Rapid Screening of Single-Atom Catalyst Synthesis Conditions Using ToF-SIMS and Facet-Dependent Single-Crystal...

Area of Science:

• Materials Science
• Catalysis
• Surface Science

Background:

• Single-atom catalysts (SACs) exhibit enhanced performance over nanoparticle catalysts.
• Developing SACs requires extensive optimization and specialized characterization, hindering rapid progress.

Purpose of the Study:

• To introduce a rapid and versatile method for detecting synthesis conditions of SACs.
• To elucidate the deposition mechanisms of SACs on various substrates.
• To enable faster development of next-generation SACs.

Main Methods:

• Depositing active elements (Au, Cu, Ni, Rh) on facet-specific single-crystalline substrates (CeO2, TiO2, MgO, Al2O3).
• Utilizing time-of-flight secondary ion mass spectroscopy (ToF-SIMS) to analyze deposition behaviors.
• Assessing facet-dependent deposition and identifying optimal solution-based synthesis conditions.

Main Results:

• ToF-SIMS revealed diverse deposition behaviors: single-atom site formation, cluster aggregation, or no deposition.
• Observed deposition varied based on the active element, substrate type, and substrate facet.
• The technique rapidly differentiated these outcomes across multiple material systems.

Conclusions:

• Time-of-flight secondary ion mass spectroscopy (ToF-SIMS) is a viable tool for rapid screening of SAC synthesis conditions.
• This method facilitates faster and more efficient development of advanced single-atom catalysts.
• Understanding deposition mechanisms is crucial for optimizing SAC synthesis.