Artículo
Potassium and Water Coadsorption on TiO2(110): OH-Induced Anchoring of Potassium and the Generation of Single-Site Catalysts
Autor/es | Grinter, David C.
Rodríguez Remesal, Elena Luo, Si Evans, Jaime Senanayake, Sanjaya D. Stacchiola, Dario J. Graciani Alonso, Jesús Fernández Sanz, Javier Rodriguez, José A. |
Departamento | Universidad de Sevilla. Departamento de Química Física |
Fecha de publicación | 2016 |
Fecha de depósito | 2022-06-02 |
Publicado en |
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Resumen | Potassium deposition on TiO2(110) results in reduction of the substrate and formation of loosely bound potassium species that can move easily on the oxide surface to promote catalytic activity. The results of density ... Potassium deposition on TiO2(110) results in reduction of the substrate and formation of loosely bound potassium species that can move easily on the oxide surface to promote catalytic activity. The results of density functional calculations predict a large adsorption energy (∼3.2 eV) with a small barrier (∼0.25 eV) for diffusion on the oxide surface. In scanning tunneling microscopy images, the adsorbed alkali atoms lose their mobility when in contact with surface OH groups. Furthermore, K adatoms facilitate the dissociation of water on the titania surface. The K-(OH) species generated are good sites for the binding of gold clusters on the TiO2(110) surface, producing Au/K/TiO2(110) systems with high activity for the water-gas shift. |
Agencias financiadoras | Department of Energy. United States Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Identificador del proyecto | DE-SC0012704
CTQ2015-64669- P P12-FQM-1595 |
Cita | Grinter, D.C., Rodríguez Remesal, E., Luo, S., Evans, J., Senanayake, S.D., Stacchiola, D.J.,...,Rodriguez, J.A. (2016). Potassium and Water Coadsorption on TiO2(110): OH-Induced Anchoring of Potassium and the Generation of Single-Site Catalysts. Journal of Physical Chemistry Letters, 7 (19), 3866-3872. |
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