Pivotal Role of Holes in Photocatalytic CO 2 Reduction on TiO 2
| العنوان: | Pivotal Role of Holes in Photocatalytic CO 2 Reduction on TiO 2 |
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| المؤلفون: | Martin Dilla, Jennifer Strunk, Tim Peppel, Nikolaos G. Moustakas, Felix Lorenz |
| المصدر: | Chemistry – A European Journal. 27:17213-17219 |
| بيانات النشر: | Wiley, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Reduction (complexity), Reaction mechanism, Half-reaction, Chemistry, Alcohol oxidation, Organic Chemistry, Photocatalysis, Water splitting, General Chemistry, Heterogeneous catalysis, Photochemistry, Redox, Catalysis |
| الوصف: | Evidence is provided that in a gas-solid photocatalytic reaction the removal of photogenerated holes from a titania (TiO2 ) photocatalyst is always detrimental for photocatalytic CO2 reduction. The coupling of the reaction to a sacrificial oxidation reaction hinders or entirely prohibits the formation of CH4 as a reduction product. This agrees with earlier work in which the detrimental effect of oxygen-evolving cocatalysts was demonstrated. Photocatalytic alcohol oxidation or even overall water splitting proceeds in these reaction systems, but carbon-containing products from CO2 reduction are no longer observed. H2 addition is also detrimental, either because it scavenges holes or because it is not an efficient proton donor on TiO2 . The results are discussed in light of previously suggested reaction mechanisms for photocatalytic CO2 reduction. The formation of CH4 from CO2 is likely not a linear sequence of reduction steps but includes oxidative elementary steps. Furthermore, new hypotheses on the origin of the required protons are suggested. |
| تدمد: | 1521-3765 0947-6539 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::55653e799c798e0ccf1a856a73ff583f https://doi.org/10.1002/chem.202103070 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........55653e799c798e0ccf1a856a73ff583f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15213765 09476539 |
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