Synergetic Surface Sensitivity of Photoelectrochemical Water Oxidation on TiO2 (Anatase) Electrodes
| Autor: | Mathias D. Spo, Markéta Zukalová, Petr Krtil, Jan Rossmeisl, Ivano E. Castelli, Ladislav Kavan, Mariana Klementová, Katerina Macounova, Roman Nebel, Monika Klusáčková |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Ozone Materials science Oxygen evolution 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Nanocrystalline material 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound General Energy chemistry Electrode Water splitting Physical and Theoretical Chemistry 0210 nano-technology Selectivity |
| Zdroj: | The Journal of Physical Chemistry C. 121:6024-6032 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b09289 |
| Popis: | The paper compares photoelectrocatalytic activity and selectivity of nanocrystalline anatase dominated by {110}, {101}, and {001} faces in photo(electro)catalytic water splitting. Although the anodic half-reaction of water splitting—oxygen evolution—dominates the overall photoelectrochemical behavior of the photoexcited anatase, simultaneous reduction under photoelectrochemical conditions is also observed on some anatase faces. The activity of individual facets in anodic half-reaction of water splitting (oxygen evolution) increases in the order {101} < {110} < {001}. The increasing oxidation activity tracks the tendency of the surface to generate the OH• radical producing intermediates (H2O2, ozone) on the trapped hole states. The activity in reduction processes increases in the reversed order. Particularly, the reduction activity of the {101} oriented anatase can be attributed to pronounced hydrogen evolution by a charge transfer of photogenerated electrons. The observed trends agree with DFT-based model... |
| Databáze: | OpenAIRE |
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