Solar simulated hydrogen evolution using cobalt oxide nanoclusters deposited on titanium dioxide mesoporous materials prepared by evaporation induced self-assembly process
| Autor: | Ranjit T. Koodali, Chia-Ming Wu, Luther Mahoney, Jonas Baltrusaitis, Rui Peng |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Nanoclusters Mesoporous organosilica chemistry.chemical_compound Fuel Technology chemistry Titanium dioxide Mesoporous material Cobalt oxide Cobalt Hydrogen production |
| Zdroj: | International Journal of Hydrogen Energy. 40:10795-10806 |
| ISSN: | 0360-3199 |
| Popis: | Cobalt containing TiO2 mesoporous materials were prepared by Evaporation-Induced Self-Assembly (EISA) process. The resulting mesoporous materials were characterized using powder X-ray diffraction (XRD), nitrogen physisorption, Raman spectroscopy, diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). The photocatalytic activities of the mesoporous materials were investigated for hydrogen production under solar simulated conditions. The non-modified TiO2 sample produced only 4 μmole H2/g catalyst after 4 h of irradiation. In contrast, the Co containing mesoporous materials produced significantly higher amounts of hydrogen under identical conditions. The highest solar hydrogen evolution (634 μmole H2/g catalyst after 4 h of irradiation) was from the Co-TiO2-0.5 material. The physico-chemical characterization results indicate that the Co2+ ions are dispersed as oxide species on the surface of the mesoporous titania. These cobalt surface species act as trap sites preventing recombination of the charge carriers as shown by PL measurements. The addition of Co2+ ions to the synthesis mixture prevents the formation of anatase-to-rutile which favorably permits more solar hydrogen production. |
| Databáze: | OpenAIRE |
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