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Title: Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts
Authors: Pérez Larios, Alejandro
Hernández Gordillo, Agileo
Morales Mendoza, Getsemani
Lartundo Rojas, Luis
Mantilla, Ángeles
Gómez, Ricardo
Keywords: hydrogen production
Mn-doped titania
Mn-doped photocatalysts
Sol–gel TiO2
Mn charge separator
manganese oxidation states
Issue Date: May-2016
Publisher: Elsevier
Citation: Pérez Larios A., Hernández Gordillo A., Morales Mendoza G., Lartundo Rojas L., Mantilla A. & Gómez R. (2016). Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts. Catalysis Today, Volume 266, Pages 9-16. ISSN 0920-5861. DOI:
Series/Report no.: Catalysis Today;Vol. 266, pp 9-16
Abstract: Abstract Mn-doped TiO2 materials synthetized by the sol–gel method were obtained and tested in the photocatalytic hydrogen production from a methanol–water solution. The Mn amount was varied between 1.0–10.0%wt. Powder X-ray diffraction patterns and Raman spectra of the synthesized solids showed the anatase as the predominant crystalline phase. A high specific surface area was found in the Mn-doped sol–gel catalysts between 88–136 m2/g while in bare TiO2 sample 64 m2/g only. Mn-doped TiO2 solids evaluated in the production of H2 showed higher photoactivities (1376 μmol h−1 g−1 for 1.0%wt. Mn and 1736 μmol h−1g −1 for 5.0%wt. Mn) in comparison with the bare TiO2 semiconductor (264 μmol h−1g −1). This improvement in photoactivity is suggested as a combination of charge separators Mn2+, Mn3+ and Mn4+ which can act simultaneously as electron and hole traps respectively. The synergetic effect between the manganese oxidation states and electrons transferred from methanol toward TiO2 particles favored the H2 production.
Description: Artículo
ISSN: 0920-5861
Appears in Collections:2414 Artículos

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