Stabilizing molecular catalysts on metal oxide surfaces using molecular layer deposition for efficient water...

Area of Science:

• Heterogeneous Catalysis
• Materials Science
• Electrochemistry

Background:

• Stabilizing metal-oxide-bound molecular catalysts is crucial for their longevity and commercial application in heterogeneous catalysis.
• Dye-sensitized photoelectrochemical cells (DSPECs) face challenges with catalyst and chromophore instability in aqueous, high-pH conditions.

Purpose of the Study:

• To enhance the stability and performance of ruthenium-based catalysts (RuCat) for water oxidation using molecular layer deposition (MLD).
• To investigate the impact of MLD-deposited polyimide (PI) on catalyst stability and charge transfer efficiency in DSPECs.

Main Methods:

• Employed molecular layer deposition (MLD) to apply a polyimide (PI) layer onto porous nano-ITO surfaces.
• Utilized time-resolved photoluminescence (TRPL) and femtosecond transient absorption spectroscopy (fs-TAS) to assess catalyst performance and charge transfer.

Main Results:

• MLD-applied PI significantly improved the stability of ruthenium catalysts (RuCat) for water oxidation.
• The PI coating preserved the redox capacity of photogenerated electron-hole pairs, enhancing charge transfer efficiency.
• Demonstrated improved stabilization of surface-bound small molecules for catalytic applications.

Conclusions:

• Molecular layer deposition offers a novel and effective strategy for stabilizing molecular catalysts in demanding environments.
• This approach enhances the durability and efficiency of catalysts in dye-sensitized photoelectrochemical cells, paving the way for improved heterogeneous catalysis and commercialization.