Strong Interaction between Two-Unit-Cell Heterostructure Layers Realigns Defect Energy Level for Methanol...

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Photocatalytic conversion of CO2 and H2O to methanol offers a sustainable route to fuels and O2.
• Challenges include charge recombination and slow reaction kinetics, limiting efficiency.

Purpose of the Study:

• To synthesize and characterize a novel atomic-layered heterostructure for enhanced photocatalytic CO2 reduction.
• To investigate the mechanism of improved charge dynamics and reaction kinetics.

Main Methods:

• Synthesis of single-unit-cell MoS2-x and organomanganese complex (MnBO) layers.
• Fabrication of MnBO/MoS2-x heterostructures.
• Characterization of electronic interactions and photocatalytic performance.
• Outdoor solar-driven reactor measurements.

Main Results:

• The MnBO/MoS2-x heterostructure exhibited strong interfacial electron transfer via Mn-S bindings.
• Achieved a methanol yield of 1.48 mmol g-1 h-1 with 99.7% selectivity at 50 °C.
• Demonstrated a solar-to-methanol efficiency of 0.76% in outdoor tests.

Conclusions:

• The heterostructure's electronic properties enhance charge carrier lifetime and reduce activation barriers for CO2 reduction.
• This approach provides a promising pathway for efficient solar fuel production.