Reverse Semi‐Combustion Driven by Titanium Dioxide‐Ionic Liquid Hybrid Photocatalyst
| Autor: | Jesum Alves Fernandes, Jairton Dupont, Marcileia Zanatta, Aitor Gual, José Antonio Pinto, Paulo Eduardo Narcizo de Souza, Emily F. Smith, Brenno A. D. Neto, Isabel Vicente, Muhammad I. Qadir, Sherdil Khan |
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| Přispěvatelé: | DCM - Departamento de Ciência dos Materiais, CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Reaction mechanism
General Chemical Engineering 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences 7. Clean energy Redox carbon monoxide ionic liquids chemistry.chemical_compound Materials Science(all) Energy(all) Imidazolate Imidazole Environmental Chemistry Formate General Materials Science titania Full Paper carbon dioxide Full Papers 021001 nanoscience & nanotechnology 0104 chemical sciences General Energy chemistry Ionic liquid Titanium dioxide Photocatalysis Chemical Engineering(all) 0210 nano-technology photocatalysis |
| Zdroj: | Chemsuschem ChemSusChem |
| ISSN: | 1864-564X 1864-5631 |
| Popis: | Unprecedented metal‐free photocatalytic CO2 conversion to CO (up to 228±48 μmol g−1 h−1) was displayed by TiO2@IL hybrid photocatalysts prepared by simple impregnation of commercially available P25‐titanium dioxide with imidazolium‐based ionic liquids (ILs). The high activity of TiO2@IL hybrid photocatalysts was mainly associated to (i) TiO2@IL red shift compared to the pure TiO2 absorption, and thus a modification of the TiO2 surface electronic structure; (ii) TiO2 with IL bearing imidazolate anions lowered the CO2 activation energy barrier. The reaction mechanism was postulated to occur via CO2 photoreduction to formate species by the imidazole/imidazole radical redox pair, yielding CO and water. Hybrid theory: An effective method to prepare TiO2@IL semiconductor‐liquid junctions for CO2 photo‐conversion is developed. The ionic liquid (IL) plays a dual role by inducing a shift of the valence band with simultaneously decreasing the band gap as well as continuous generation of formate radicals, which suggests a decrease of CO2 activation energy barrier and thus improves the catalyst performance (yield and selectivity to CO). |
| Databáze: | OpenAIRE |
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