Événement

CO2 conversion to oxygenate fuels using nanocomposite photocatalysts

EPFL Valais Wallis

Je, le 16.05.2019, 10:30 - 11:30

As we know, conversion of CO2 to oxygenate fuels in the presence of photocatalysts is a promising route for sequestration of environmental concern (increasing the amount of CO2) and depletion of fossil fuels and high demand for energy. So far in this field, we have worked under two nanocomposite systems including CNT/ZnO-CuO [1] and Pd/TiO2-Fe2O3 [2]. CNT/ZnO-CuO as a p-n junction system applied as an efficient photocatalyst for photochemical conversion of CO2 to ethanol, oxalic acid and formaldehyde. For each photosynthetic product, a reaction scheme was proposed on the basis of physicochemical phenomena. In the second work, Pd/TiO2-Fe2O3 was employed in the CO2 photoreduction (hydrogenation) process and various oxygenate (C/H/O) products [including ethanol, methanol and formaldehyde as well as oxalic, acetic and formic acids] were synthesized in the reaction medium. After that, through photoelectrochemical studies of the solar-energy-materials, the photon-to-electron conversion ability of the photocatalysts was examined. Finally, the matter of CO2 photoconversion into oxygenate fuels/chemicals was explained in detail from photoelectrochemical [semiconductor band structure and redox potential] as well as mechanistic perspectives. Our present study focus on CO2 photoreduction under CNT/Fe2O3/NiO nanocomposite, this semiconductor is mesoporous and a p-n junction system, which we predict that in the presence of it, the charge recombination will reduce and cause a conspicuous increase in the photocurrent and an obvious increment in the total yield of the photosynthesized products. Finally we are going to analysis the products and propose a mechanism for various products being produced at a fixed reaction period. My further works include photo conversion of CO2 using efficient photocatalyst (high surface area, mesoporous, nanostructured with high absorbance for CO2 and visible light photocurrent and low impedance from oxides group including C, N, Ni Co elements) and apply it for photoconversion of CO2 and finally analysis the product in both gas and liquid phase. 
 
References:
[1]  M. Lashgari, S. Soodi, P. Zeinalkhani, “Photocatalytic back-conversion of CO2 into oxygenate fuels using an efficient ZnO/CuO/carbon nanotube solar-energy-material: Artificial photosynthesis”, Journal of CO2. Utilization, vol.18, pp. 89-97, 2017
[2]  M. Lashgari, S.Soodi, “Photocatalytic conversion of CO2 into oxygenate fuels/chemicals using efficient, eco-friendly, nanostructured solar-energy materials”, Journal of nanoscience and nanotechnology, 2018 (submitted)

Source du texte: https://memento.epfl.ch/event/co2-conversion-to-oxygenate-fuels-using-nanocompos/

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Intervenants

  • Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
    Sanaz Soodi

Organisateur

Domaine

Sciences exactes et naturelles
  • Chimie

Type d'événement: Conférence

Public cible: Professionnel

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EPFL Valais Wallis - Salle de Conférence : Tseuzier

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