期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 27, 页码 14859-14869出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03396
关键词
perovskite titanate; TiO2; photocatalysis; quantum dot sensitized solar cells; hollow spheres
资金
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP) [NRF-CRP8-2011-04]
- BMBF (Bundesministerium fur Bildung und Forschung) [03SF0482C]
- Project Establishment of the Laboratory of Photoactive Nanocomposite Materials by Government of the Russian Federation [14.Z50.31.0016]
We describe a general synthesis strategy, which combines sol-gel and hydrothermal processes, for the large-scale synthesis of porous perovskite titanates spheres with tunable particle size and inner structures. Amorphous hydrous TiO2 solid spheres (AHTSS) are first synthesized by a sol-gel method and are then used as precursor and template for the subsequent hydrothermal reaction with alkaline earth metal ions in an alkaline medium. This strategy can be generalized to synthesize porous spheres of various perovskite titanates (i.e., SrTiO3, BaTiO3, and CaTiO3) consisting of single-crystalline nanocubes. By controlling the textural properties (i.e., size, porosity, and structure) of AHTSS, perovskite titanates with tunable Size and inner structures are selectively synthesized. The underlying formation mechanism is manifested by XRD and TEM to involve in situ crystallization or Ostwald ripening during the hydrothermal process. The obtained porous SrTiO3 spheres present superior performance in photocatalytic oxygen evolution and CdSe-sensitized mesoscopic solar cells.
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