Enhancing the H2 evolution from water–methanol solution using Mn2+–Mn+3–Mn4+ redox species of Mn-doped TiO2 sol–gel photocatalysts
| Autor: | Getsemani Morales-Mendoza, Luis Lartundo-Rojas, Alejandro Pérez-Larios, Agileo Hernández-Gordillo, Ricardo Gómez, A. Mantilla |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Anatase
Materials science Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Manganese 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Specific surface area Photocatalysis Methanol 0210 nano-technology Sol-gel |
| Zdroj: | Catalysis Today. 266:9-16 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2015.12.029 |
| Popis: | Mn-doped TiO 2 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 m 2 /g while in bare TiO 2 sample 64 m 2 /g only. Mn-doped TiO 2 solids evaluated in the production of H 2 showed higher photoactivities (1376 μmol h −1 g −1 for 1.0%wt. Mn and 1736 μmol h −1 g −1 for 5.0%wt. Mn) in comparison with the bare TiO 2 semiconductor (264 μmol h −1 g −1 ). This improvement in photoactivity is suggested as a combination of charge separators Mn 2+ , Mn 3+ and Mn 4+ which can act simultaneously as electron and hole traps respectively. The synergetic effect between the manganese oxidation states and electrons transferred from methanol toward TiO 2 particles favored the H 2 production. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect