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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1786| Synthesis and evaluation of the phases SrFe2O4 and SrFe12O19 for Hydrogen production from photocathalytic water spliting. | |
| JAIME ANTONIO JIMENEZ MIRAMONTES MIGUEL JESUS MELENDEZ ZARAGOZA JESUS MANUEL SALINAS GUTIERREZ VIRGINIA HIDALINA COLLINS MARTINEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Water splitting | |
| The use of materials whose properties are suitable for hydrogen production by the water splitting via photocatalysis is one of the most promising strategies to solve the current energy demand. These materials must be photoactive under sunlight, inexpensive, eco-friendly and have a band gap that fulfill the water dissociation potential of 1.23 eV. Ferrite systems present adequate optical properties to be used in this type of process, so strontium ferrite was synthesized in two of its most known phases to evaluate its performance in the evolution of hydrogen by water splitting under visible light irradiation. The strontium ferrite in its spinel phase SrFe2O4 and the hexagonal phase SrFe12O19 have active band gaps in the visible light spectrum of ~ 2 eV. Synthesis of the two phases from nitrates were achieved by using the modified Pechini’s method at temperatures of 700-900 °C. The characterization of the materials consisted in the use of different techniques such as X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and UV-vis spectroscopy. The diffractograms obtained by XRD indicate the presence of pure phases of the strontium ferrite and by applying the Scherrer’s equation crystallite sizesof approximately 15 and 30 nm for the spinel and hexagonal phases were obtained, respectively. The two phases have a morphology of sintered irregular polygons with a BET surface area of 18 m²/g for the spinel and 14 m²/g for the hexagonal and present a band gap of 1.77 eV and 1.82 eV, respectively.The photocatalytic evaluation was performed by monitoring the evolution of hydrogen through gas chromatography, showing the best performance for the spinel phase of 730 μmol H2/gcat·h. | |
| 2017 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Synthesis and evaluation of the phases SrFe2O4 and SrFe12O19 for Hydrogen production.pdf | 1.38 MB | Adobe PDF | Visualizar/Abrir |