Co-doping schemes to enhance H₂ evolution under visible light irradiation over SrTiO₃:Ni/M (M聽=聽La or Ta) prepared by spray pyrolysis

详细信息	查看全文 | 推荐本文 |

• 作者：Hyun Woo Kang ; Sung Nam Lim ; Seung Bin Park ; ^{SeungBinPark@kaist.ac.kr} ; ^{SeungBinPark@kaist.edu}
• 关键词：Photocatalyst ; Hydrogen production ; Visible light ; Spray pyrolysis ; Co-doping
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：7
• 页码：5540-5549
• 文件大小：831 K

摘要

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.