Enhancing CO₂ to Alcohol Conversion: Powerful Photocatalysts Based on TiO₂-Cu(I)-Iodine-Pyridine One-Dimensional...

Area of Science:

• Materials Science
• Catalysis
• Environmental Chemistry

Background:

• Coordination polymers (CPs) offer tunable properties for environmental catalysis.
• Existing photocatalytic systems for CO2 reduction face challenges with selectivity and stability.

Purpose of the Study:

• To synthesize and characterize novel 1D Cu(I)-iodide-pyridine based CPs.
• To investigate the photocatalytic performance of these CPs, combined with TiO2, for CO2 reduction to alcohols.
• To optimize the photocatalyst composition for enhanced efficiency and stability.

Main Methods:

• One-step, room-temperature synthesis of five 1D Cu(I)-iodide-pyridine CPs ([CuI(L)]n).
• Heterogeneous photocatalysis using TiO2 and varying CP proportions for CO2 photoreduction.
• Characterization using adsorption experiments and Density Functional Theory (DFT) calculations.

Main Results:

• Synthesized five novel 1D CPs with band gap energies around 3 eV.
• Identified TiO2@5%CP4 as the optimal mixture, achieving selective methanol production of 894 μg·g cat -1·h -1.
• Demonstrated superior performance compared to TiO2@3%CuO (318 μg·g cat -1·h -1) and maintained stability over 10 hours.

Conclusions:

• The amine substituent in CP4 enhances chemical stability and CO2 interaction, leading to improved photocatalytic activity.
• The optimized TiO2@5%CP4 system represents a highly efficient and stable heterogeneous photocatalyst for CO2 conversion to methanol.
• This study highlights the potential of tailored coordination polymers in addressing environmental challenges through advanced catalysis.