Promoting Photocatalytic Overall Water Splitting by Controlled Magnesium Incorporation in SrTiO3 Photocatalysts
| Autor: | Yen Chun Lin, Chia Min Yang, Kai Han, Bastian Mei, Guido Mul, Ronald P.H. Jong |
|---|---|
| Přispěvatelé: | Photocatalytic Synthesis |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Electronic structure
Materials science General Chemical Engineering Inorganic chemistry Nanoparticle chemistry.chemical_element Quantum yield 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Environmental Chemistry General Materials Science Magnesium Photocatalysis Water splitting 021001 nanoscience & nanotechnology 0104 chemical sciences General Energy chemistry 2023 OA procedure Quantum efficiency Strontium titanate 0210 nano-technology Photocatalytic water splitting |
| Zdroj: | ChemSusChem, 10(22), 4510-4516. Wiley-VCH Verlag |
| ISSN: | 1864-5631 |
| Popis: | SrTiO3 is a well-known photocatalyst inducing overall water splitting when exposed to UV irradiation of wavelengths < 370 nm. However, the apparent quantum efficiency of SrTiO3 is typically low, even when functionalized with nanoparticles of Pt or Ni@NiO. Here, we introduce a simple solid state preparation method to control the incorporation of magnesium into the perovskite structure of SrTiO3. After deposition of Pt or Ni@NiO, the photocatalytic water splitting efficiency of the Mg:SrTiOx composites is up to 20 times higher as compared to SrTiO3 containing similar catalytic nanoparticles, and an apparent quantum yield (AQY) of 10 % can be obtained in the wavelength range of 300 - 400 nm. Detailed characterization of the Mg:SrTiOx composites revealed that Mg is likely substituting the tetravalent Ti-ion, leading to a favorable surface-space-charge layer. This originates from tuning of the donor density in the cubic SrTiO3 structure by Mg-incorporation, and enables high oxygen evolution rates. Nevertheless, interfacing with an appropriate hydrogen evolution catalyst is mandatory and non-trivial, to obtain high performance in water splitting. |
| Databáze: | OpenAIRE |
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