Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1276843 | International Journal of Hydrogen Energy | 2012 | 10 Pages |
Two photocatalysts, SrTiO3:Ni/La and SrTiO3:Ni/Ta, were prepared by continuous spray pyrolysis. The effects of the co-dopants on hydrogen evolution over the uncalcined photocatalysts were evaluated under visible light irradiation. The co-doping of La3+ into SrTiO3:Ni transformed the charge structure and increased the presence of Ni2+ at the expense of Ni3+ in the host lattice structure. The co-doping of Ta5+ into SrTiO3:Ni also increased the Ni2+/Ni3+ ratio around the Ti4+ ions. Compared with SrTiO3:Ni, SrTiO3:Ni/La showed a 3 times greater rate of hydrogen evolution under visible light irradiation and SrTiO3:Ni/Ta, a 4 times greater rate. The co-doping levels required for optimized hydrogen evolution over SrTiO3:Ni/La and SrTiO3:Ni/Ta prepared by spray pyrolysis were smaller than those prepared by other methods. Spray pyrolysis also produced particles with large surface areas and high roughnesses.
► SrTiO3:Ni/M (M = La or Ta) photocatalyst was prepared by spray pyrolysis. ► Co-doping of La on SrTiO3:Ni increased hydrogen evolution rate 3 times. ► Co-doping of Ta on SrTiO3:Ni increased hydrogen evolution rate 4 times. ► Ni, La and Ta ions each have specific roles in affecting photocatalyst.