Weak Bimetal Coupling-Assisted MN₄ Catalyst for Enhanced Carbon Dioxide Reduction Reaction

Area of Science:

• Catalysis
• Materials Science
• Computational Chemistry

Background:

• Multimetal catalysts are crucial for CO2 capture and conversion into valuable chemicals.
• Heterobimetallic catalysts offer tunable properties for enhanced catalytic activity.

Purpose of the Study:

• To investigate heterobimetallic catalysts for CO2 reduction reactions (CO2RR) using relativistic density functional theory (DFT).
• To identify highly efficient catalysts for CO2 conversion and elucidate their reaction mechanisms.

Main Methods:

• Exploitation of heterobimetallic catalysts (MiMo)L with an octadentate Pacman-like polypyrrolic ligand (H4L).
• Utilized relativistic density functional theory (DFT) to study CO2 adsorption and reduction pathways.
• Investigated various metal ion combinations (Mo, W, Nd, U) within the ligand structure.

Main Results:

• Identified energetically stable CO2 adsorption modes: -OCO, -OOC, and -(OCO)2.
• The (UiMoo)L catalyst demonstrated the highest energy release and favored CO production during CO2RR.
• Attributed high efficiency to uranium's size compatibility with the ligand and optimized electron density manipulation.

Conclusions:

• Heterobimetallic catalysts, particularly (UiMoo)L, show significant promise for efficient CO2 capture and conversion.
• The study provides a mechanistic understanding of synergistic CO2 capture and reduction by heterobimetals.
• This work serves as a reference for designing complex heterogeneous catalysts.