화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.44, No.45, 24653-24666, 2019
Highly photoactive TiO2 microspheres for photocatalytic production of hydrogen
In this study, the photocatalytic activity in hydrogen production of a TiO2 catalyst with hierarchical structure and microsphere morphology was tested. This catalyst was synthesised by hydrolysis and condensation processes from a Ti(OBut)(4) precursor and calcined at 150 degrees C, 400 degrees C and 630 degrees C. Hydrogen production of the subsequent photocatalysts rose by two and three orders of magnitude after the incorporation of Au or Pt particles by photo-deposition. The microspheres with and without metal modification were characterised by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD), Raman, Brunauer-Emmett-Teller (BET) surface area, Fourier transform infrared spectroscopy (FTIR) and diffuse reflectance measurements. The highest production rates were obtained for the metal-modified photocatalysts calcined at 400 degrees C. Hydrogen production increased with Au loading, attaining a rate of 1118 mu mol.h(-1) for the 1.5 wt% Au photocatalyst. However, the highest production rate in the case of Pt was attained with just 0.27 wt% and was almost twice as high as that obtained with Au, 2125 mu mol.h(-1). When compared with previous studies by our team under the same conditions, this high production rate, obtained with a very low Pt loading, was only exceeded by the reference Aeroxide P25 TiO2 catalyst with a Pt loading greater than 1.5 wt%. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.