Topotactic Epitaxy of SrTiO3 Mesocrystal Superstructures with Anisotropic Construction for Efficient Overall Water Splitting.
Peng ZhangTomoya OchiMamoru FujitsukaYasuhiro KoboriTetsuro MajimaTakashi TachikawaPublished in: Angewandte Chemie (International ed. in English) (2017)
The higher-order structures of semiconductor-based photocatalysts play crucial roles in their physicochemical properties for efficient light-to-energy conversion. A novel perovskite SrTiO3 mesocrystal superstructure with well-defined orientation of assembled cubic nanocrystals was synthesized by topotactic epitaxy from TiO2 mesocrystals through a facile hydrothermal treatment. The SrTiO3 mesocrystal exhibits three times the efficiency for the hydrogen evolution of conventional disordered systems in alkaline aqueous solution. It also exhibits a high quantum yield of 6.7 % at 360 nm in overall water splitting and even good durability up to 1 day. Temporal and spatial spectroscopic observations revealed that the synergy of the efficient electron flow along the internal nanocube network and efficient collection at the larger external cubes produces remarkably long-lived charges for enhanced photocatalysis.
Keyphrases
- visible light
- aqueous solution
- room temperature
- quantum dots
- high resolution
- photodynamic therapy
- molecular dynamics
- single cell
- molecular docking
- gold nanoparticles
- mass spectrometry
- anaerobic digestion
- high efficiency
- replacement therapy
- metal organic framework
- molecular dynamics simulations
- municipal solid waste