Extended visible light harvesting and boosted charge carrier dynamics in heterostructured zirconate–FeS2 photocatalysts for efficient solar water splitting
Por:
Huerta-Flores A.M., Mora-Hernández J.M., Torres-Martínez L.M., Moctezuma E., Sánchez-Martínez D., Zarazúa-Morín M.E., Wickman B.
Publicada:
1 ene 2018
Resumen:
Limited visible light absorption, slow charge transference, and high recombination are some of the main problems associated with low efficiency in photocatalytic processes. For these reasons, in the present work, we develope novel zirconate–FeS2 heterostructured photocatalysts with improved visible light harvesting, effective charge separation and high photocatalytic water splitting performance. Herein, alkali and alkaline earth metal zirconates are prepared by a solid state reaction and coupled to FeS2 through a simple wet impregnation method. The incorporation of FeS2 particles induces visible light absorption and electron injection in zirconates, while the appropriate coupling of the semiconductors in the heterostructure allows an enhanced charge separation and suppression of the recombination. The obtained heterostructures exhibit high and stable photocatalytic activity for water splitting under visible light, showing competitive efficiencies among other reported materials. The highest hydrogen evolution rate (4490 µmol g-1 h-1) is shown for BaZrO3–FeS2 and corresponds to more than 20 times the activity of the bare BaZrO3. In summary, this work proposes novel visible light active heterostructures for efficient visible light photocatalytic water splitting. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
Filiaciones:
Huerta-Flores A.M.:
Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66455, Mexico
Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #6, San Luis Potosí, S.L.P. 78290, Mexico
Mora-Hernández J.M.:
Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, CONACYT - Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66455, Mexico
Torres-Martínez L.M.:
Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66455, Mexico
Moctezuma E.:
Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava #6, San Luis Potosí, S.L.P. 78290, Mexico
Sánchez-Martínez D.:
Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66455, Mexico
Zarazúa-Morín M.E.:
Departamento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66455, Mexico
Wickman B.:
Division of Chemical Physics, Department of Physics, Chalmers University of Technology, Gothenburg, 412 96, Sweden
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