Enhancing the H2 evolution from water-methanol solution using Mn2+-Mn+3-Mn4+ redox species of Mn-doped TiO2 sol-gel photocatalysts
Por:
Perez-Larios, Alejandro, Hernandez-Gordillo, Agileo, Morales-Mendoza, Getsemani, Lartundo-Rojas, Luis, Mantilla, Angeles, Gomez, Ricardo
Publicada:
15 may 2016
Resumen:
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-1g-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. © 2016 Elsevier B.V. All rights reserved.
Filiaciones:
Perez-Larios, Alejandro:
Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Area Catalisis, Grp ECOCATAL, Ave San Rafael Atlixco 189, Mexico City 09340, DF, Mexico
Hernandez-Gordillo, Agileo:
Univ Nacl Autonoma Mexico, Inst Invest Mat Catedras CONACyT, Circuito Exterior SN,Ciudad Univ, Mexico City 04510, DF, Mexico
Morales-Mendoza, Getsemani:
Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Area Catalisis, Grp ECOCATAL, Ave San Rafael Atlixco 189, Mexico City 09340, DF, Mexico
Lartundo-Rojas, Luis:
Inst Politecn Nacl, Ctr Nanociencias & Micro & Nanotecnol, Luis Enrique Erro S-N, Mexico City 07738, DF, Mexico
Mantilla, Angeles:
Inst Politecn Nacl, CICATA Legaria, Ave Legaria 694, Mexico City 11500, DF, Mexico
Gomez, Ricardo:
Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Area Catalisis, Grp ECOCATAL, Ave San Rafael Atlixco 189, Mexico City 09340, DF, Mexico
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