H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

M. Suárez-Quezada; G. Romero-Ortiz; J. E. Samaniego-Benítez; V. Suárez; A. Mantilla

doi:10.1016/j.fuel.2018.11.155

H₂ production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

M. Suárez-Quezada, G. Romero-Ortiz, J. E. Samaniego-Benítez, V. Suárez, A. Mantilla

Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada (CICATA), Unidad Legaria

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

Photocatalysts based on calcined ZnAl layered double hydroxides were obtained by coprecipitation and the subsequent thermal treatments at different temperatures. The calcined materials were characterized and its photocatalytic behavior was evaluated in the water splitting reaction in presence of UV irradiation. According to the XRD analysis, there was detected the presence of Zn as hexagonal ZnO in all the samples, as well as Al forming ZnAl₂O₄ and Zn₆Al₂O₉, depending on the temperature of calcination employed. H₂ yield was higher as the annealing temperature was increased due to the formation of the heterojunctions of ZnO with the Zn₆Al₂O₉ and ZnAl₂O₄ oxides, reaching the maximum value in the sample annealed at 600 °C. Some decay in the activity was observed in the sample calcined at 700 °C, probably due to the higher recombination rate of the photogenerated charge carriers in that heterojunction in comparison with that obtained at 600 °C.

Original language	English
Pages (from-to)	262-269
Number of pages	8
Journal	Fuel
Volume	240
DOIs	https://doi.org/10.1016/j.fuel.2018.11.155
State	Published - 15 Mar 2019

Keywords

Calcined LDH
Heterojunction
Hydrogen
Photocatalyst
Water splitting
ZnAl mixed oxides

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10.1016/j.fuel.2018.11.155

Cite this

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title = "H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH",

abstract = "Photocatalysts based on calcined ZnAl layered double hydroxides were obtained by coprecipitation and the subsequent thermal treatments at different temperatures. The calcined materials were characterized and its photocatalytic behavior was evaluated in the water splitting reaction in presence of UV irradiation. According to the XRD analysis, there was detected the presence of Zn as hexagonal ZnO in all the samples, as well as Al forming ZnAl2O4 and Zn6Al2O9, depending on the temperature of calcination employed. H2 yield was higher as the annealing temperature was increased due to the formation of the heterojunctions of ZnO with the Zn6Al2O9 and ZnAl2O4 oxides, reaching the maximum value in the sample annealed at 600 °C. Some decay in the activity was observed in the sample calcined at 700 °C, probably due to the higher recombination rate of the photogenerated charge carriers in that heterojunction in comparison with that obtained at 600 °C.",

keywords = "Calcined LDH, Heterojunction, Hydrogen, Photocatalyst, Water splitting, ZnAl mixed oxides",

author = "M. Su{\'a}rez-Quezada and G. Romero-Ortiz and Samaniego-Ben{\'i}tez, {J. E.} and V. Su{\'a}rez and A. Mantilla",

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doi = "10.1016/j.fuel.2018.11.155",

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T1 - H2 production by the water splitting reaction using photocatalysts derived from calcined ZnAl LDH

AU - Suárez-Quezada, M.

AU - Romero-Ortiz, G.

AU - Samaniego-Benítez, J. E.

AU - Suárez, V.

AU - Mantilla, A.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Photocatalysts based on calcined ZnAl layered double hydroxides were obtained by coprecipitation and the subsequent thermal treatments at different temperatures. The calcined materials were characterized and its photocatalytic behavior was evaluated in the water splitting reaction in presence of UV irradiation. According to the XRD analysis, there was detected the presence of Zn as hexagonal ZnO in all the samples, as well as Al forming ZnAl2O4 and Zn6Al2O9, depending on the temperature of calcination employed. H2 yield was higher as the annealing temperature was increased due to the formation of the heterojunctions of ZnO with the Zn6Al2O9 and ZnAl2O4 oxides, reaching the maximum value in the sample annealed at 600 °C. Some decay in the activity was observed in the sample calcined at 700 °C, probably due to the higher recombination rate of the photogenerated charge carriers in that heterojunction in comparison with that obtained at 600 °C.

AB - Photocatalysts based on calcined ZnAl layered double hydroxides were obtained by coprecipitation and the subsequent thermal treatments at different temperatures. The calcined materials were characterized and its photocatalytic behavior was evaluated in the water splitting reaction in presence of UV irradiation. According to the XRD analysis, there was detected the presence of Zn as hexagonal ZnO in all the samples, as well as Al forming ZnAl2O4 and Zn6Al2O9, depending on the temperature of calcination employed. H2 yield was higher as the annealing temperature was increased due to the formation of the heterojunctions of ZnO with the Zn6Al2O9 and ZnAl2O4 oxides, reaching the maximum value in the sample annealed at 600 °C. Some decay in the activity was observed in the sample calcined at 700 °C, probably due to the higher recombination rate of the photogenerated charge carriers in that heterojunction in comparison with that obtained at 600 °C.

KW - Calcined LDH

KW - Heterojunction

KW - Hydrogen

KW - Photocatalyst

KW - Water splitting

KW - ZnAl mixed oxides

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