Synthesis of SrTiO3 submicron cubes with simultaneous and competitive photocatalytic activity for H2O splitting and CO2 reduction
| Autor: | Jiaqin Liu, Yucheng Wu, Haoshan Wei, Yong Zhang, Xueru Zhang, Jiewu Cui, Yan Wang, Qin Yongqiang, Jingyi Cai, Xia Shu, Elena A. Baranova |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen General Chemical Engineering chemistry.chemical_element General Chemistry Methane chemistry.chemical_compound Adsorption chemistry Chemical engineering Photocatalysis Water splitting Fourier transform infrared spectroscopy Spectroscopy Electrochemical reduction of carbon dioxide |
| Zdroj: | RSC Advances. 10:42619-42627 |
| ISSN: | 2046-2069 |
| Popis: | Single crystalline strontium titanate (SrTiO3) submicron cubes have been synthesized based on a molten salt method. The submicron cubes showed superior photocatalytic activity towards both water splitting and carbon dioxide reduction, in which methane (CH4) and hydrogen (H2) were simultaneously produced. The average production rate of methane up to 8 h is 4.39 μmol g−1 h−1 but drops to 0.46 μmol g−1 h−1. However, the average production rate of hydrogen is 14.52 before 8 h but then increases to 120.23 μmol g−1 h−1 after 8 h. The rate change of the two processes confirms the competition between the H2O splitting and CO2 reduction reactions. Band structure and surface characteristics of the SrTiO3 submicron cubes were characterized by diffuse reflective UV-Vis spectroscopy, Mott–Schottky analysis, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The results reveal that the simultaneous and competitive production of methane and hydrogen is due to a thermodynamics factor, as well as the competition between the adsorption of carbon dioxide and water molecules on the surface of the faceted SrTiO3. This work demonstrates that SrTiO3 photocatalysts are efficient in producing sustainable fuels via water splitting and carbon dioxide reduction reactions. |
| Databáze: | OpenAIRE |
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