Z-schematic water splitting by the synergistic effect of a type-II heterostructure and a highly efficient oxygen evolution catalyst
| Autor: | Shuang Li, Xiaoyun Li, Haihua Hu, Degui Qian, Peng Wang, Jiaqi Pan, Lingbo Xu, Wenzhe Zhu, Ping Lin, Chaorong Li, Can Cui |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Oxygen evolution Nanowire General Physics and Astronomy Nanoparticle Heterojunction 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Redox 0104 chemical sciences Surfaces Coatings and Films Catalysis Chemical engineering Photocatalysis Water splitting 0210 nano-technology |
| Zdroj: | Applied Surface Science. 441:61-68 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2018.01.216 |
| Popis: | Artificial Z-scheme system inspired by the natural photosynthesis in green plants has attracted extensive attention owing to its advantages such as simultaneously wide range light absorption, highly efficient charge separation and strong redox ability. In this paper, we report the synthesis of a novel all-solid-state direct Z-scheme photocatalyst of Ag3PO4/CeO2/TiO2 by depositing Ag3PO4 nanoparticles (NPs) on CeO2/TiO2 hierarchical branched nanowires (BNWs), where the CeO2/TiO2 BNWs act as a novel substrate for the well dispersed nano-size Ag3PO4. The Ag3PO4/CeO2/TiO2 photocatalyst exhibits excellent ability of photocatalytic oxygen evolution from pure water splitting. It is suggested that the Z-scheme charge transfer route between CeO2/TiO2 and Ag3PO4 improves the redox ability. On the other hand, the cascade energy level alignment in CeO2/TiO2 BNWs expedites the spatial charge separation, and hence suppresses photocatalytic backward reaction. However, it is difficult to realize a perfect excitation balance in Ag3PO4/CeO2/TiO2 and the composite still surfers photo-corrosion in photocatalysis reaction. Nevertheless, our results provide an innovative strategy of constructing a Z-scheme system from a type-II heterostructure and a highly efficient oxygen evolution catalyst. |
| Databáze: | OpenAIRE |
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