Dynamic Electron-Hole Shuttle at Atomic Interfaces for Solar-Driven H₂O₂ and Benzaldehyde Coproduction

Area of Science:

• Materials Science
• Photocatalysis
• Solar Energy Conversion

Background:

• Solar energy conversion requires efficient spatial separation of redox processes.
• Conventional photocatalysts suffer from slow charge dynamics and recombination.
• Developing new materials for simultaneous chemical production is crucial.

Purpose of the Study:

• To propose an atomic-level interfacial shuttle mechanism for enhanced photocatalysis.
• To couple dynamic electron-hole separation with redox cycling in a novel material.
• To achieve efficient solar-driven production of value-added chemicals.

Main Methods:

• Synthesis of sub-nanometer gold cluster-anchored nickel manganite (H-NiMn2O4-β/Au0.5 NCs).
• Ultrafast transient absorption spectroscopy to study electron transfer dynamics.
• Characterization of catalytic performance for oxygen reduction and benzyl alcohol photooxidation.

Main Results:

• An atomic-level interfacial shuttle mechanism was observed, with electron transfer occurring within 3.06 ps.
• Charge kinetics were accelerated 22.16-fold via an Au-O-Ni interface and Ni3+/Ni2+ redox cycling.
• Efficient production of H2O2 (1.00 mmol g-1 h-1) and benzaldehyde (14.59 mmol g-1 h-1) was achieved.

Conclusions:

• The proposed mechanism enables dynamic dual-site catalysis for solar-driven redox transformations.
• Atomic-level interfacial charge management is key for efficient photocatalyst design.
• This work offers new insights into harnessing solar energy for chemical synthesis.