4 years ago

Au Nanoparticles Modified Co/Titania Nanotubes as Electrocatalysts for Borohydride Oxidation

A. Jagminienė, A. Zabielaitė, A. Balčiūnaitė, E. Norkus, D. M. F. Santos, L. Tamašauskaitė-Tamašiūnaitė, I. Stankevičienė
Gold-cobalt catalysts were deposited on the surface of titania nanotubes (TiO2-NTs) via galvanic displacement technique. The catalysts were characterized using field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and inductively coupled plasma optical emission spectroscopy. The electrocatalytic activity of the Au(Co)/TiO2-NTs catalysts was examined in respect to the oxidation of BH4− ions in an alkaline media by cyclic voltammetry and chronoamperometry. It was found that the Au(Co)/TiO2-NTs catalysts with Au loadings in the range of 10 up to 59 µgAu cm−2 had a higher activity compared to that of Co/TiO2-NTs and bare Au. A direct NaBH4-H2O2 single fuel cell was constructed with the Au(Co)/TiO2-NTs catalysts as anode and Pt as the cathode. The fuel cell exhibited an open circuit voltage of ca. 1.9 V and peak power densities up to 217 mW cm−2 at 25 °C. The highest specific peak power density of 16.3 kW g−1Au was obtained when employing Au(Co)/TiO2-NTs with the Au loading of 10 µgAu cm−2 as the anode catalyst.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/fuce.201600168

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