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Conversion of CO2 into Value-Added Products by using Nano-Structured Photoelectrocatalysts

Mansouri, Mahdi | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58731 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Rashidzadeh, Mehdi; Sarlak, Nahid
  7. Abstract:
  8. In this study, an efficient and cost-effective ternary Cu2O/r-GO/GQD photoelectrocatalysts was synthesized for the CO2 reduction reaction (CO2RR) using a simple and economical fabrication method. The primary objective was to overcome the inherent instability of Cu2O and enhance the selectivity toward multi-carbon products. The results demonstrate that the integration of reduced graphene oxide (r-GO) and graphene quantum dots (GQD) into the cuprous oxide structure narrows the energy bandgap from2.101eV to 1.921eV while significantly enhancing electrical conductivity. The optimized catalyst (1 wt% r-GO and 3.5% GQD) exhibited a current density of -8.035 mA/cm^2 at -1.6 V and -1.747 mA/cm^2 at -1V vs. Ag/AgCl, reflecting a 0.515 V improvement in onset potential compared to pure Cu2O. Stability tests over 6 hours revealed that the ternary composite maintained high durability with an activity loss of only 22.32%, a significant improvement over the 82.57% degradation observed in pure Cu2O. This enhancement is attributed to the synergistic effect of the r-GO/GQD protective layer in preventing photocorrosion and charge recombination. Finally, the catalyst achieved a total Faradaic efficiency of 81.9%, with a 69.75%selectivity toward high-value C3 and C4 products, including 1-propanol, acetone, and isobutanol, highlighting its potential for the production of long-chain alcohols
  9. Keywords:
  10. Carbon Dioxide Reduction ; Reduced Graphene Oxide ; Graphene Quantum Dots (GQDs) ; photoelectrocatalytic Activity ; Optical Stability ; Multi-Carbon Products

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