Photoelectrochemical, photocatalytic and electrocatalytic behavior of titania films modified by nitrogen and platinum species
| Autor: | Ilkka Tittonen, Anna Eremenko, V. S. Vorobets, D. V. Ihnatiuk, N. P. Smirnova, G. Kolbasov, O. Linnik, Kamila Kočí, Marcel Šihor, Camilla Tossi |
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| Přispěvatelé: | Department of Electronics and Nanoengineering, Vernadsky Institute General and Inorganic Chemistry, VŠB – Technical University of Ostrava, National Academy of Sciences of Ukraine, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Band gap Materials Science (miscellaneous) Nanochemistry chemistry.chemical_element Quantum yield 02 engineering and technology Electronic structure 010402 general chemistry Photochemistry 01 natural sciences Electrocatalytic oxygen and hydrogen evolution Photocatalytic NO decomposition Pt ions Electrical and Electronic Engineering Physical and Theoretical Chemistry Titania films Doping Oxygen evolution Nitrogen incorporation Cell Biology 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences chemistry Photocatalysis 0210 nano-technology Platinum Biotechnology |
| Zdroj: | Applied Nanoscience. 12:565-577 |
| ISSN: | 2190-5517 2190-5509 |
| Popis: | Co-doping of titania by N and Pt species was employed to tune the electronic structure and enhance the electrocatalytic and photocatalytic activity of the films. Herein, the different approaches of synthesis procedure of Pt- and Pt,N–TiO2 films were used to investigate their effect on the platinum oxidation states. The resulting different species of Pt led to the changes in the electronic structure of TiO2, with consequent bandgap narrowing, anodic shift of the flat band potential, and cathodic shift of the valence band The quantum yield efficiency was correlated with Pt0 atomic content and the relative atomic content of Ptn+–O–Ti fragments, whereas its decrease for some samples can be caused by the presence of N and Ptn+. The highest response for N2O photocatalytic decomposition was observed over Pt,N–TiO2 films. The presence of metal and non-metal species in TiO2 structure resulted in synergistic effect including (1) inhibition of recombination of the electrons and holes and (2) narrowing of the bandgap. Electrocatalytic properties in hydrogen and oxygen evolution reactions were improved by Pt doping. The formed Pt2+–O–Ti bonds rather than Pt nanoparticles are suggested to be responsible for the highest electrocatalytic activity. The additional UV exposure of the electrodes led to Pt NPs aggregation as a result of photodeposition of Pt ions. The mechanism of the Pt2+ photoreduction in TiO2 structure is proposed. |
| Databáze: | OpenAIRE |
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