This work is focused on the study of Pt nanoparticles coated self-ordered titania nanotube arrayed electrodes (denoted as Pt/TiO₂-NTs) as efficient platinum/titania nanotubes electrocatalysts for the oxidation of sodium borohydride in an alkaline medium. The Pt/TiO₂-NTs catalysts with different Pt loadings were  fabricated on the titania nanotubes arrayed surface via a facile electrochemical deposition technique. The surface morphology and composition of the Pt/TiO₂-NTs catalysts were investigated using field-emission scanning electron microscopy and energy dispersive X-ray spectroscopy. The electrochemical behaviour of the prepared catalysts was examined towards the oxidation of BH₄ – ions in an alkaline medium by means of cyclic voltammetry. It has been determined that the electrocatalytic activity of Pt/TiO₂-NTs catalysts towards the oxidation of BH₄ – ions depends on the Pt loading in the catalysts and is higher as compared with that of a smooth Pt electrode. It has been found that the Pt/TiO₂-NTs catalyst with a Pt loading of 16.3 μgPt cm^–2 and with deposited Pt nanoparticles ranging from several to 50 nm in size exhibited the highest specific and mass activities for the oxidation reaction of sodium borohydride.

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2017 - Vol.28
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