Bioinspired Polyoxo-titanium Cluster for Greatly Enhanced Solar-Driven CO₂ Reduction

Area of Science:

• Catalysis
• Materials Science
• Biomimetic Chemistry

Background:

• Developing artificial enzymes with high catalytic activity is challenging.
• Discrete titanium-oxo clusters can mimic natural enzyme active sites.
• Understanding structural determinants is key for optimizing catalysis.

Purpose of the Study:

• To precisely tailor a self-assembled Ti4Mn3-cluster for photocatalytic CO2 reduction.
• To investigate the structural and chemical factors governing selective CO evolution.
• To provide a molecular-scale model for artificial enzyme design in CO2 photoreduction.

Main Methods:

• Precise structural tailoring of a self-assembled tetrahedral Ti4Mn3-cluster.
• Photocatalytic CO2 reduction experiments.
• Theoretical simulations to analyze reaction mechanisms and active sites.

Main Results:

• The Ti4Mn3-cluster demonstrated high catalytic performance for CO2 reduction.
• Selective evolution of carbon monoxide (CO) was achieved.
• Synergy between active Mn sites and the microenvironment enhanced catalytic activity.
• Reduced reaction energy barriers and moderate CO adsorption strength favored CO selectivity.

Conclusions:

• The Ti4Mn3-cluster serves as an effective artificial enzyme for CO2 photoreduction.
• Structural and electronic properties of the cluster dictate selective CO evolution.
• This work provides a precise molecular model for designing artificial enzymes for CO2 conversion.