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Constructing SrTiO3 -TiO2 Heterogeneous Hollow Multi-shelled Structures for Enhanced Solar Water Splitting
Yanze Wei1,2, Jiangyan Wang2, Ranbo Yu1
1Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30, Xueyuan Road, Haidian District, Beijing, 100083, China.
Angewandte Chemie (International Ed. in English)
|December 15, 2018
Summary
Hollow multi-shelled structures (HoMSs) enhance solar energy conversion. SrTiO3-TiO2 HoMSs show fourfold improved water splitting performance due to better light absorption and charge carrier separation.
Area of Science:
- Materials Science
- Photocatalysis
- Solar Energy Conversion
Background:
- Hollow multi-shelled structures (HoMSs) are crucial for improving light absorption in catalysts.
- Solar energy conversion applications benefit significantly from enhanced photocatalytic materials.
Purpose of the Study:
- To synthesize SrTiO3-TiO2 heterogeneous HoMSs using a facile hydrothermal method.
- To investigate the effect of HoMS on the light absorption and water splitting performance of SrTiO3-TiO2 photocatalysts.
Main Methods:
- Hydrothermal crystallization of SrTiO3 onto TiO2 HoMSs.
- Characterization of the broccoli-like SrTiO3-TiO2 heterogeneous HoMSs.
- Evaluation of photocatalytic water splitting performance (H2 and O2 evolution) and apparent quantum efficiency (AQE).
Main Results:
- The synthesized SrTiO3-TiO2 HoMSs exhibited a fourfold increase in overall water splitting performance compared to SrTiO3 nanoparticles.
- H2 production reached 10.6 μmol h⁻¹, and O2 evolution reached 5.1 μmol h⁻¹.
- An apparent quantum efficiency (AQE) of 8.6% at 365 nm was achieved, attributed to enhanced light absorption and charge carrier separation.
Conclusions:
- SrTiO3-TiO2 heterogeneous HoMSs significantly boost solar water splitting efficiency.
- The HoMS architecture and the formation of SrTiO3-TiO2 junctions are key factors for improved photocatalytic activity.
- This study presents a promising strategy for developing advanced photocatalysts for solar energy applications.
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