| Autor: |
Bhosale, Sumit S., Kharade, Aparna K., Jokar, Efat, Fathi, Amir, Chang, Sue-min, Diau, Eric Wei-Guang |
| Zdroj: |
Journal of the American Chemical Society; December 2019, Vol. 141 Issue: 51 p20434-20442, 9p |
| Abstrakt: |
We report here a series of nontoxic and stable bismuth-based perovskite nanocrystals (PeNCs) with applications for photocatalytic reduction of carbon dioxide to methane and carbon monoxide. Three bismuth-based PeNCs of general chemical formulas A3Bi2I9, in which cation A+= Rb+or Cs+or CH3NH3+(MA+), were synthesized with a novel ultrasonication top-down method. PeNC of Cs3Bi2I9had the best photocatalytic activity for the reduction of CO2at the gas–solid interface with formation yields 14.9 μmol g–1of methane and 77.6 μmol g–1of CO, representing a much more effective catalyst than TiO2(P25) under the same experimental conditions. The products of the photocatalytic reactions were analyzed using a gas chromatograph coupled with a mass spectrometer. According to electron paramagnetic resonance and diffuse-reflectance infrared spectra, we propose a reaction mechanism for photoreduction of CO2via Bi-based PeNC photocatalysts to form CO, CH4, and other possible side products. |
| Databáze: |
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