used for the characterization of surface morphology, phase composition, microstructure, and valent state of the AgTiO2 catalysts. It was found that these catalysts showed improved dispersion and increased catalytically active sites. The electrocatalytic properties of AgTiO2 catalysts for ethanol oxidation were investigated by cyclic voltammetry. The results showed that the Ag doped anatase TiO2 composites exhibited excellent catalytic activity in electrocatalytic ethanol oxidation in alkaline media. Hence, the composites look promising in direct ethanol fuel cell applications.

The TEM micrographs for Ag doped TiO2 nanotubes annealed at 723 K and the cyclic voltammograms in acidic and alkaline media.Figure optionsDownload high-quality image (51 K)Download as PowerPoint slideResearch highlights
► Silver nanoparticles deposited on TiO2 nanotubes as catalysts.
► A small amount of Ag atoms can diffuse into the lattice of rutile TiO2.
► The AgTiO2/723 K coatings have the best catalytic activity.