Saturday, October 31, 2015

ALD of Pd Nanoparticles on TiO2 Nanotubes for Ethanol Electrooxidation

Direct Ethanol Fuel Cells DEFCs are considered one of the promising renewable energy sources, as they can produce electrical energy directly from the ethanol electrooxidation reaction. The efficiency of ethanol electrooxidation is a big question from research point of view. Here French and Canadian researchers show how ALD Pd nano particles grown in anodic titanium oxide nanotubes can be used for Ethanol Electrooxidation.

Atomic Layer Deposition of Pd Nanoparticles on TiO2 Nanotubes for Ethanol Electrooxidation: Synthesis and Electrochemical Properties

Loïc Assaud, Nicolas Brazeau, Maïssa K. S. Barr, Margrit Hanbücken, Spyridon Ntais, Elena A. Baranova, and Lionel Santinacc

ACS Appl. Mater. Interfaces, Article ASAP
DOI: 10.1021/acsami.5b06056

Palladium nanoparticles are grown on TiO2 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 TiO2 nanotubes leading to the formation of well-defined and highly dispersed Pd nanoparticles. The electrooxidation of ethanol on Pd clusters deposited on TiO2 nanotubes shows 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 TiO2 nanotubes is modified by annealing at 450 °C in air.