Loading...

Photoelectrocatalytic Performance of Mesoporous TiO2 Nanostructures Decorated with Cu-Ag-Zn Particles for CO2 Conversion

Adel Rastkhiz, Mahsa Sadat | 2024

0 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57101 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. The rise in carbon dioxide levels has led to the manifestation of numerous environmental challenges. Currently, the absorption and conversion of carbon dioxide into valuable fuel resources such as synthetic gas, methane, and ethylene are deemed crucial from both environmental and economic standpoints. Despite the presentation of photocatalysts such as titanium oxide and electrocatalysts such as copper, silver, and zinc, their efficiency in CO2 conversion is found to be insufficient. One potential solution to this problem is the utilization of photoelectrocatalytic CO2 recovery. In this study, the aim was to enhance the photoelectrocatalytic reduction of CO2 by designing and manufacturing suitable photoelectrocatalysts based on mesoporous titanium oxide nanostructures using chemically controlled methods. To improve photocatalytic properties, CuInS2 (CIS) nanostructures were incorporated as hybrids with titanium oxide. Following the optimization of the photocatalyst, the titanium oxide surface was coated with a three-layer organic metal framework comprising copper, silver, and zinc cores using an electrochemical method. The characteristics of the produced photoelectrocatalysts were investigated and determined through scanning electron microscopy, visible and ultraviolet spectroscopy, photoluminescence spectroscopy, nitrogen gas absorption and desorption, and X-ray diffraction. The results of the photoluminescence and amerogram tests at the OCP potential revealed that the synthesized photoelectrocatalyst, featuring a CuAgZn MOF ternary metal-organic framework coating on mesoporous titania, produced a current of 110 μA cm-2 under visible light irradiation, indicating the lowest electron-hole recombination rate among the designed electrodes. Furthermore, the selectivity of the synthesized photoelectrocatalyst with CuAgZn MOF ternary metal-organic framework coating on mesoporous titania at a potential of -0.6 relative to RHE was found to be suitable for producing synthetic gas with a Faraday efficiency of 78.3%. By increasing the potential to -1 V vs. RHE, appropriate selectivity for methane and ethylene gas production with Faraday efficiencies of 22.1% and 11.8%, respectively, was achieved. The results showed that the fabricated photoelectrocatalysts can be efficient in converting CO2 to desired products, which can be an important step towards solving environmental and economic problems related to CO2
  9. Keywords:
  10. Carbon Dioxide Reduction ; Metal-Organic Framework ; Three Layerd Composite ; Self Assembled Materials ; photoelectrocatalytic Activity ; Three layer CuAgZn Metal-Organic Framework ; Mesoporous Titanium Dioxide

 Digital Object List

 Bookmark

No TOC