Atomic Layer Deposition of Pd Nanoparticles on TiO2 Nanotubes for Ethanol Electrooxidation: Synthesis and Electrochemical Properties
Résumé
Palladium nanoparticles are grown on TiO 2 nanotubes by atomic layer deposition (ALD) and the resulting three dimensional nanostructured catalysts are studied for ethanol electrooxidation in alkaline media. The morphology, the crystal structure and the chemical composition of the Pd particles are fully characterized using scanning and transmission electron microscopies, x-ray diffraction and x-ray photoelectron spectroscopy. The characterization revealed that the deposition proceeds onto the entire surface of the TiO 2 nanotubes leading to the formation of well-defined and highly dispersed Pd nanoparticles. The electrooxidation of ethanol 2 on Pd clusters deposited on TiO 2 nanotubes show not only a direct correlation between the catalytic activity and the particle size but also a steep increase of the response due to the enhancement of the metal-support interaction when the crystal structure of the TiO 2 nanotubes is modified by annealing at 450°C in air.
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