Excitonic Au₄Ru₂(PPh₃)₂(SC₂H₄Ph)₈ cluster for light-driven dinitrogen fixation

Area of Science:

• Materials Science
• Photocatalysis
• Nanotechnology

Background:

• Metal nanoparticles enhance photochemistry via plasmon-induced charge transfer.
• Molecular-like metal clusters struggle with light harvesting and electron/hole pair dynamics.

Purpose of the Study:

• To develop a new solar energy conversion paradigm using atomically precise metal clusters.
• To investigate light harvesting and charge separation in Au4Ru2 clusters for photocatalysis.

Main Methods:

• Utilized an atomically precise Au4Ru2 cluster supported on TiO2 with oxygen vacancies.
• Investigated direct electron-hole pair generation and charge transfer dynamics.
• Examined the role of Ru atoms in electron injection for N2 activation.

Main Results:

• Achieved direct electron-hole pair generation from excited Au4Ru2 clusters and TiO2 support.
• Demonstrated photogenerated electron transfer to Ru atoms within the cluster.
• Observed efficient N2 activation and fixation due to cooperative effects.

Conclusions:

• Atomically precise Au4Ru2 clusters on TiO2 offer a novel approach for solar energy conversion.
• The catalyst design enables efficient charge separation and utilization for N2 fixation.
• This work advances photocatalytic applications of molecular-like metal clusters.